Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Environmental impact of mineral fertilizers: possible improvements through the adoption of eco-innovations
Hasler, Kathrin - \ 2017
University. Promotor(en): Onno Omta. - Wageningen : Wageningen University - ISBN 9789463436922 - 156
environmental impact - business management - fertilizers - agricultural production - germany - milieueffect - bedrijfsmanagement - kunstmeststoffen - landbouwproductie - duitsland

Agricultural production has kept pace with the population growth (FAO, 2012). One major input for a productive agriculture are fertilizers. Despite their effect on yield and quality, they also have considerable effects on the environment leading to emission of greenhouse gases, acidification, eutrophication and use of scare resources (Ruttan, 2002; Kitzes et al., 2007). However, unlike other agricultural inputs, fertilizers cannot be substituted and a reduction in the fertilizer use can lead to major yield decreases or a production shifting to less suitable areas. By considering the above mentioned statements this thesis aims to expand the knowledge of the environmental impact of fertilizers in general and innovation supply chain thinking, knowledge exchange and innovation adoption within the fertilizer supply chain in particular with the main research question:

To what extended can the environmental impact of fertilizers be improved by accelerate the adoption and diffusion of (eco)-innovations within the fertilizer supply chain?

To answer this question, the thesis was divided into two main theoretical perspectives. The first part focuses on the environmental impact of mineral fertilizers and relevant alternatives. The second part focuses on innovation adoption and diffusion.

In these thesis LCA calculations of different fertilizer types (e.g. urea, ammonium nitrate) and production types (single nutrient fertilizers, bulk blends or complex fertilizers) try to examine the amount of emissions during fertilizer production, transportation and application. With literature data of emissions during the fertilizer production, completed with data from expert interviews along the fertilizer supply chain a holistic LCA calculation was conducted. The results showed that especially urea should be used with special care in temperate climate zone and produced with best production technologies. Additionally, the production and application of phosphorus should always be part of agricultural LCA studies, because this plant nutrient also can have effects on the results in the impact categories use of scare resources and salt water eutrophication. With an optimized fertilization strategy, the environmental burden can be reduced by up to 15%.

Chapter 3 focuses on greenhouse gas emissions. The carbon footprint, used with special care and an accurate developed framework, can be a good tool to estimate these greenhouse gas emissions (Finkbeiner, 2009; Hillier et al., 2009; Pandey et al., 2011). By calculating the carbon footprint with a basic LCA approach a scientific accepted method was used. The carbon footprint of different mineral fertilizers (urea, ammonium nitrate, calcium ammonium nitrate and urea ammonium nitrate), stabilized nitrogen fertilizers (using different inhibitors), secondary raw materials (feather meals, blood-and-bone-meals and leguminous crops meals) and a combined irrigation and fertilization were compared in order to find a more sustainable solution. Here especially the uses of a double inhibitor to delay the nitrogen transformation in the soils can have an effect on the carbon footprint results.

The second part of this thesis concentrates on the fertilizer supply chain and the adoption of eco-innovations. Eco-innovations are one option to reduce the environmental impact of fertilizers without compromising on fertilizer productivity. Although numerous eco-innovations in the domain of fertilizers are available, they have no sufficient adoption rate. Here a systematic literature review combined with the types of eco-innovations within an expanded technology acceptance model (TAM) was used to estimate the main drivers. The study distinguishes between disruptive and continuous as well as process, product and other types of innovations to get a better understanding for specific situations. The distinction between the types of innovations was made, because it was assumed that the nature of the specific innovation influences the adoption. The results lead to the assumption that disruptive innovations are mostly pushed by a high quality support and a well-functioning information flow; continuous innovations are more pushed by a good access to credits and an informative environment.

Chapter 5 tries to explaining the low adoption of eco-innovation in the German fertilizer supply chain in particular. Expert interviews along the fertilizer supply chain (researcher, producer, traders) and a detailed questionnaire with closed and open questions were used to estimate the necessity to change. Furthermore, the knowledge of different eco-innovations was used to evaluate the knowledge sharing of the fertilizer supply chain. Findings suggest that drivers for eco-innovations are perceived differently by the various actors in the fertilizer supply chain. The overall knowledge on eco-innovations decreases downstream the chain.

Lactic acid fermentation of human excreta for agricultural application
Andreev, Nadejda - \ 2017
University. Promotor(en): Piet Lens. - Leiden : CRC Press/Balkema - ISBN 9781138049895 - 207
lactic acid - manure fermentation - fermentation - fertilizers - human faeces - biochar - composting - melkzuur - mestvergisting - fermentatie - kunstmeststoffen - mensenfeces - compostering

Human excreta is a valuable fertilizer for improving soil quality and crop productivity, with a potential to replace or complement the mineral fertilizers. The main challenges related to human excreta regarding agricultural applications are microbial contamination risks, loss of nutrients, and odor issues. Fertilization by lacto-fermented faeces supplemented by biochar has benefits such as improved soil bulk density, nitrate and potassium concentrations as well as the yield and yield components of corn, compared to untreated, simple stored faeces, urine, cattle manure, and unfertilized controls. Even though the mineral fertilizer produced corn with significantly higher height and leaf length, it did not add significantly higher yields than lacto-fermented faeces supplemented by biochar. A faeces treatment process by combined lacto-fermentation with thermophilic composting and biochar supplementation had better reduction of coliforms, Escherichia coli, Enterococcus faecalis and Clostridium perfringens, and higher germination of radish and growth of tomatoes than combined lacto-fermentation with vermicomposting. Urine lacto-fermentation contributed to a pH reduction below 4, a decrease in the ammonium concentration and odor strength, as well as an increase in the germination rates compared to untreated stored urine. The results of this study provide important information that can set the basis for scaling up a sustainable technology for the treatment of source separated human excreta while improving its potential for resource recovery.

It depends: : effects of soil organic matter in aboveground-belowground interactions in agro-ecosystems
Gils, Stijn Herman van - \ 2017
University. Promotor(en): Wim van der Putten; David Kleijn. - Wageningen : Wageningen University - ISBN 9789463436526 - 176
soil organic matter - agroecosystems - aphidoidea - fertilizers - wheat - rape - crop yield - ecosystem services - nutrient availability - pest control - organic farming - organisch bodemmateriaal - agro-ecosystemen - kunstmeststoffen - tarwe - koolzaad - gewasopbrengst - ecosysteemdiensten - voedingsstoffenbeschikbaarheid - plagenbestrijding - biologische landbouw

Over the last decades agricultural production increased drastically due to the use of external inputs. However, the use of external inputs has high environmental costs and may negatively influence ecosystem processes such as pollination and pest control that underpin agricultural production. Soil organic matter has been proposed as a potential alternative to external inputs as it relates to multiple yield promoting ecosystem processes. The aim of my thesis is to assess whether and how soil organic matter content alters the effect of some ecosystem processes and external inputs on crop yield. I examined whether soil organic matter alters biomass of wheat and oilseed rape under fertilizer supply. Other biotic and abiotic factors that operate at different spatial and temporal scales are also included in some of these experiments. I found that under controlled conditions soil organic matter may reduce the positive effect of mineral fertilizer supply on crop biomass. The reduction changed with the presence or absence of a pathogenic root fungus, but not with drought stress. Moreover, soil organic matter enhances performance of aphids under controlled greenhouse conditions, but the enhancement was less than fertilizer supply. None of these controlled experiments, however, showed that soil organic matter can be an alternative to mineral fertilizer supply. Under field conditions soil organic matter did not strongly affect plant nutrient availability or performances of aphid and its natural enemies. The relation between soil organic matter and plant biomass in a greenhouse experiment did not change with organic management or the duration of it, neither did it change with pollinator visitation rate, an ecosystem process that is managed on the landscape scale. These results suggest that soil organic matter may relate to ecosystem services that influence crop yield, whereas these relations might not be significant under field conditions. Collectively, all these results suggest that the relation between soil organic matter content and ecosystem processes that benefit crop yield is highly context dependent. I propose future research may focus on (1) the quality of soil organic matter rather than the content per se and (2) the relation between soil organic matter content and crop yield under realistic conditions in a longer term.

De PerceelVerdeler: optimaal verdelen van de beschikbare mest op het melkveebedrijf
Oenema, Jouke ; Verloop, Koos ; Hilhorst, Gerjan - \ 2017
Wageningen : Wageningen UR Livestock Research (Rapport / Koeien & Kansen 78) - 25
melkvee - melkveehouderij - rundveemest - kunstmeststoffen - ruimtelijke verdeling - dairy cattle - dairy farming - cattle manure - fertilizers - spatial distribution
Effecten van het mestbeleid op landbouw en milieu : Beantwoording van de ec-postvragen in het kader van de evaluatie van de meststoffenwet
Velthof, G.L. ; Koeijer, T. ; Schröder, J.J. ; Timmerman, M. ; Hooijboer, A. ; Rozemeijer, J. ; Bruggen, C. van; Groenendijk, P. - \ 2017
Wageningen : Wageningen Environmental Research (Wageningen Environmental Research rapport 2782) - 139
kunstmeststoffen - mest - landbouw - mestbeleid - oppervlaktewater - waterkwaliteit - fertilizers - manures - agriculture - manure policy - surface water - water quality
Ex-ante-evaluatie van de mestmarkt en milieukwaliteit : evaluatie van de meststoffenwet 2016
Schoumans, O.F. ; Blokland, P.W. ; Cleij, P. ; Groenendijk, P. ; Koeijer, T.J. de; Luesink, H.H. ; Renaud, L.V. ; Roovaart, J. van den - \ 2017
Wageningen : Wageningen Environmental Research (Wageningen Environmental Research rapport 2785) - 93
kunstmeststoffen - wetgeving - mest - mestbeleid - nitraten - waterkwaliteit - oppervlaktewaterkwaliteit - fosfaten - uitspoelen - bemesting - fertilizers - legislation - manures - manure policy - nitrates - water quality - surface water quality - phosphates - leaching - fertilizer application
Voor de ex-ante-evaluatie van de meststoffenwet in 2016 is een analyse uitgevoerd van de gevolgen van drie mestbeleidscenario's voor de meststromen in de landbouw en van de milieukwaliteit.
BEN: Bedrijfsspecifieke bemesting met kunstmest stikstof : resultaten 2014 en 2015
Verloop, Koos ; Hilhorst, Gerjan ; Oenema, Jouke ; Gielen, Jaap - \ 2017
Wageningen : Wageningen UR Livestock Research (Rapport / Koeien en kansen nr. 77) - 38
melkveehouderij - bemesting - kunstmeststoffen - stikstof - graslanden - akkerbouw - wetgeving - nederland - dairy farming - fertilizer application - fertilizers - nitrogen - grasslands - arable farming - legislation - netherlands
Understanding the productivity of cassava in West Africa
Ezui, Kodjovi Senam - \ 2017
University. Promotor(en): Ken Giller, co-promotor(en): Linus Franke; A. Mando. - Wageningen : Wageningen University - ISBN 9789463430470 - 183
manihot esculenta - cassava - crop production - rainfed agriculture - drought - crop yield - water use efficiency - radiation use efficiency - fertilizers - togo - ghana - west africa - cassave - gewasproductie - regenafhankelijke landbouw - droogte - gewasopbrengst - watergebruiksrendement - stralingsbenuttigingsefficiëntie - kunstmeststoffen - west-afrika

Drought stress and sub-optimal soil fertility management are major constraints to crop production in general and to cassava (Manihot esculenta Crantz) in particular in the rain-fed cropping systems in West Africa. Cassava is an important source of calories for millions of smallholder households in sub-Sahara Africa. The prime aim of this research was to understand cassava productivity in order to contribute to improving yields, food security and farm incomes in rain-fed cassava production systems in West Africa. A long-term goal was to contribute to a decision support tool for site-specific crop and nutrient management recommendations. Firstly, we studied farmers’ perception of cassava production constraints, assessed drivers of diversity among households and analysed the suitability of farmers’ resource endowment groups to the intensification of cassava production. The results indicate that farmers perceived erratic rainfall and poor soil fertility to be prime constraints to cassava production. The agricultural potential of the area and the proximity to regional markets were major drivers for the adoption of crop intensification options including the use of mineral and organic fertilizers. While the use of mineral and organic fertilizers was common in the Maritime zone that had a low agricultural potential, storage roots yields were below the national average of 2.2 Mg dry matter per hectare, and average incomes of 0.62, 0.46 and 0.46 US$ per capita per day for the high, medium and low farmer resource groups (REGs – HRE, MRE and LRE, respectively) were below the poverty line requirement of 1.25 US$. In the high agricultural potential Plateaux zone, HRE and MRE households passed this poverty line by earning 2.58 and 2.59 US$ per capita per day, respectively, unlike the LRE households with 0.89 US$ per capita per day. Secondly, we investigated the effects of mineral fertilizer on nutrient uptake, nutrient physiological use efficiency and storage roots yields of cassava since soil fertility was a major issue across the zones. We used an approach based on the model for the Quantitative Evaluation of the Fertility of Tropical Soils (QUEFTS). This model was successfully adapted for cassava and it appropriately assessed the response of cassava to N, P and K applications, especially in years with good rainfall. Under high drought stress, the model overestimated cassava yields. Thirdly, we investigated the impact of balanced nutrition on nutrient use efficiency, yield and return on investment compared to blanket fertilizer use as commonly practiced in cassava production systems in Southern Togo, and in Southern and Northern Ghana. The balanced nutrition approach of the QUEFTS model aimed to maximize simultaneously nutrient use efficiency of N, P and K in accordance with the plant’s needs. Larger nutrient use efficiencies of 20.5 to 23.9 kg storage root dry matter (DM) per kilo crop nutrient equivalent (1kCNE of a nutrient is the quantity of that nutrient that has the same effect on yield as 1 kg of N under balanced nutrition conditions) were achieved at balanced nutrition at harvest index (HI) of 0.50 compared to 20.0 to 20.5 kg storage root DM per kilo CNE for the blanket rates recommended by national research services for cassava production. Lower benefit:cost ratios of 2.4±0.9 were obtained for the blanket fertilizer rates versus 3.8±1.1 for the balanced fertilizer rates. Our study revealed that potassium (K) was a major yield limiting factor for cassava production, especially on the Ferralsols in Southern Togo. Hence, we fourthly studied the effect of K and its interaction with nitrogen (N), phosphorus (P), and the timing of harvest on the productivity of cassava in relation to the effects of K on radiation use efficiency (RUE), light interception, water use efficiency (WUE) and water transpiration. The results suggest that K plays a leading role in RUE and WUE, while N is the leading nutrient for light interception and water transpiration. Potassium effects on RUE and WUE depended on the availability of N and harvest time. Values of RUE and WUE declined with harvest at 4, 8 and 11 months after planting. Thus, enhanced K management with sufficient supply of N during the early stage of development of cassava is needed to maximize RUE and WUE, and consequently attain larger storage root yields. Given that erratic rainfall was another major constraint to cassava production according to the results of the farm survey, and due to the inability of QUEFTS modelling to assess drought effects on cassava yield successfully, another modelling approach based on light interception and utilization (LINTUL) was used. We quantified drought impacts on yields and explored strategies to improve yields through evaluation of planting dates in Southern Togo. The evaluation of the model indicated good agreement between simulated and observed leaf area index (Normalised Root Mean Square Error - NRMSE - 17% of the average observed LAI), storage roots yields (NRMSE 5.8% of the average observed yield) and total biomass yield (NRMSE 5.8% of the average observed). Simulated yield losses due to drought ranged from 9-60% of the water-limited yields. The evaluation of planting dates from mid-January to mid-July indicated that the best planting window is around mid-February. Higher amount of cropping season rainfall was also achieved with early planting. These results contradict current practices of starting planting around mid-March to mid-April. However, the results indicate the possibility to increase cassava yields with early planting, which led to less yield losses due to drought. By contrast, late planting around June-July gave larger potential yields, and suggested these periods to be the best planting window for cassava under irrigated conditions in Southern Togo. This shows that appropriate water control and planting periods can contribute to attaining larger yields in Southern Togo. Further improvement of the LINTUL model is required towards using it to assess water-limited yield, which can be used as boundary constraint in QUEFTS to derive site-specific fertilizer requirements for enhanced cassava yield and returns on investments in West Africa.

Cadmium in soil, crops and resultant dietary exposure
Rietra, R.P.J.J. ; Mol, G. ; Rietjens, I.M.C.M. ; Römkens, P.F.A.M. - \ 2017
Wageningen : Wageningen Environmental Research (Wageningen Environmental Research rapport 2784) - 39
cadmium - soil - food intake - crops - exposure - fertilizers - food safety - toxicology - bodem - voedselopname - gewassen - blootstelling - kunstmeststoffen - voedselveiligheid - toxicologie
Agricultural intensification in Nepal, with particular reference to systems of rice intensification
Uprety, Rajendra - \ 2016
University. Promotor(en): Thomas Kuijper, co-promotor(en): Harro Maat. - Wageningen : Wageningen University - ISBN 9789462579651 - 190
rice - oryza sativa - nepal - asia - south asia - intensification - livelihoods - livelihood strategies - farming systems - farming - crop management - fertilizers - nutrients - irrigation - varieties - rijst - azië - zuid-azië - intensivering - middelen van bestaan - strategieën voor levensonderhoud - bedrijfssystemen - landbouw bedrijven - gewasteelt - kunstmeststoffen - voedingsstoffen - irrigatie - rassen (planten)

This thesis deals with agricultural intensification in Nepal. The initial focus of the study was the System of Rice Intensification (SRI), as introduced in Nepal from 2001. The multiple factors affecting SRI adoption, modification and dissemination together with the option to apply SRI in different combinations of its components result in a variety of SRI applications. For the same reason the effect of SRI on overall agricultural and livelihood development of Nepalese farmers has to be evaluated within the variety of farming systems in which it is applied.

Despite government policies to promote rice cultivation, national rice production is declining. Farmer livelihood strategies, as reflected in rice farming systems, and field management strategies were influenced by several agro-ecological and socio-economic factors. Livelihood and field management strategies of rice farmers are interconnected. In the study presented here four livelihood strategies and three kinds of field management strategies are distinguished. Two livelihood strategies can be characterized as more intensive and more productive; the other two are less intensive and less productive. Livelihood strategies are more family resource-based strategies, while farmers’ field management strategies are more context-dependent. Field management strategies were characterized by forms of nutrient management. Intensive management strategies had most similarities with SRI. But rice intensification is not achievable as a general strategy.

Government policies (fertiliser subsidies) encourage increased fertiliser use. Study results didn't show any significant effect of volume of fertilisers on rice yield but the combined use of organic manure and mineral fertilisers resulted in the highest average rice yields. Irrigation management is another important factor for rice production. Field management is influenced by the reliability of water which was better in farmers' managed irrigation system. Choice of rice varieties influenced the overall rice farming system and cropping intensity and preference of varieties for rice cultivation by scientists and by farmers were different in eastern Nepal. Most popular varieties were those not recommended by science and policy and were disseminated farmer to farmer.

The introduction of SRI in Morang district resulted in several changes in rice farming, but only part of the farmers have adopted such technologies, and adoption has been only in part of their fields. Other farmers have incorporated some SRI practices in their conventional practices. After the introduction of SRI, farmers further tested, re-packaged or hybridized SRI methods to make SRI ideas suitable for their agro-ecological and socio-economic environments. In order to reform Nepalese rice farming, we need to recognize that different farmers, with different livelihood strategies, and with access to different kinds of fields, need different forms for agricultural intensification. High-intensive farmers prefer to use modified SRI methods where there is good irrigation and drainage facilities. There are many possibilities for improvement of the existing nutrient management practices of rice farmers in Nepal. Nutrient management will be useful to increase rice production because the majority of farmers currently use fertilisers non-judiciously. The SRI-recommended practices (younger seedlings, early weeding, use of organic manure, and alternate wetting and drying (AWD) irrigation) will be useful to improve the nutrient use efficiency of rice farmers. Cost-reduction strategies and less labour-intensive cultivation practices will be appropriate options to improve existing rice farming system of Nepal. Participatory cultivar selection and dissemination will be better strategies to introduce new, promising rice cultivars among rice farmers.

Effectbeoordeling van het voorstel voor een nieuwe Europese Meststoffenverordening : analyse van de aanvoer van zware metalen de landbouwbodem en gevolgen voor vrije verhandeling van nationale meststoffen
Römkens, Paul ; Rietra, René ; Ehlert, Philip - \ 2016
Wageningen : Wageningen Environmental Research (Wageningen Environmental Research rapport 2766) - 99
kunstmeststoffen - wetgeving - dierlijke meststoffen - zware metalen - effecten - milieuwetgeving - europa - fertilizers - legislation - animal manures - heavy metals - effects - environmental legislation - europe
De Europese Commissie (COM) heeft een nieuw pakket voor de circulaire economie goedgekeurd om de overgang naar een circulaire economie in Europa te stimuleren. Oogmerk is om een stimulans en een versterking te geven aan het mondiale concurrentievermogen en duurzame economische groei en nieuwe werkgelegenheid te creëren. Het pakket stelt maatregelen voor die uitgewerkt zijn in een actieplan. Deze maatregelen sturen aan op een overgang van een lineaire economie naar een circulaire economie. Tot uitvoering van het pakket heeft COM maatregelen aangewezen. Een van de maatregelen is een herziening van de Europese meststoffenverordening (CEP, 2016) om de erkenning van organische meststoffen en op afval gebaseerde meststoffen in een geharmoniseerde markt te vergemakkelijken Deze studie onderzoekt de effecten van dit voorstel en richt zich daarbij vooral op mogelijke consequenties van de door CEP 2016 voorgestelde criteria voor meststoffen, waaronder organische en anorganische reststoffen op de gewaskwaliteit en op de belasting van de bodem met contaminanten waaronder Cadmium (Cd), Chroom (Cr), Kwik (Hg), Nikkel (Ni), Lood (Pb), en Arseen (As) en micronutriënten Koper (Cu) en Zink (Zn). Daarnaast wordt via een generieke analyse in kaart gebracht of huidige nationale meststoffen kunnen voldoen aan de door de nieuwe Europese meststoffenverordening voorgestelde eisen voor waardegevende bestanddelen en contaminanten. Tevens is onderzocht of mest en producten van mestverwerking kunnen ressorteren onder de voorgestelde CEPbepalingen (2016). Ten slotte is onderzocht of de huidige afval- en reststromen die als co-vergistingsmateriaal toegelaten zijn, aangemerkt kunnen worden als bioafval conform Richtlijn 2008/98/EG.
Selenium speciation and bioavailability in Dutch agricultural soils: the role of soil organic matter
Supriatin, Supriatin - \ 2016
University. Promotor(en): Rob Comans, co-promotor(en): Liping Weng. - Wageningen : Wageningen University - ISBN 9789462579309 - 265
agricultural soils - selenium - bioavailability - soil organic matter - grasslands - soil chemistry - fertilizers - fertilizer application - netherlands - landbouwgronden - biologische beschikbaarheid - organisch bodemmateriaal - graslanden - bodemchemie - kunstmeststoffen - bemesting - nederland

Selenium (Se) is an essential micronutrient for animals and humans. In the food chain, the intake of Se by animals and humans depends largely on Se content in plants, whereas the major source of Se in plants lies in the soil. Therefore, understanding Se bioavailability in soils for plant uptake and its controlling factors and mechanisms is important. The objective of this thesis is to study the amount, speciation, bioavailability, plant uptake and fertilization of Se in agricultural soils in the Netherlands and underlying controlling factors and mechanisms, to provide guidance for soil testing and fertilization recommendation for efficient Se management in agriculture.

The majority of agricultural soils (grassland and arable land) in the Netherlands contains low total Se (i.e. in the range of Se deficient), which is predominantly present as organic Se. Only a small fraction of total Se is present as inorganic Se (mainly as selenite) and residual Se. In this thesis, the evidences of association between Se and soil organic matter in these low Se soils have been shown. The associations include: (1) the total Se content is positively correlated to soil organic matter content; (2) the solubility and extractability of Se in soils follow the solubility and extractability of soil organic C; (3) the majority of Se present in soils is in organic form, both in the soil solution and solid phase; (4) the distributions of Se and organic C in the different fractions of solid organic matter (i.e. humic acids, hydrophobic organic neutral, hydrophilic acids) and dissolved organic matter (i.e. hydrophilic acids and fulvic acids) are comparable; and (5) the Se richness in solid and dissolved organic matter are related to properties of soil organic matter from different land uses. The relatively high soil organic matter content in these low Se soils is likely responsible for these associations.

In general, Se content in crops (e.g. grass and wheat) grown on grassland soils and arable land soils, respectively in the Netherlands is low due to low amount of bioavailable Se in the soils. Different soil parameters determine Se plant uptake in these low Se soils with predominantly organic Se, depending on the properties of Se-containing soil organic matter. The intensity parameter of Se-rich dissolved organic matter (DOM) in soil solution (i.e. Se to DOC ratio in 0.01 M CaCl2 extraction) determines Se plant uptake in soils containing Se-rich organic matter (e.g. potato arable land soils), whereas the buffer capacity of labile organic Se to supply Se-rich DOM in soil solution limits Se plant uptake in soils containing Se-poor organic matter (e.g. grassland soils). Further research is needed to confirm the generality of the conclusion above, because the two experiments were carried out under different conditions (pot experiment and field experiment), using different plant species (wheat and grass) and covering different soil types from different land uses (potato fields and grassland). Site-specific properties in the field in addition to soil parameters included in the current study may largely (> 50%) determine Se content in grass under field conditions, which is in contrast with the results of the pot experiment in which the soil parameter explains 88% of Se content in wheat shoots. In general, the content of Se-rich DOM in soils increases with the increase of soil pH (with the decrease of soil C:N ratio), and the amount of labile organic matter in soils that can resupply Se-rich DOM is determined by the amount of clay (and Fe-(hydr)oxide). NPK fertilization, as one of the external factors, can reduce Se plant uptake, especially in organic-rich soils.

Selenium (as selenate) fertilization on grassland with N plus cattle slurry or NPK application shows a positive effect to increase Se content in grass grown on different soil types with a large range of total Se, pH, clay content and organic matter content. Selenium content in grass grown on different soil types upon Se fertilization becomes more similar than before the fertilization. The results indicate that the effectiveness of Se fertilization is only weakly modified by soil properties, probably due to the high solubility of selenate in the soils. Nevertheless, the Se fertilization tends to be slightly more effective on sandy soils than on clay and organic rich soils.

This thesis has shown that the content and quality of soil organic matter play an important role in determining the amount, speciation and bioavailability of Se in low Se soils with predominantly organic Se. The results in this thesis can be used as guidance to develop soil testing and fertilization recommendation for efficient Se management, especially in low Se soils with predominantly organic Se, such as in Dutch agricultural soils.

Protocol beoordeling stoffen Meststoffenwet : versie 3.2
Commissie Deskundigen Meststoffenwet, - \ 2016
Wageningen : Wettelijke Onderzoekstaken Natuur & Milieu (WOt-technical report 71) - 70
kunstmeststoffen - afval - wetgeving - protocollen - regelingen - bijproducten - fertilizers - wastes - legislation - protocols - regulations - byproducts
The Fertiliser Act regulates the trade in and use of fertilisers in the Netherlands. Only designated fertiliserscan be traded freely. In general, the Act prohibits the use of wastes and by-products as fertilisers, assecondary raw materials for fertiliser production or for the production, via co-digestion in a biogas productionplant, of digestate destined for use as fertiliser. However, a statutory provision has been adopted thatpermits the use of approved and designated wastes and by-products as fertilisers or as secondary rawmaterials for fertiliser or digestate production. Before wastes and by-products may be designated, they arereviewed to assess their fertilisation value and any environmental risks associated with these uses. Theassessment criteria and evaluation procedures are described in detail in a protocol. The protocol alsodescribes the administrative procedure and summarises the data needed for the review and assessment
Opname van struviet als categorie in het Uitvoeringsbesluit Meststoffenwet : advies
Ehlert, P.A.I. ; Dijk, T.A. van; Oenema, O. - \ 2016
Wageningen : Wettelijke Onderzoekstaken Natuur & Milieu (WOt-technical report 69) - 92
magnesiumammoniumfosfaat - kunstmeststoffen - wetgeving - afvalwater - fosfaten - besmetters - afvalwaterbehandelingsinstallaties - magnesium ammonium phosphate - fertilizers - legislation - waste water - phosphates - contaminants - waste water treatment plants
Only products, wastes and by-products designated by the Fertiliser Act can be freely traded as fertiliser in theNetherlands. Permitted fertilisers are listed in Regulation (EC) No 2003/2003 and wastes and by-products that canbe traded as fertiliser or as secondary raw material for fertiliser production are listed in Annex Aa of the implementingregulation of the Fertiliser Act. Wastes and by-products can be used as a fertiliser or a secondary raw materialif the criteria given in the Protocol for assessing the value and risks of waste used as fertiliser are met. Struvite is amagnesium ammonium phosphate (NH4MgPO4.6H2O) and is one of the forms in which phosphate can be recoveredfrom wastewater or process water. This origin means that struvite is classified as a waste, and as it is not listed inAnnex Aa the Fertiliser Act prohibits its use as a fertiliser. This publication reports on a study to formulate criteriafor lifting this waste status in accordance with the protocol. Depending on its quality, struvite acts as a fast-releaseor slow-release fertiliser. Due to the different techniques that are available for struvite formation, the differentwaste streams – municipal wastewater, effluent from manure processing, process water from the food manufacturingindustry – and different chemical polishing treatment processes, struvite can come in a range of qualities withdifferent concentrations of contaminants and may possibly contain pathogens. For the Ministry of Economic Affairs,the Scientific Committee on the Nutrient Management Policy has prepared an advice on including struvite in theFertiliser Act, with criteria. The study was based on literature research and consultation with stakeholders. Struviteis often co-precipitated with other phosphate minerals, such as phosphates of calcium, magnesium and iron, and anumber of these phosphates are present in struvite products. The advice covers this range of recovered phosphates
Recirculatie bij snij-amaryllis (Hippeastrum) in drie teeltjaren (2013-2015) : Behoud plantgezondheid en voorkomen groeiremming bij hergebruik drainwater
Kromwijk, J.A.M. ; Burg, R. van der; Nijs, L. ; Overkleeft, J. ; Eveleens-Clark, B.A. ; Blok, C. ; Os, E.A. van; Baar, P.H. van; Grootscholten, M. ; Woets, F. - \ 2016
Bleiswijk : Wageningen UR Glastuinbouw (Rapport GTB 1398) - 88 p.
amaryllis - glastuinbouw - kasgewassen - kasproeven - teelt onder bescherming - emissie - hergebruik van water - afvalwaterbehandeling - afvalwater - recirculatiesystemen - lycorine - stikstof - voedingsstoffen - kunstmeststoffen - greenhouse horticulture - greenhouse crops - greenhouse experiments - protected cultivation - emission - water reuse - waste water treatment - waste water - recirculating systems - nitrogen - nutrients - fertilizers
In the Netherlands most crops grown in greenhouses reuse drain water. However, in the cultivation of amaryllis
cut flowers (Hippeastrum) little drainage water is being reused so far because of strong suspicions of inhibitory
substances in the drainage water. To reduce the emission of nutrients to the environment an experiment was
started on request of the amaryllis growers. In a greenhouse experiment drainage water of amaryllis was treated
with advanced oxidation and reused. This was compared with the reuse of drainage water treated with an UV
disinfector and a control treatment without the reuse of drainage water. In three years of cultivation, there was
no difference in production and no adverse effects were seen in crop growth. This research was funded by the
Dutch amaryllis growers, the ‘Topsector Tuinbouw en Uitgangsmaterialen’, the Product Board for Horticulture, the
project ‘Samenwerken aan Vaardigheden’ and Koppert.
Effect afzet mestverwerkingsproducten bij wettelijke status kunstmest of EG-meststof
Luesink, H.H. ; Postma, R. ; Smits, M.J.W. ; Schöll, L. van; Koeijer, T.J. de - \ 2016
Wageningen : LEI Wageningen UR (Rapport / LEI Wageningen UR 2016-034) - ISBN 9789462577787
regelingen - agrarisch recht - mest - kunstmeststoffen - mestverwerking - nederland - europese unie - europa - regulations - agricultural law - manures - fertilizers - manure treatment - netherlands - european union - europe
Research of the LEI Wageningen UR and NMI (Nutriënten Management Instituut) how the market for reclaimed nutrients would develop if harmonised product specifications were to apply to organic fertilisers and if substitutes for artificial fertilisers made from animal manure were to be considered legally equivalent to artificial fertiliser. The influence of the scrapping of such regulations is limited. The scale of the processing of manure into mineral concentrates will increase a little, the costs of exporting manure products will be a little lower, and the gate fees for manure processers could decline by 1-2 euros per tonne of manure (5-10%).
Fosfaatgehalte in de bodem blijft voldoende hoog : jarenlange fosfaatbemesting volgens bedrijfsspecifieke gebruiksnormen zorgt voor zes procent lagere drogestofopbrengst
Middelkoop, J.C. van; Ehlert, P.A.I. ; Regelink, I.C. - \ 2016
Veeteelt 33 (2016)8. - ISSN 0168-7565 - p. 44 - 45.
bemesting - kunstmeststoffen - fosfaat - graslanden - veldproeven - opbrengen op het land - droge stof - fertilizer application - fertilizers - phosphate - grasslands - field tests - application to land - dry matter
In Nederland is de fosfaatbemesting op grasland via gebruiksnormen beperkt tot een evenwichtsbemesting. Om de verwachte daling van de fosfaattoestand van de bodem en de grasproductie te monitoren, deed Wageningen UR vana f 1997 een veldproef.
Met scheiding minder mestafvoer en lagere kunstmestkosten
Evers, A.G. ; Galama, P.J. - \ 2016
V-focus 2016 (2016)1. - ISSN 1574-1575 - p. 38 - 39.
mestverwerking - kunstmeststoffen - agrarische bedrijfsvoering - scheiding - melkveehouderij - intensieve veehouderij - kosten-batenanalyse - kostenbeheersing - manure treatment - fertilizers - farm management - separation - dairy farming - intensive livestock farming - cost benefit analysis - cost control
Toepassen van mestscheiding kan bij melkveehouders die veel mest moeten afvoeren een hoger inkomen opleveren. Besparing op kosten voor mestafvoer is mogelijk omdat de dikke fractie meer mineralen bevat dan drijfmest. Ook blijft er meer werkzame stikstof en kali uit dierlijke mest op het bedrijf, zodat minder kunstmestaankoop nodig is. In dit artikel is voor een intensief melkveebedrijf berekend hoeveel bespaard kan worden bij verschillende scheidingsrendementen en prijzen voor mestscheiding en -afzet.
Recirculatie tijdens opkweek, koeling en afkweek van Phalaenopsis : Behoud plantgezondheid en voorkomen groeiremming bij recirculatie potorchidee
Kromwijk, J.A.M. ; Haaster, Bram van; Kongkijthavorn, Songyos ; Blok, C. ; Os, E.A. van - \ 2015
Wageningen UR Glastuinbouw (Rapport GTB 1379) - 38 p.
phalaenopsis - orchideeën als sierplanten - recirculatiesystemen - hergebruik van water - drainagewater - emissiereductie - kunstmeststoffen - glastuinbouw - ornamental orchids - recirculating systems - water reuse - drainage water - emission reduction - fertilizers - greenhouse horticulture
In the Netherlands, the government and horticultural industry have agreed to lower the emission of nutrients to the environment. To reduce the emission of fertilizers in pot orchid cultivation research into the effects of reusing drainwater (recirculation) in Phalaenopsis was conducted at Wageningen UR Greenhouse Horticulture. The first treatment aimed to lower the emission to the standard of 2018. In the second treatment the emissions were lowered even more to meet the more stringent standards after 2018. Both treatments were compared with a third treatment without reuse of drain water. Sodium and zinc content increased in both recirculation treatments. The reuse of drainage water has shown no adverse effects on plant growth or disease incidence. In all treatments, virtually no plants were lost.
De permanente groene revolutie van Swaminathan
Fresco, L.O. ; Rabbinge, R. - \ 2015
Vork 2 (2015)3. - ISSN 2352-2925 - p. 66 - 71.
green revolution - genetic engineering - human feeding - hunger - food supply - scientific research - scientists - society - fertilizers - pesticides - environmental impact - india - netherlands - potatoes - wheat - groene revolutie - genetische modificatie - humane voeding - honger - voedselvoorziening - wetenschappelijk onderzoek - wetenschappers - samenleving - kunstmeststoffen - pesticiden - milieueffect - nederland - aardappelen - tarwe
Het weekblad Time kwalificeerde hem als een van de twintig meest invloedrijke Aziaten van de twintigste eeuw: ‘The father of the Green Revolution used his skills in genetic engineering and his powers of persuasion to make famine an unfamiliar word in Asia’. Tegelijkertijd wees hij al vroeg op de gevaren van een te grote afhankelijkheid van kunstmest en bestrijdingsmiddelen en milieugevolgen daarvan. Dr. Monkombu Sambasivan Swaminathan is een fervent pleitbezorger van de Evergreen Revolution, de permanente groene revolutie. Op 7 augustus werd hij 90 jaar. Louise Fresco en Rudy Rabbinge schetsen zijn enorme betekenis voor wetenschap en samenleving.
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