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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    Soilless Cultivation Through an Intensive Crop Production Scheme. Management Strategies, Challenges and Future Directions
    Tzortzakis, Nikolaos ; Nicola, Silvana ; Savvas, Dimitrios ; Voogt, Wim - \ 2020
    Frontiers in Plant Science 11 (2020). - ISSN 1664-462X
    abiotic stress - biofortification - hydroponics - induced resistance - nutrient management
    E-learning bodem, bemesting en mestverwaarding
    Roefs, Jan ; Haan, J.J. de - \ 2020
    Nederlands Centrum voor Mestverwaarding
    circular agriculture - soil management - nutrient management - manures
    Het goud op de mesthoop
    Wolf, Pieter de - \ 2019
    circular agriculture - soil organic matter - nutrient management - nitrogen - residual streams - soil management
    Soil greenhouse gas emissions from inorganic fertilizers and recycled oil palm waste products from Indonesian oil palm plantations
    Rahman, Niharika ; Bruun, Thilde Bech ; Giller, Ken E. ; Magid, Jakob ; Ven, Gerrie W.J. van de; Neergaard, Andreas de - \ 2019
    Global change biology Bioenergy 11 (2019)9. - ISSN 1757-1693 - p. 1056 - 1074.
    methane - nitrogen fertilizer - nitrous oxide - nutrient management - organic amendment - plant residue

    A continuous rise in the global demand for palm oil has resulted in the large-scale expansion of oil palm plantations and generated environmental controversy. Efforts to increase the sustainability of oil palm cultivation include the recycling of oil mill and pruning residues in the field, but this may increase soil methane (CH4) emissions. This study reports the results of yearlong field-based measurements of soil nitrous oxide (N2O) and CH4 emissions from commercial plantations in North Sumatra, Indonesia. One experiment investigated the effects of soil-water saturation on N2O and CH4 emissions from inorganic fertilizers and organic amendments by simulating 25 mm rainfall per day for 21 days. Three additional experiments focused on emissions from (a) inorganic fertilizer (urea), (b) combination of enriched mulch with urea and (c) organic amendments (empty fruit bunches, enriched mulch and pruned oil palm fronds) applied in different doses and spatial layouts (placed in inter-row zones, piles, patches or bands) for a full year. The higher dose of urea led to a significantly higher N2O emissions with the emission factors ranging from 2.4% to 2.7% in the long-term experiment, which is considerably higher than the IPCC standard of 1%. Organic amendments were a significant source of both N2O and CH4emissions, but N2O emissions from organic amendments were 66%–86% lower than those from inorganic fertilizers. Organic amendments applied in piles emitted 63% and 71% more N2O and CH4, respectively, than when spread out. With twice the dose of organic amendments, cumulative emissions were up to three times greater. The (simulated) rainwater experiment showed that the increase in precipitation led to a significant increase in N2O emissions significantly, suggesting that the time of fertilization is a critical management option for reducing emissions. The results from this study could therefore help guide residue and nutrient management practices to reduce emissions while ensuring better nutrient recycling for sustainable oil palm production systems.

    KringloopToets: Sluiten van de nutriëntenkringloop op het niveau van Noordwest-Europa : Inhoudelijke resultaten
    Leenstra, F.R. ; Vellinga, Th.V. ; Bremmer, B. - \ 2018
    Wageningen University & Research - 4 p.
    soil management - nutrient management - circular agriculture
    KringloopToets: sluiten van de nutriëntenkringloop op het niveau van Noordwest-Europa : inhoudelijke en procesmatige rapportage
    Leenstra, Ferry ; Vellinga, Theun ; Bremmer, Bart - \ 2017
    Wageningen : Wageningen Livestock Research (Wageningen Livestock Research rapport 1019) - 47
    nutriëntenstromen - voer - diervoedering - diervoeding - recycling - noordwest-europa - nutrient flows - feeds - animal feeding - animal nutrition - recycling - northwestern europe
    The Nutrient Cycle Assessment aims at visualizing nutrient flows. In policy documents closing of nutrient cycles at the level of North Western Europe is often mentioned. Province North Brabant, farmers organisation ZLTO and NGO BMF examined together with Wageningen University & Research the effects of closing the borders of North West Europe (Benelux, France, Germany, UK) for feed ingredients and animal products. The results of this exercise were discussed in a separate session with representatives of the feed industry. This report describes the conclusions of the analysis and the lessons that can be learned from this exercise for future work with the Nutrient Cycle Assessment.
    Verkenning regionale kringlopen : sluiten van nutriëntenkringloop op het niveau van Noordwest-Europa
    Leenstra, Ferry ; Vellinga, Theun - \ 2017
    Wageningen : Wageningen Livestock Research (Wageningen Livestock Research rapport 987) - 34
    voer - voedingsstoffen - dierlijke producten - kringlopen - dierhouderij - dierlijke meststoffen - noord-brabant - noordwest-europa - feeds - nutrients - animal products - cycling - animal husbandry - animal manures - noord-brabant - northwestern europe
    Soil fertility management in organic greenhouses in Europe
    Tittatelli, Fabio ; Bath, Brigitta ; Ceglie, Francesco Giovanni ; Garcia, M.C. ; Moller, K. ; Reents, H.J. ; Vedie, Helene ; Voogt, W. - \ 2016
    [Netherlands] : BioGreenhouse - ISBN 9789462575363 - 46
    greenhouse horticulture - soil fertility - organic farming - europe - rotation - fertilizer application - nutrient management - cropping systems - glastuinbouw - bodemvruchtbaarheid - biologische landbouw - europa - rotatie - bemesting - nutrientenbeheer - teeltsystemen
    The management of soil fertility in organic greenhouse systems differs quite widely across Europe. The challenge is to identify and implement strategies which comply with the organic principles set out in (EC) Reg. 834/2007 and (EC) Reg. 889/2008 as well as supporting environmentally, socially and economically sustainable cropping systems. In this paper, written by a group of scientists of different geographical origin and with different background, the state of the art of the sector and the main characteristics of the European organic greenhouse cropping systems are described. The main bottlenecks and constraints are discussed with a particular reference to the regulatory framework in force. The most relevant issues that may influence the enforcement and future development of the sector have been identified as specific knowledge gaps. For each of them, the appropriate research needs were elaborated in a multidisciplinary perspective as forthcoming challenges for the whole sector. Although not exhaustive, given the wide heterogeneity of the implemented systems, this paper is able, for the first time, to give a structured outlook on soil fertility management in protected organic conditions on a European scale.
    NW European Policy-Science Working Group on Reducing Nutrient Emissions : mitigation options: Evaluating the impact of implementing nutrient management strategies on reducing nutrient emissions from agriculture in NW Europe
    Boekel, E.M.P.M. van - \ 2015
    Wageningen : Alterra, Wageningen-UR (Alterra-report 2670) - 113
    water quality - water management - water policy - nutrients - nutrient management - emission - agriculture - mitigation - northwestern europe - waterkwaliteit - waterbeheer - waterbeleid - voedingsstoffen - nutrientenbeheer - emissie - landbouw - mitigatie - noordwest-europa
    In the northwestern part of Europe, many surface waters suffer from eutrophication through diffuse losses of nutrients from agriculture to surface water and relatively high nitrate concentrations in groundwater in nitrate vulnerable zones. A lot of research and policy has been devised to decrease these losses. The northwestern European countries (Denmark, NW Germany, Belgium (Flanders), United Kingdom, Ireland and the Netherlands) are working together in an active policy-science working group to improve water quality by evaluating the impact of implemented nutrient management strategies. More insight into the effectiveness and cost-effectiveness of different mitigation options under specific circumstances is needed. Therefore, each country has prepared factsheets with specific information for the top six mitigation options. Based on this information, general factsheets were made to compare the effects and cost-effectiveness of mitigation options between the NW European countries. The results are presented in this report.
    Bodem Resetten: stap naar praktijktoepassing nieuwe methode van anaerobe grondontsmetting
    Runia, W.T. ; Molendijk, L.P.G. ; Visser, J.H.M. ; Regeer, H. ; Feil, H. ; Meints, H. - \ 2015
    Lelystad : PPO AGV (Rapport / PPO-AGV 648) - 45
    akkerbouw - nematoda - meloidogyne chitwoodi - ditylenchus dipsaci - globodera pallida - waardplanten - gewasbescherming - bodeminvertebraten - nederland - inventarisaties - anaërobe behandeling - biologische grondontsmetting - duurzaamheid (sustainability) - onkruiden - nutrientenbeheer - arable farming - nematoda - meloidogyne chitwoodi - ditylenchus dipsaci - globodera pallida - host plants - plant protection - soil invertebrates - netherlands - inventories - anaerobic treatment - biological soil sterilization - sustainability - weeds - nutrient management
    Door de toenemende problemen met schadelijke aaltjes in diverse teelten wordt naarstig gezocht naar alternatieve mogelijkheden om de grond te ontsmetten. Uitgangspunt van Wageningen UR en Agrifirm Plant is daarvoor een “groene” manier van grondbehandeling, die past in het algemene beleid van een duurzame gewasbescherming. Bodem Resetten is een nieuwe en unieke manier van anaerobe grondontsmetting en kan mogelijk een milieuvriendelijk en voor omwonenden veilig alternatief bieden. Er zijn voor het Bodem Resetten (BR) twee producten getest op effectiviteit: vaste Herbie® 72 en vloeibare Herbie® 87. Tevens is op zeer kleine schaal ook een plantaardige coating, als alternatief voor folie, onderzocht op gasdichtheid.
    Houtoogst en bodemvruchtbaarheid : een modelstudie naar duurzaamheid van houtoogst op Nederlandse bosgroeiplaatsen
    Bonten, L.T.C. ; Bijlsma, R.J. ; Delft, S.P.J. van; Jong, J.J. de; Spijker, J.H. ; Vries, W. de - \ 2015
    Wageningen : Alterra, Wageningen-UR (Alterra-rapport 2618)
    bosecologie - bodemvruchtbaarheid - bepaling van groeiplaatshoedanigheden - opbrengstregeling - nutrientenbeheer - bodemchemie - forest ecology - soil fertility - site class assessment - yield regulation - nutrient management - soil chemistry
    Dit rapport brengt met een modelstudie de duurzaamheid van houtoogstscenario’s in beeld ten aanzien van nutriëntenbalansen op verschillende Nederlandse bosgroeiplaatsen. Tegelijkertijd geeft de studie aan waar (nog aanzienlijke) onzekerheden liggen bij de vertaling naar een adviessysteem voor houtoogst. De voor houtoogst relevante groeiplaatsen zijn gekarakteriseerd met 11 typen. Voor elk van deze groeiplaatstypen is met een model nagegaan in welke mate combinaties van boomsoort, groeiklasse (groeiverwachting) en oogstscenario leiden tot een negatieve nutriëntenbalans voor calcium (Ca), magnesium (Mg), kalium (K) en fosfor (P). Ook is nagegaan hoe snel de bosbodem wordt uitgeput.
    Stochastic uncertainty and sensitivities of nitrogen flows on diary farms in The Netherlands
    Oenema, J. ; Burgers, S. ; Keulen, H. van; Ittersum, M.K. van - \ 2015
    Agricultural Systems 137 (2015). - ISSN 0308-521X - p. 126 - 138.
    manure management-practices - nutrient management - use efficiency - systems - balances - budgets - losses - europe
    Nutrient management decisions and environmental policy making must be based on sound data and proper analysis. Annual data collection and monitoring of farm and nutrient performance are wrought with uncertainties. Such uncertainties need to be addressed as it may lead to ambiguities and wrong conclusions. We developed an input-output N balance model to describe and quantify N flows in dairy farming systems. Input for this model was based on monitored data for one year (2005) from one experimental (detailed monitoring) and 14 pilot commercial dairy farms (less detailed monitoring). A Monte Carlo approach was used to quantify effects of uncertainty of input data on annual farm N surplus, soil surface N surplus and N intake during grazing, followed by a sensitivity analysis to apportion the different sources of uncertainty. Uncertainties in data input were described with probability density functions. Farm N surplus of the 14 pilot farms ranged between 81 and 294¿kg¿ha-1, soil surface N surplus between 35 and 256¿kg¿ha-1, and N intake during grazing between 27 and 108¿kg¿ha-1. The uncertainties of N flows – both relative and absolute – increased from farm N surplus (CV¿=¿8%; SD¿=¿15¿kg¿N¿ha-1) to soil surface N surplus (CV¿=¿12%; SD¿=¿16¿kg¿N¿ha-1) to N intake during grazing (CV¿=¿49%; SD¿=¿28¿kg¿N¿ha-1). Variation in uncertainty among farms in farm and soil surface N surplus and N intake during grazing was substantial and was related to the farm structure and farm characteristics such as production intensity, N fixation by clover and annual changes in stocks of roughage and manure. We found that a monitoring program based on more measurements instead of estimates and/or fixed rate values from literature will not always result in a better quantification of farm and soil surface N surplus on clover-based dairy farms. However, on farms with no N fixation, an intensive monitoring program reduced the uncertainty in farm and soil surface N surplus by 23% and the uncertainty of N intake during grazing was reduced by more than 30%. Knowledge about uncertainties of N flows is necessary to correctly interpret the N performance on dairy farms and its evolution through time. A first step is to get insights into the most uncertain N flows on a dairy farm. The next step, where possible, is to improve the estimation of the most uncertain N flows. Based on the insights from this study, these steps will underpin the validation of trends in N performance and justify decisions in environmental policy making and/or decisions for making on-farm improvements.
    Groenbemester noodzakelijk voor topopbrengst : stappenplan maïsteelt deel 2
    Groten, J.A.M. - \ 2015
    Grondig : vakblad voor de cumelasector, specialisten in groen, grond en infra (2015)2. - ISSN 2210-3260 - p. 54 - 56.
    akkerbouw - maïs - bemesting - groenbemesters - nutrientenbeheer - precisielandbouw - geografische informatiesystemen - onkruidbestrijding - arable farming - maize - fertilizer application - green manures - nutrient management - precision agriculture - geographical information systems - weed control
    Nu voor de maïsteelt steeds minder mest en kunstmest beschikbaar zijn, is het noodzakelijk om zoveel mogelijk uit de natuur te halen. Het is een manier om toch in de buurt van de maximale opbrengst te komen. Een goede groenbemester speelt daarin een essentiële rol. In deel 2 van het stappenplan maïsteelt alles over het telen van een goede groenbemester.
    Ziektebeheersing substraatloze teeltsystemen : naar een robuust systeem tegen ziekten en plagen
    Stijger, C.C.M.M. ; Janse, J. ; Vermeulen, T. ; Weel, P.A. van - \ 2014
    Bleiswijk : Wageningen UR Glastuinbouw (Rapport GTB 1335) - 45
    bladgroenten - slasoorten - teeltsystemen - hydrocultuur - vloeibare kunstmeststoffen - ziektebestrijding - nutrientenbeheer - risicofactoren - monitoring - reductie - plagenbestrijding - leafy vegetables - lettuces - cropping systems - hydroponics - liquid fertilizers - disease control - nutrient management - risk factors - monitoring - reduction - pest control
    De belangrijkste kennislacune rond substraatloze teeltsystemen is het beheersen van de kwaliteit van het voedingswater. Hoge kwaliteit vergt, naast een goede balans van nutriënten, vooral het voorkomen van ziekte- en plaagontwikkeling. Het voorkomen of beheersen van de verspreiding speelt daarbij een grote rol. De bedrijfszekerheid van nieuwe teeltsystemen staat of valt bij de beheersbaarheid van ziekten en plagen. De ziekte- en plaagbeheersing in substraatloze systemen volgen andere principes dan de reguliere (steenwol of grondgebonden) teelt. De gebruikte watervolumes zijn enorm, fysieke barrières ontbreken maar ook een buffer/balans ontbreekt waarmee een direct effect is te benoemen op het risico op ziekte( en plaagverspreiding. De ziekte- en plaagrisico’s bepalen het gebruik van (chemische) gewasbeschermingsmiddelen, spui, maar bovenal het succes van een substraatloze teelt. Het verlagen van het risico op ziekten en plagen en het voorkomen, monitoren en vertragen van een snelle verspreiding daarvan is onderwerp van dit project. Het onderzoek waarin in dit verslag wordt gerapporteerd heeft zich gericht op de kennisvragen rond ziektebeheersing en de ontwikkeling van indicatoren en teeltstrategieën ter voorkoming van ziekten in een robuust substraatloos (water) systeem. Behalve dat een chemische aanpak vanwege het gebruik van grote volumes water in deze nieuwe teeltsystemen vaak geen economisch haalbare oplossing is, is een chemische aanpak voor ziekte- en plaagproblematiek bovendien geen toekomstgerichte oplossing. Daarom heeft het onderzoek zich gericht, naast het voorkomen van aantastingen, vooral op mogelijke natuurlijke en fysische bestrijdingsmaatregelen. In het onderzoek dat heeft gelopen van juni 2013 tot en met mei 2014 zijn in totaal vier achtereenvolgende slateelten uitgevoerd.
    Mitigation of nitrous oxide emissions from food production in China
    Ma, L. ; Velthof, G.L. ; Kroeze, C. ; Ju, X. ; Hu, C. ; Oenema, O. ; Zhang, F. - \ 2014
    Current Opinion in Environmental Sustainability 9-10 (2014). - ISSN 1877-3435 - p. 82 - 89.
    greenhouse-gas emissions - reactive nitrogen - environmental-quality - nutrient management - climate-change - n2o emissions - croplands - chain - phosphorus - security
    We evaluate nitrogen (N) management options to mitigate nitrous oxide (N2O) emissions from food production in China. First, we review approaches to quantify N2O emissions. We argue that long-term monitoring of N2O measurements at different sites is needed to improve emission estimates. Next, past trends in N2O emissions from food production are evaluated showing that N2O emissions more than doubled in China between 1980 and 2005. In the future, N2O emissions may continue to increase. However, combinations of diet changes, balanced fertilization and integrated nutrient management options can reduce N2O emission by almost two-thirds, relative to a business-as-usual scenario. We argue that further research and policy instruments for N2O reductions are needed on managing N in the food chain in order to ensure N2O emission reduction.
    Nutrient use efficiency in the food chain of China
    Ma, L. - \ 2014
    Wageningen University. Promotor(en): Oene Oenema, co-promotor(en): Gerard Velthof; F. Zhang. - Wageningen : Wageningen University - ISBN 9789461738448 - 193
    stikstofmeststoffen - fosformeststoffen - voedselketens - voedselzekerheid - kosten voor voedsel - milieueffect - nutrientenbeheer - kringlopen - nutriëntengebruiksefficiëntie - china - nitrogen fertilizers - phosphorus fertilizers - food chains - food security - food costs - environmental impact - nutrient management - cycling - nutrient use efficiency - china

    Key words: Nitrogen, phosphorus, food chain, food pyramid, food system, food security, food cost, environmental impacts, nutrient cycling, nutrient management

    Nitrogen (N) and phosphorus (P) fertilizer applications have greatly contributed to the increased global food production during the last decades, but have also contributed to decreasing N and P use efficiencies (NUE and PUE) in the food production - consumption chain, and to increased N and P losses to air and water, with major ecological implications.

    The aim of this thesis is to increase the quantitative understanding of N and P flows and losses in the food production - consumption chain in China at regional level in the past 30 years and to develop strategies to increase NUE and PUE in the food chain. A novel ‘food chain’ approach and the NUFER model were developed to analyse N and P flows in crop production, animal production, food processing and retail, and households. Data were derived from statistical sources, literature and field surveys.

    Between 1980 and 2005, NUE and PUE decreased in crop production, increased in the animal production and decreased in the whole food chain. Total N losses to water and atmosphere almost tripled between 1980 (14.3 Tg) and 2005 (42.8 Tg), and P losses to water systems increased from 0.5 to 3.0 Tg. There were significant regional differences in NUE, PUE, and N and P losses; regions with high N and P losses were in Beijing and Tianjin metropolitans, Pearl River Delta, and Yangzi River Delta. Urban expansion is a major driving force for change; total N losses increased 2.9 folds, and P losses increased even 37 folds during the development of Beijing metropolitan, between 1978 and 2008. Scenario analyses indicated that implementation of a package of integrated nutrient management measures, combined with diet changes and increased imports of animal food and feed, are the most effective management options for increasing NUE and PUE, and for decreasing N and P losses.

    Application of the food chain approach and the NUFER model can help policy makers in China to plan food production - consumption chains, and thereby manage N and P flows in this chain at regional level.

    Nitrogen use and food production in European regions from a global perspective
    Grinsven, H.J.M. van; Spiertz, J.H.J. ; Westhoek, H.J. ; Bouwman, A.F. ; Erisman, J.W. - \ 2014
    The Journal of Agricultural Science 152 (2014)S1. - ISSN 0021-8596 - p. 9 - 19.
    greenhouse-gas emissions - use efficiency - management-practices - nutrient management - climate-change - wheat yield - dairy farms - land-use - agriculture - systems
    Current production systems for crops, meat, dairy and bioenergy in the European Union (EU) rely strongly on the external input of nitrogen (N). These systems show a high productivity per unit of land. However, the drawback is a complex web of N pollution problems contributing in a major way to degradation of ecosystems. European Union Directives and national policies have improved nutrient management and reduced fertilizer N use in most European countries, which has curbed the N pollution trends particularly in regions with high stocking rates of animals. However, improvement is slowing down and environmental targets for N are not within reach. Building on the 2011 European Nitrogen Assessment, the current paper reviews key features of the complex relationships between N use and food production in Europe in order to develop novel options for a more N-efficient, less N-polluting and secure European food system. One option is to relocate feed and livestock production from Northwestern to Central and Eastern Europe. This would allow a reduction of N rates and N pollution in cereal production in Northwest Europe by 30% (50 kg N/ha), while increasing total cereal production in Europe. Another option is a change towards legume-based cropping systems to produce animal feed, in order to decrease dependence on N fertilizer and feed imports. The greatest challenge for Europe is to decrease the demand for feed commodities, and thus for land and N, by a shift to more balanced (and healthier) diets with less animal protein. These drastic changes can be stimulated by targeted public–private research funding, while the actual implementation can be enhanced by smart payment schemes using, for example money from the Common Agricultural Policy, certification and agreements between stakeholders and players in the food and energy chain. Involving networks of consumers, producers and non-governmental organizations is critical. An effective strategy starts with convincing consumers with aWestern diet to eat less meat and dairy by communicating the associated health benefits and smaller ecological footprints. Internalizing the cost of N pollution leading to increased prices for N-intensive food products may also enhance involvement of consumers and provide financial resources to compensate farmers for loss of income and extra costs for stricter N measures.
    Feed-milk-manure nitrogen relationships in global dairy production systems
    Powell, J.M. ; Macleod, M. ; Vellinga, Th.V. ; Opio, C. ; Falcucci, A. ; Tempio, G. ; Steinfeld, H. ; Gerber, P. - \ 2013
    Livestock Science 152 (2013)2-3. - ISSN 1871-1413 - p. 261 - 272.
    dietary-protein - nutrient management - use efficiency - urea nitrogen - farms - cows - excretion - cycle - performance - emissions
    Nitrogen (N) inputs from fertilizer, biologically-fixed N, feed, and animal manure sustain productive agriculture. Agricultural systems are limited however in their ability to incorporate N into products, and environmental N losses may become local, regional and global concerns. The anticipated increases in global demand for food, especially for animal products, necessitate an urgent search for practices that enhance N use efficiency (NUE) and reduce environmental N loss. The objectives of this study were to determine feed-milk-manure N relationships for the global dairy herd, and to evaluate how well regional and production system determinations of these relationships correspond to measurements made under experimental conditions and on commercial dairy farms. Data on dairy cattle populations, feed and milk production from 142 countries were used in a Life Cycle Assessment (LCA) model to determine dry matter intake (DMI), N intake (NI), the percentage of NI secreted as milk N (NUE-milk), the percent of NI used by the whole-herd (NUE-herd), and manure N excretion (Nex). On a global basis, an average lactating cow weighs approximately 420 kg; per animal unit (AU = 1000 kg live weight) daily DMI and NI are 21.0 kg and 477 g, respectively; annual milk production is 5000 kg/AU; and NUE-milk and NUE-herd are 16.0% and 15.6%, respectively. Approximately 37% of global lactating cows have NUE-milk of <10% and these low efficient cows account for 10% of the milk production and 33% of Nex globally. Approximately 30% of global lactating cows have NUE-milk between 21% and 25% and these cows account for 53% of the milk production and 35% of Nex globally. Estimates of NUE-milk and Nex corresponded well to measurements under experimental and commercial farm conditions. Study determinations of Nex were however 3-50% lower than IPCC Tier 1 values of Nex for Africa, Middle East, Latin America and Asia. The apparent accuracy of LCA model calculations of Nex should enhance regional, production system and global determinations of dairy Nex loss during collection, storage, and land application, and the amounts of Nex actually recycled through crops and pastures. Published by Elsevier B.V.
    Herkenningskaart nutriëntenbeschikbaarheid.
    Hanegraaf, M. ; Alebeek, F.A.N. van - \ 2013
    akkerbouw - bemesting - nutrientenbeheer - stikstof - gebreksziekten - monitoring - arable farming - fertilizer application - nutrient management - nitrogen - deficiency diseases - monitoring
    De beschikbaarheid van voedingsstoffen in de bodem voor planten wordt voor een groot deel bepaald door de interacties van het bodemleven met de aanwezige organische stof in de bodem. Door grondmonsters te nemen en deze te laten onderzoeken, krijgt u een uitvoerig overzicht van de (in potentie) aanwezige voedingsstoffen voor uw gewassen. Maar niet altijd zijn die potentieel aanwezige stoffen opneembaar voor de plant. Bijvoorbeeld door een onvoldoende of te late vertering van meststoffen, of een te lage pH, door slechte doorworteling of door stagnerend water en zuurstofgebrek
    Options for closing the phosphorus cycle in agriculture : assessment of options for Northwest Europe and the Netherlands
    Lesschen, J.P. ; Kolk, J.W.H. van der; Dijk, K.C. van; Willemse, J. - \ 2013
    Wageningen : Wettelijke Onderzoekstaken Natuur & Milieu (WOt-werkdocument 353) - 47
    veehouderij - dierhouderij - veevoeder - dierlijke meststoffen - fosfor - nutrientenbeheer - kringlopen - mestoverschotten - gesloten systemen - landbouwbeleid - regionaal landbouwbeleid - noordwest-europa - livestock farming - animal husbandry - fodder - animal manures - phosphorus - nutrient management - cycling - manure surpluses - closed systems - agricultural policy - regional agricultural policy - northwestern europe
    This study assessed which options are available for closing the feed-manure phosphorus cycle in agriculture and their contribution to the reduction of the P surplus and P use efficiency. This was assessed at a national scale for the Netherlands as well as a regional scale for Northwest Europe. No export of animal products, with as a consequence the reduction in livestock numbers, is most effective in reducing external P inputs. An effective option that is easier to implement is the reduction in P excretion through changes in the feed intake. For Nortwest Europe the combination of all five options can lead to a reduction of external P inputs of about 50%. For the Netherlands the combination of the options result in a reduction in external P inputs of 35% and a reduction of the manure export of 26%. The effectiveness of large scale manure treatment in the Netherlands is limited
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