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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    Above- and Below-ground Cascading Effects of Wild Ungulates in Temperate Forests
    Ramirez, Ignacio ; Jansen, Patrick A. ; Ouden, Jan den; Moktan, Laxmi ; Herdoiza, Natalie ; Poorter, Lourens - \ 2020
    Ecosystems (2020). - ISSN 1432-9840
    decomposition - invertebrate - litter - mineralization - regeneration - rodent - soil quality - temperate forest - Ungulate

    Ungulates have become abundant in many temperate forests, shifting tree species composition by browsing and altering soil physical conditions by trampling. Whether these effects cascade down to other trophic levels and ecosystem processes is poorly understood. Here, we assess the paths through which ungulates have cascading effects on other trophic levels (regeneration, litter, invertebrates, rodents and organic matter decomposition). We compared ungulate effects by comparing 15 response variables related to different trophic levels between paired fenced and unfenced plots in twelve temperate forest sites across the Netherlands, and used pathway analysis model to identify the (in)direct pathways through which ungulates have influenced these variables. We found that plots with ungulates (that is, unfenced) compared to plots without (that is, fenced) had lower litter depth, sapling diversity, sapling density, rodent activity, macro-invertebrate biomass, decomposition rate of tea bags, pine and birch litter and higher soil compaction. These findings were used in a path analysis to establish potential causal relationships, which showed that ungulate presence: decreased sapling density, which indirectly decreased rodent activity; decreased litter depth, which indirectly reduced invertebrate diversity; increased soil compaction, which also decreased invertebrate diversity. Soil pH decreased invertebrate biomass, which also increased nitrogen mineralization. Yet, we did not find cascading effects of ungulates on decomposition rates. Importantly, an increase in ungulate abundance strengthens the cascading effects in this system. Our results suggest that ungulates can trigger cascading effects on lower trophic levels, yet decomposition and mineralization rates are resilient to ungulate browsing and trampling. Therefore, temperate forests conservation could benefit by limiting ungulate abundance.

    Metabarcoding of nematode communities for soil quality evaluation
    Bongiorno, Giulia ; Bodenhausen, Natacha ; Bünemann, Else K. ; Brussaard, Lijbert ; Geisen, Stefan ; Mäder, Paul ; Quist, Casper ; Walser, Jean-Claude ; Goede, Ron de - \ 2019
    Wageningen University
    PRJEB32262 - ERP114920 - nematodes - nematode community - soil quality
    Nematodes are abundant and diverse in nearly any soil, and directly and indirectly contribute to important soil functions such as nutrient cycling, decomposition, and pest and pathogen regulation. In addition, nematode communities have been shown to be sensitive to agricultural management such as tillage and organic matter additions. As such, soil nematode are promising indicators for soil quality. Morphological assessment of nematode communities and indices such as the maturity index (MI), enrichment index (EI), structure index (SI) and channel index (CI) have been used for soil quality evaluations. Molecular methods to study community composition and diversity offer advantages compared to traditional methods in terms of cost, time, resolution and throughput. Thus far, the use of molecular data to calculate indices has not received much attention. In the present study we used molecular methods to: i) assess the effects of soil management on nematode qPCR counts, alpha- and beta- diversity, and food web indices; ii) identify nematode taxa specific to certain soil management, and iii) investigate the relationship between nematode community parameters with soil chemical, physical and biological parameters. We assessed nematodes communities with metabarcoding in 10 European long-term field experiments to study the effect of tillage (conventional vs reduced) and organic matter addition (low vs high).
    Harvesting European knowledge on soil functions and land management using multi-criteria decision analysis
    Bampa, Francesca ; O'Sullivan, Lilian ; Madena, Kirsten ; Sandén, Taru ; Spiegel, Heide ; Henriksen, Christian Bugge ; Ghaley, Bhim Bahadur ; Jones, Arwyn ; Staes, Jan ; Sturel, Sylvain ; Trajanov, Aneta ; Creamer, Rachel E. ; Debeljak, Marko - \ 2019
    Soil Use and Management 35 (2019)1. - ISSN 0266-0032 - p. 6 - 20.
    DEX model - farmers and multi-stakeholders - locally relevant advice - participatory research - soil quality

    Soil and its ecosystem functions play a societal role in securing sustainable food production while safeguarding natural resources. A functional land management framework has been proposed to optimize the agro-environmental outputs from the land and specifically the supply and demand of soil functions such as (a) primary productivity, (b) carbon sequestration, (c) water purification and regulation, (d) biodiversity and (e) nutrient cycling, for which soil knowledge is essential. From the outset, the LANDMARK multi-actor research project integrates harvested knowledge from local, national and European stakeholders to develop such guidelines, creating a sense of ownership, trust and reciprocity of the outcomes. About 470 stakeholders from five European countries participated in 32 structured workshops covering multiple land uses in six climatic zones. The harmonized results include stakeholders’ priorities and concerns, perceptions on soil quality and functions, implementation of tools, management techniques, indicators and monitoring, activities and policies, knowledge gaps and ideas. Multi-criteria decision analysis was used for data analysis. Two qualitative models were developed using Decision EXpert methodology to evaluate “knowledge” and “needs”. Soil quality perceptions differed across workshops, depending on the stakeholder level and regionally established terminologies. Stakeholders had good inherent knowledge about soil functioning, but several gaps were identified. In terms of critical requirements, stakeholders defined high technical, activity and policy needs in (a) financial incentives, (b) credible information on improving more sustainable management practices, (c) locally relevant advice, (d) farmers’ discussion groups, (e) training programmes, (f) funding for applied research and monitoring, and (g) strengthening soil science in education.

    European long-term field experiments : knowledge gained about alternative management practices
    Sandén, T. ; Spiegel, H. ; Stüger, H.P. ; Schlatter, N. ; Haslmayr, H.P. ; Zavattaro, L. ; Grignani, C. ; Bechini, L. ; D′Hose, T. ; Molendijk, L. ; Pecio, A. ; Jarosz, Z. ; Guzmán, G. ; Vanderlinden, K. ; Giráldez, J.V. ; Mallast, J. ; Berge, H. ten - \ 2018
    Soil Use and Management 34 (2018)2. - ISSN 0266-0032 - p. 167 - 176.
    alternative management practices - Europe - Long-term experiment - productivity - soil quality

    Alternative management practices such as no-tillage compared to conventional tillage are expected to recover or increase soil quality and productivity, even though all of these aspects are rarely studied together. Long-term field experiments (LTEs) enable analysis of alternative management practices over time. This study investigated a total of 251 European LTEs in which alternative management practices such as crop rotation, catch crops, cover crops/green manure, no-tillage, non-inversion tillage and organic fertilization were applied. Response ratios of indicators for soil quality, climate change and productivity between alternative and reference management practices were derived from a total of 260 publications. Both positive and negative effects of alternative management practices on the different indicators were shown and, as expected, no alternative management practice could comply with all objectives simultaneously. Productivity was hampered by non-inversion tillage, FYM amendments and incorporation of crop residues. SOC contents were increased significantly following organic fertilizers and non-inversion tillage. GHG emissions were increased by slurry application and incorporation of crop residues. Our study showed that alternative management practices beneficial to one group of indicators (e.g. organic fertilizers for biological soil quality indicators) are not necessarily beneficial to other indicators (e.g. increase of crop yields). We conclude that LTEs are valuable for finding ways forward in protecting European soils as well as finding evidence-based alternative management practices for the future; however, experiments should focus more on biological soil quality indicators as well as GHG emissions to enable better evaluation of trade-offs and mutual benefits of management practices.

    Effect verandering landgebruik op emissies broeikasgassen
    Vellinga, T. ; Eekeren, N. van - \ 2017
    V-focus 14 (2017)2. - ISSN 1574-1575 - p. 38 - 39.
    landgebruik - bodemkwaliteit - broeikasgassen - emissie - melkveehouderij - graslanden - wisselbouw - grasklaver - land use - soil quality - greenhouse gases - emission - dairy farming - grasslands - ley farming - grass-clover swards
    In het vorige nummer van V-focus is besproken wat het optimale landgebruik voor bodemkwaliteit is op melkveebedrijven met gras en mais, namelijk: 60% blijvend grasland met een lage frequentie van graslandvernieuwing en 20% grasklaver (rode en witte klaver) in rotatie met 20% bouwland. In het hetzelfde nummerwerd uitgerekend dat dit een gemiddeld melkveebedrijf 7.000 euro per jaar oplevert. In het Project Vruchtbare Kringloop Achterhoek en Liemers (VKA) is gekeken wat dit betekent voor de emissie van broeikasgassen. In de kennisgroep Melk&Klimaat van VKA werken melkveehouders, samen met FrieslandCampina, aan het verminderen van de ‘carbonfootprint’ van melk
    Effect van mest op de biologische bodemkwaliteit in de Zeeuwse akkerbouw
    Bloem, Jaap ; Koopmans, Chris ; Schils, René - \ 2017
    Wageningen : Wageningen Environmental Research (Wageningen Environmental Research rapport 2843) - 53
    dierlijke meststoffen - bodemkwaliteit - akkerbouw - zeeland - nederland - animal manures - soil quality - arable farming - zeeland - netherlands
    Dit rapport begint met een overzicht van de mestsamenstelling (hoofdstuk 2). Daarna volgt een beschrijving van bodemvruchtbaarheid in het algemeen en bodembiodiversiteit in het bijzonder (hoofdstuk 3). De analyse van effecten van mest is in hoofdstuk 4 beschreven.
    Invloed van vaste rijpaden op de bodem
    Balen, D.J.M. van - \ 2017
    BIOpraktijk
    landbouw - biologische landbouw - akkerbouw - grondbewerking - bodemdeeltjes - bodemverdichting - bodemsamenstelling - bodemstructuur - grondbewerking gericht op bodemconservering - bodemkwaliteit - rijspoorverdichtingen - verdichting - agriculture - organic farming - arable farming - tillage - aggregates - soil compaction - soil composition - soil structure - conservation tillage - soil quality - tractor pans - compaction
    Landbewerking: video over de invloed van vaste rijpaden op de bodem
    Effecten van verbetering bodemkwaliteit op waterhuishouding en waterkwaliteit : deelstudies Goede Grond voor een duurzaam watersysteem
    Groenendijk, Piet ; Schipper, Peter ; Hendriks, Rob ; Akker, Jan van den; Heinen, Marius - \ 2017
    Wageningen : Wageningen Environmental Research (Wageningen Environmental Research rapport 2811) - 127
    bodemkwaliteit - watersystemen - bodemverdichting - maatregelen - uitspoelen - soil quality - water systems - soil compaction - measures - leaching
    Het doel van het onderhavige onderzoek is om een antwoord te geven op de vrasag: 'hoe kunnen effecten van maatregelen ter verbetering van de bodemkwaliteit op het watersysteem gekwantificeerd worden, welke meetgegevens zijn daarvoor nodig en hoe kunnen de effecten kwantitatief in beeld gebracht worden zodat ze meegewogen kunnen worden in besluitvormingsprocessen?'
    Research for AGRI Committee : preserving agricultural soils in the EU - Study
    Berge, H.F.M. ten; Schroder, J.J. ; Olesen, Jørgen Eivind ; Giraldez Cervera, J.V. - \ 2017
    Brussels : European Parliament - ISBN 9789184609550 - 135
    soil management - soil quality - european union - soil organic matter - biodiversity - agriculture - organic farming - bodembeheer - bodemkwaliteit - europese unie - organisch bodemmateriaal - biodiversiteit - landbouw - biologische landbouw
    This study explains how threats to soils and soil services are linked to agricultural soil management, how threats can be mitigated, and which barriers complicate this. It highlights trade-offs and synergies that exist between different interests affected by soil management, such as climate change mitigation, water and air quality, biodiversity, food security and farm income. Conservation of peatland and extensive agro-forestry systems, and protecting soils against sealing, erosion and compaction are ranked as highest priorities. Potential policy elements are suggested.
    De effecten van gereduceerde grondbewerking : groenbemesters beschermen bodem in winter en verminderen onkruiddruk in groeiseizoen
    Balen, D.J.M. van; Leeuwen-Haagsma, W.K. van - \ 2017
    Ekoland 37 (2017)5. - ISSN 0926-9142 - p. 12 - 13.
    groenbemesters - biologische landbouw - bodemkwaliteit - bodem - bodembiologie - organische stof - gereduceerde grondbewerking - green manures - organic farming - soil quality - soil - soil biology - organic matter - reduced tillage
    Binnen de biologische landbouw was er altijd extra aandacht voor bodemkwaliteit. De bodem voedt de plant tenslotte. Intussen beginnen wat meer te leren over welke processen er zich in de bodem afspelen. En over de rol die planten spelen. Naast gewas- en rassenkeuze kunnen groenbemesters en mengsels van gewassen en groenbemesters een belangrijke rol spelen. Zo kan ook de plant de bodem voeden.
    Zoeken naar betekenis in twee waarheden : samenhang tussen bodem- en voedselkwaliteit tijdens symposium niet opgehelderd
    Gils, S.H. van - \ 2017
    Ekoland (2017)4. - ISSN 0926-9142 - p. 32 - 33.
    bodembeheer - bodemkwaliteit - voedselkwaliteit - voeding en gezondheid - voedselproductie - biologische landbouw - melkveehouderij - bemesting - soil management - soil quality - food quality - nutrition and health - food production - organic farming - dairy farming - fertilizer application
    In de landbouw bestaan er twee waarheden: die van de wetenschap en die van de praktijk. Tijdens het symposium Sustainable soil management & healthy food bleken die twee waarheden vooralsnog onverenigbaar. “Niet om te beledigen, maar de praktijk loopt toch een beetje voor op de wetenschap”, vindt melkveehouder Kees van Gaalen.
    Biotic interactions and trait-based ecosystem functioning in soil
    Sechi, Valentina - \ 2017
    Wageningen University. Promotor(en): L. Brussaard, co-promotor(en): R.G.M. de Goede; C. Mulder; M. Rutgers. - Wageningen : Wageningen University - ISBN 9789463431316 - 176
    soil - ecosystems - plant-animal interactions - interactions - soil biology - soil quality - grasslands - collembola - diversity - bodem - ecosystemen - plant-dier interacties - interacties - bodembiologie - bodemkwaliteit - graslanden - collembola - diversiteit

    Recent emphasis on ecosystem services as a framework to evaluate ecosystems and to promote their sustainable use has drawn attention to how organisms contribute to the delivery of services. Soil attributes and biotic interactions play important roles in ecological processes (e.g. soil formation, nutrient turnover, carbon sequestration and transformation) and, consequently, in the related delivery of ecosystem services.

    Therefore, understanding how soil organisms interact and how they respond to environmental conditions is fundamental to preserve soil functioning and provide a meaningful assessment of ecosystem services. Functional traits determine individual responses to pressures and their effects on ecosystem functioning hence, investigating soil ecosystems from a trait-based perspective offers an interesting opportunity to link the functional responses of the organisms to environmental pressures and to give insight into how the entire community influences ecological processes.

    The main objective of this thesis is to develop and to test concepts for a trait-driven quantification of ecosystem services through the assessment of the effects of land management on soil processes. In particular, it focuses on exploring the potential of a trait-based approach in identifying and better understanding the response of the soil biota to environmental pressures and analyses the responses of soil organisms in terms of changes in functional trait distribution and trophic interactions.

    This work shows that approaches taking the whole soil community into consideration are more suitable to give insight into the effect of anthropogenic pressure on ecosystem functioning than approaches based on single taxonomic groups. Moreover, performing combined analysis (e.g. analysing body-mass distribution and trophic grouping) helps to better identify community response to environmental pressure.

    A clear methodology for the next step, i.e. quantification of ecosystem services, is still lacking due to the current difficulties to link and quantify the effect of anthropogenic pressure to ecosystem functioning in soil. For this reason, it is essential that methods analysed in this thesis will be further explored under different environmental pressures to enable the development of tools to be used at the interface of science and society for sustainable development.

    Closing the nutrient loops in (peri-)urban farming systems through composting
    Nigussie, Abebe - \ 2017
    Wageningen University. Promotor(en): Thomas Kuijper; A. de Neergaard, co-promotor(en): S. Bruun. - Wageningen : Wageningen University - ISBN 9789463430050 - 144
    urban agriculture - farming systems - nutrients - composting - refuse - sewage - waste treatment - vermicomposting - soil quality - nitrogen - ethiopia - stadslandbouw - bedrijfssystemen - voedingsstoffen - compostering - vuilnis - rioolwater - afvalverwerking - vermicompostering - bodemkwaliteit - stikstof - ethiopië

    Organic amendments are used to improve soil fertility and maintain agricultural fields in a productive state. Despite these benefits, the use of organic amendments is limited in many developing countries. The overall objective of this thesis is therefore to provide a better understanding of current waste management practices in developing countries and ensure sustainable crop production via the biotransformation of urban waste into a high-quality soil amendment. First, I aimed at determining the causes for the limited use of organic amendments in small-scale urban farming systems. I interviewed 220 urban farmers in Ethiopia and found that competition for agricultural waste between fuel, feed and soil amendment is a major cause for the limited use of organic amendments. I demonstrated that allocation of agricultural waste for soil amendment is linked with farmers’ livelihood strategies. I also studied variation in compost demand among different farmer groups, and the socio-economic variables which explained these variations.

    Gaseous losses of ammonia and greenhouse gas (GHG) emissions occur during composting of nitrogen-rich urban waste. Several technologies could reduce these losses. However, these technologies are inadequate to fit within the broader farming systems because they are expensive. The second aim of this thesis was to develop low-cost methods to mitigate N losses and GHG emissions from composting, while retaining its fertilising value.

    Composting by earthworms (vermicomposting) is proposed as a low-cost strategy for minimising N losses and GHG emissions. Using a wide range of substrate qualities (C:N ratio, labile C sources) and other factors (earthworm density, amount of input, and moisture), I showed that vermicomposting reduced N losses and GHG emissions compared with traditional thermophilic composting, but the magnitude of the earthworm effect varied between substrates. Earthworms also change the quantity and composition of dissolved organic carbon during composting. Another low-cost strategy is to delay the addition of N-rich substrates during composting. I demonstrated that addition of nitrogen-rich substrate after the thermophilic phase reduced N losses. Delayed addition of N-rich substrates increased N2O emissions, but reduced CH4 emissions. Delayed addition resulted in compost that was as stable and effective at completely eradicating weed seeds as traditional composting.

    In conclusion, urban waste compost should be considered as alternative source for soil amendment, particularly in developing countries with competition for agricultural waste. Technologies such as vermicomposting and delayed addition of N-rich substrate are recommended to increase or maintain the nitrogen content of compost, reduce N losses and mitigate GHG emissions.

    Invloed van gewassen op bodemkwaliteit: Variatie tussen genotypen : een verkennende literatuurstudie voor ruwvoedergewassen
    Wiel, Clemens C.M. van de; Linden, Gerard van der; Sukkel, Wijnand - \ 2017
    Wageningen : Wageningen Plant Research (Rapport / Wageningen Plant Research 668) - 17
    voederplanten - ruwvoer (forage) - bodemkwaliteit - genotypen - fodder plants - forage - soil quality - genotypes
    Gewassen beïnvloeden de bodem waarop ze geteeld worden. In deze verkennende literatuurstudie is onderzocht wat er bekend is over variatie tussen verschillende genotypen/plantenrassen met betrekking tot hun effect op bodemkwaliteit voor een aantal ruwvoedergewassen, in het bijzonder Maïs (Zea mays), Engels raaigras (Lolium perenne) en Witte klaver (Trifolium repens). Dergelijke variatie zou mogelijkheden kunnen bieden om via veredeling en het inzetten van specifieke rassen de bodemkwaliteit te verbeteren. Er is betrekkelijk weinig onderzoek vanuit deze invalshoek gedaan. De focus van de studie was gericht op variatie in wortelarchitectuur, en wortelexudatie en wortelafsterving/nieuwvorming in relatie tot het organische stof gehalte en beschikbaarheid van nutriënten, en de bodem biota, met name mycorrhiza.
    De bodem onder ons Bestaan
    Brussaard, Lijbert - \ 2016
    Wageningen : Wageningen University & Research - ISBN 9789463430081 - 24
    bodem - bodembiologie - bodemkwaliteit - soil - soil biology - soil quality
    Chemisch-fysische schematisering van de bodem voor NHI-waterkwaliteit : naar een nieuwe fysisch-chemische schematisering van de Nederlandse bodem
    Bolt, Frank van der; Walvoort, Dennis ; Vries, Folkert de; Hoogland, Tom ; Vroon, Henk ; Groenendijk, Piet ; Renaud, Leo ; Massop, Harry ; Veldhuizen, Ab ; Walsum, Paul van - \ 2016
    Wageningen : Wageningen Environmental Research (Wageningen Environmental Research rapport 2753) - 34
    bodem - bodemkwaliteit - hydrologie - bodemeigenschappen - bodemkarteringen - soil - soil quality - hydrology - soil properties - soil surveys
    Voor de ontwikkeling van het Nationaal Hydrologisch Instrumentarium-waterkwaliteit is een aanpak opgesteld om de fysisch-chemische schematisering van de bodem in Nederland verder te ontwikkelen. Op korte termijn (2017-2018) is een pragmatische werkwijze nodig om de bodemchemische parameters met bijbehorende schematisering in representatieve eenheden voor de operationele toepassing voor landelijke beleidsstudies te actualiseren. Het gebruik van de huidige fysischchemische karakterisering voor de bodemkaart 1:50.000 vormt de geëigende methode. Op de langere termijn is het de wens om het Nationaal Hydrologisch Instrumentarium-waterkwaliteit ook te kunnen inzetten voor regionale toepassingen. Dit kan alleen als er een gedetailleerde geostatistisch gesimuleerde 3D-bodemkaart aan ten grondslag ligt die recht doen aan regionale variabiliteit van de bodem.
    NKG met woelen gunstig voor gewasgroei
    Balen, Derk van - \ 2016
    tillage - minimum tillage - reduced tillage - conservation tillage - soil structure - crop yield - soil quality
    Leve(n) de bodem! : de basis onder ons bestaan
    Brussaard, L. ; Govers, F.P.M. ; Buiter, R.M. - \ 2016
    Den Haag : Stichting Bio-Wetenschappen en Maatschappij (Cahier / Biowetenschappen en Maatschappij 35e jaargang (2016) kwartaal 3) - ISBN 9789073196834 - 88
    bodemkunde - bodembiologie - bodemkwaliteit - landbouwgronden - bodemvruchtbaarheid - bodembeheer - bodemweerbaarheid - bodemmicrobiologie - duurzaam bodemgebruik - lesmaterialen - soil science - soil biology - soil quality - agricultural soils - soil fertility - soil management - soil suppressiveness - soil microbiology - sustainable land use - teaching materials
    De bodem is niet alleen letterlijk de grond onder ons bestaan, ze is dat ook figuurlijk. Vruchtbare bodems leveren ons bijvoorbeeld voedsel, water en grondstoffen, maar ook een heel scala aan andere ecosysteemdiensten. In één theelepel zwarte grond leven meer organismen dan er mensen zijn op de hele aarde. Ze zorgen ervoor dat planten gebruik kunnen maken van de voedingsstoffen in de bodem en in een gezonde bodem krijgen ziekteverwekkers ook minder kans. Nu we steeds beter begrijpen hóe ze dat doen, kunnen wij zelfs nieuwe antibiotica vinden in de bodem! In dit cahier laten wetenschappers van naam op het gebied van het bodemonderzoek niet alleen zien welke diensten een gezonde bodem al vele eeuwen levert. Ze vertellen ook hoe de figuurlijke bodem onder ons bestaan tegelijk grond voor inspiratie is voor voedsel en technologie voor de toekomst.
    Bodemverbeteraars met focus op biochar
    Reuler, H. van; Baltissen, A.H.M.C. - \ 2016
    - 15
    bodemverbeteraars - biochar - bodemkwaliteit - bodemvruchtbaarheid - bodembiologie - soil conditioners - biochar - soil quality - soil fertility - soil biology
    Biochar is een stabiele organische verbinding die hoofdzakelijk uit koolstof bestaat. Het ontstaat bij verhitting van biomassa onder zuurstofloze omstandigheden, z.g. pyrolyse. Biochar wordt geproduceerd als bodemverbeteraar. De discussie gaat om het effect van Biochar toediening op een aantal bodemfuncties, zoals b.v. het vermogen om vocht en voedingsstoffen vast te houden, biologische activiteit.
    Inspiratiesessie ''Bodemverbeteraars: hoop of hype?''
    Os, G.J. van - \ 2016
    Aeres Hogeschool
    bodembeheer - bodemverbeteraars - bodemkwaliteit - bodemstructuur - gewasopbrengst - landbouwkundig onderzoek - soil management - soil conditioners - soil quality - soil structure - crop yield - agricultural research
    Inspiratiesessie bij CAH Vilentum door Gera van Os, Lector Duurzaam Bodembeheer, ''Bodemverbeteraars: hoop of hype?''
    Meer informatie op http://www.kcagro.nl
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