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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    What drives farmers to increase soil organic matter? Insights from the Netherlands
    Hijbeek, R. ; Pronk, A.A. ; Ittersum, M.K. van; Berge, H.F.M. ten; Bijttebier, J. ; Verhagen, A. - \ 2018
    Soil Use and Management 34 (2018)1. - ISSN 0266-0032 - p. 85 - 100.
    farmers’ behaviour - farmers’ intentions - organic materials - soil conservation - soil management - soil organic matter - theory of planned behaviour

    Soil organic matter (SOM) is an important resource base for arable farming. For policies on SOM to be effective, insight is needed on why and under which conditions farmers are willing to increase SOM content. This study used the theory of planned behaviour to analyse what prevents or encourages Dutch farmers to increase the SOM content of their fields. In an online survey, 435 arable farmers were asked questions to understand their attitude (perceived benefits), subjective norm (social pressure) and perceived behavioural control (anticipated impediments and obstacles) related to management of SOM. Farmers’ answers were related to their intention to increase SOM content, use of organic materials and perceived increase in SOM content. Our results showed that Dutch farmers are well aware of the possible benefits of SOM content for crop productivity. Farmers’ attitude, subjective norm and perceived decrease in SOM content were significantly related to their intention to increase SOM content. In our farm survey, this intention was very strong: 90% of the farmers stated a high or very high intention to increase the SOM content of their fields. A higher intention to increase SOM content was correlated with the use of organic materials as expressed as total and effective C (P = 0.003 and P = 0.002, respectively), but this did not lead to a perceived increase in SOM content. From a farmer's point of view, this indicates that increasing SOM content is to a large degree beyond their direct influence. The Dutch Manure and Fertiliser Act, costs of organic inputs and the need to cultivate profitable crops (such as potatoes or sugar beet) were indicated as important impeding factors for increasing SOM content.

    On the role of soil organic matter for crop production in European arable farming
    Hijbeek, Renske - \ 2017
    Wageningen University. Promotor(en): M.K. van Ittersum, co-promotor(en): H.F.M. ten Berge. - Wageningen : Wageningen University - ISBN 9789463436632 - 211
    soil fertility - soil fertility management - soil management - soil conservation - organic matter - soil organic matter - nitrogen - nitrogen fertilizers - green manures - manures - straw - soil carbon sequestration - cover crops - crop yield - yields - meta-analysis - food security - europe - drivers - barriers - bodemvruchtbaarheid - bodemvruchtbaarheidsbeheer - bodembeheer - bodembescherming - organische stof - organisch bodemmateriaal - stikstof - stikstofmeststoffen - groenbemesters - mest - stro - koolstofvastlegging in de bodem - dekgewassen - gewasopbrengst - opbrengsten - meta-analyse - voedselzekerheid - europa - chauffeurs - barrières

    The aim of this thesis was to improve understanding of the role of organic inputs and soil organic matter (SOM) for crop production in contemporary arable farming in Europe. For this purpose, long-term experiments were analysed on the additional yield effect of organic inputs and savings in mineral fertiliser. In addition, a farm survey was conducted to find drivers and barriers for the use of organic inputs and to assess if arable farmers in Europe perceive a deficiency of SOM.

    The findings in this thesis suggest that at least on the shorter term, on average, there seems to be no immediate threat from a deficiency of SOM to crop production in arable farming in Europe. The long-term experiments showed that with sufficient use of only mineral fertilisers, on average, similar yields could be attained over multiple years as with the combined use of organic inputs and mineral fertiliser. This was reflected in the farm survey, in which a large majority of farmers indicated not to perceive a deficiency of SOM. Analysis of long-term experiments also showed that more mineral fertiliser N was saved when using farmyard manure at high N rates (with mineral fertiliser application) than at low N rates (without mineral fertiliser application), based on comparisons at equal yield.

    Specific crops and environments did benefit from organic inputs and more SOM in terms of crop production. Long-term experiments showed that organic inputs give benefit to crop production in wet climates and on sandy soils. In addition, farmers perceived a higher deficiency of SOM on steep slopes, sandy soils, wet and very dry climates. The additional yield effect of organic inputs was significant for potatoes. More in general, farmers who cultivated larger shares of their land with specialized crops (including potatoes, sugar beets, onions and other vegetables) than cereals perceived a higher deficiency of SOM. It seems that while the functions of SOM can be replaced with technical means to a large extent (e.g. tillage, use of mineral fertilisers), there are limits to this technical potential when environmental conditions are more extreme and crops are more demanding.

    The farm survey revealed that farmers perceive a trade-off between improved soil quality on the one hand and increased pressures from weeds, pests and diseases and financial consequences on the other hand when using organic inputs. If policies aim to stimulate the maintenance or increase of SOM, more insight is needed into the conditions that regulate the pressures of weeds, pests and diseases in response to organic inputs. Financial consequences (at least on the short term) should also be accounted for. More importantly however, benefits from SOM for crop production cannot be taken for granted. Only in specific situations such benefits will exist. If European policies on SOM aim to include benefits for crop production, focus should be on areas with more extreme environmental conditions (very dry or wet climates, steep slopes, sandy soils), or cropping systems with more specialized or horticultural crops rather than cereals.

    Sustaining reservoir use through sediment trapping in NW Ethiopia
    Getahun, Mulatie Mekonnen - \ 2016
    Wageningen University. Promotor(en): Leo Stroosnijder, co-promotor(en): Saskia Keesstra; Jantiene Baartman. - Wageningen : Wageningen University - ISBN 9789462579101 - 132
    sediment - soil conservation - reservoirs - dams - models - ethiopia - sediment - bodembescherming - reservoirs - dammen - modellen - ethiopië

    To increase crop production and improve food self-sufficiency, rain-fed agriculture need to be supplemented with irrigated agriculture. To this end, a large number of reservoirs had been constructed in Ethiopia. However, reservoirs are suffering from sedimentation. This study was conducted in Minizr catchment, NW Ethiopia to (1) quantify the sediment entering Koga reservoir, (2) to assess the functioning and effectiveness of the existing man-made sediment trapping (ST) measures and natural sediment sinks, and (3) to design a possible solution to tackle the problem. Results of three years (2013-2015) field data show that 38% of the transported sediment was trapped within the Minizr catchment. Although considerable efforts were made to trap the sediment within the catchment through implementing various ST measures, lack of an integrated ST approach causes the remaining 62% of the sediment load still entering Koga reservoir.

    PMR Monitoring natuurcompensatie Voordelta : ontwikkeling vis in de Voordelta na instelling bodembeschermingsgebied ter compensatie van de aanleg Tweede Maasvlakte
    Tulp, Ingrid ; Tien, Nicola ; Damme, Cindy van - \ 2016
    IJmuiden : Wageningen Marine Research (Wageningen Marine Research rapport C089/16) - 148
    vissen - monitoring - natuurcompensatie - natuurbeheer - marien milieu - bodembescherming - fishes - nature compensation - nature management - marine environment - soil conservation
    In deze rapportage worden de bevindingen gepresenteerd van de bemonsteringen vanaf de T0 (2005-2007) tot na de instelling van het Bodembeschermingsgebied (2009-nu), voor zover mogelijk tot en met de resultaten van voorjaar 2013.
    Regenerating degraded soils and increasing water use efficiency on vegetable farms in Uruguay through ecological intensification
    Alliaume, F. - \ 2016
    Wageningen University. Promotor(en): Pablo Tittonell, co-promotor(en): Walter Rossing; Santiago Dogliotti. - Wageningen : Wageningen University - ISBN 9789462578487 - 163
    tillage - minimum tillage - mulches - vegetable growing - water use efficiency - degraded land - soil conservation - modeling - soil management - grondbewerking - minimale grondbewerking - mulches - groenteteelt - watergebruiksrendement - gedegradeerd land - bodembescherming - modelleren - bodembeheer

    This thesis investigated alternative soil management strategies for vegetable crop systems and their hypothesized effects on increasing systems resilience by sequestering soil carbon, increasing the efficiency of water use, and reducing erosion. The goal was to contribute knowledge on and tools for the integrated assessment of soil management strategies for the ecological intensification and small-scale production systems sustainability in South Uruguay.

    We performed a baseline assessment of key soil properties on cropped fields, and evaluated the impact of implementing different soil management strategies after re-design of systems in a co-innovation project. We showed evidence that even under smallholder conditions, it was possible to reverse the soil degradation. However, it was not possible to reduce erosion in cases that a pasture could not be included in the rotation. We evaluated reduced tillage and cover crop management in an experiment. In-situ grown mulching increased water capture by 9.5% and reduced runoff by 37% on average, leading to less erosion risk and greater plant available water. We also collected enough data to develop a simple, generally applicable, locally parameterizable mathematical model that accounts for the effect of soil cover on soil water dynamics. Exploration with 10 years of weather data showed that reduced tillage and mulching (RTmulch) would decrease water requirements for irrigation by 37% on average.

    Finally, we scaled up the results to study the impact of RTmulch on two small horticultural family farms with different resource availabilities. By combining process-based simulation models with empirical data and expert knowledge, we quantified inputs and outputs of production activities. Adoption of RTmulch was associated with improvements of the economic and/or environmental performances. It was possible to design production activities with erosion rates below the tolerable level without sacrificing the family income too much. Average water savings of 775 m3 ha-1 yr-1 (fully irrigated rotations) to 452 (irrigating only the most profitable vegetable crops) were obtained under RTmulch compared with conventional tillage.

    Reduced tillage and mulching have potential for increasing water infiltration, reducing runoff and erosion, and achieving greater efficiency of water use for vegetable crops grown in raised bed systems. These aspects are especially relevant under conditions of high rainfall variability, limited access to irrigation and high soil erosion risk. For future research, we suggest combining long-term experiments with on- farm research to capture the benefits of improving soil quality on soil productivity, while adjusting the technology to solve limitations that arise in the process. This study provides ground for testing the proposed changes on pilot farms, using a co-innovation approach combining scientific insights with farmers’ knowledge of their farms.

    Van bodeminformatie naar bodemmaatregelen
    Haan, Janjo de - \ 2016
    arable farming - soil fertility - soil conservation - farm management - internet - information needs - soil management - teaching materials
    Het ecologisch belang van het Friese Front
    Lindeboom, H.J. ; Rijnsdorp, A.D. ; Witbaard, R. ; Slijkerman, D.M.E. ; Kraan, M.L. - \ 2015
    Den Burg : IMARES (Rapport / IMARES C137/15A) - 24
    bodembescherming - mariene gebieden - overheidsbeleid - natuurbescherming - noordzee - nederland - soil conservation - marine areas - government policy - nature conservation - north sea - netherlands
    Bodembescherming bij doorgangsdepots voor baggerspecie : Verwaarloosbaar bodemrisico met een geochemische barrière
    Zoest, R. van; Harmsen, J. ; Groenenberg, B.J. ; Rietra, R.P.J.J. - \ 2015
    Bodem 2015 (2015)4. - ISSN 0925-1650 - p. 15 - 17.
    baggerspeciedepots - bagger - bodembescherming - landgebruik - risicoanalyse - geochemie - polychloorbifenylen - spoil banks - dredgings - soil conservation - land use - risk analysis - geochemistry - polychlorinated biphenyls
    Bij het ontwateren en rijpen van nuttig toepasbare baggerspecie wordt veelvuldig gebruikt gemaakt van doorgangsdepots. Op initiatief van de waterschappen is een alternatief ontwikkeld voor de bodembescherming met behulp van een folie. Met een minerale bodembeschermingslaag kan eveneens een verwaarloosbaar bodemrisico bereikt worden. Een generieke regeling bleek vooralsnog niet haalbaar.
    Flyshoot visserij in relatie met de instelling van bodem beschermende maatregelen voor het Friese Front en de Centrale Oestergronden
    Rijnsdorp, A.D. - \ 2015
    IJmuiden : IMARES (Rapport / IMARES Wageningen UR C065/15) - 23
    visserij - bodemecologie - onderwatergronden - vissersschepen - vismethoden - vistuig - waterbodems - mariene gebieden - nadelige gevolgen - noordzee - bodembescherming - milieueffect - fisheries - soil ecology - subaqueous soils - fishing vessels - fishing methods - fishing gear - water bottoms - marine areas - adverse effects - north sea - soil conservation - environmental impact
    Dit rapport geeft een samenvatting van de ‘state of the art’ kennis met betrekking tot de impact van bodemberoerende vistuigen en bespreekt de te verwachte effecten van de flyshoot methode in vergelijking met de andere vismethoden.
    Land management in the north-western highlands of Ethiopia: adoption and impact
    Akalu Teshome Firew, ; Firew, A.T. - \ 2014
    Wageningen University. Promotor(en): Leo Stroosnijder, co-promotor(en): Jan de Graaff. - Wageningen : Wageningen University - ISBN 9789462571563 - 148
    grondbeheer - landdegradatie - hooglanden - waterbescherming - bodembescherming - ethiopië - land management - land degradation - highlands - water conservation - soil conservation - ethiopia


    Over the last four decades, the government of Ethiopia and various a consortium of donors have been promoting different land management (LM) practices in the highlands of Ethiopia to halt land degradation. However, the adoption rate of these practices has been low. This is because investments in LM practices are influenced by various institutional, socio-economic and bio-physical factors. The main objective of this research is to investigate the impact of these different factors on investments in LM in the north-western Ethiopian highlands. It focuses on the drivers of the different stages of adoption, on profitability of LM practices, and on land quality, land fragmentation, tenure arrangements and social capital.

    We examined the drivers of the different stages of adoption of soil and water conservation (SWC) practices using an ordered probit model. The results indicate that adoption of soil and water conservation (SWC) passes through four major phases: non-adoption/dis-adoption, initial adoption, actual adoption and final adoption. Some socio-economic and institutional factors have a different effect on the respective SWC adoption phases. Final adoption depends mostly on profitability, land-related factors, social capital and perception of erosion problems.

    We also investigated the effectiveness and profitability of three SWC practices (stone bunds, soil bunds and Fanya juu bunds) using the Universal Soil Loss Equation (USLE) and Cost Benefit Analysis (CBA). The results show that SWC practices are effective in controlling soil erosion, though the profitability of these SWC methods is dependent on the site where they are used. Fanya juu and stone bunds are generally profitable under standard conditions (e.g. medium slope and average soil quality and labour costs). However, the study also shows that different underlying assumptions change the CBA results considerably and consequently also change the conclusions regarding circumstances under which SWC measures are or are not profitable.

    Besides, we assessed farmers’ perceptions about land quality, land fragmentation and tenure systems and their influence on interrelated LM (Bunds, Compost/Manure and Fertilizer) investments using a multivariate probit (MPV) model. The study shows that investments in LM practices are interdependent. For example, compost/manure and fertiliser substitute each other to a certain extent (often not used together, or used interchangeably by farmers) in the farming system of the study areas. Land quality (e.g. slope and soil fertility status), land fragmentation (parcel size and distance of parcel from homestead) and tenure arrangements influence farmers’ investments in LM practices.

    In addition, the relationship between the different dimensions of social capital and investments in LM practices was explored. The results show that the different dimensions of social capital affect LM practices differently. In particular, the cooperation and trust dimensions of social capital are associated with the intensity of investment in SWC bunds and fertiliser use. The extent of participation in formal institutions has a positive effect on the use of fertiliser and compost.

    Furthermore, we evaluated different SWC practices using Multi-Criteria Analysis (MCA) to assess their ecological, economic and social impacts. The study reveals that MCA is an effective evaluation tool that can take into account non- monetary and less quantifiable effects of SWC measures, which is not possible with Cost Benefit Analysis. The results of the analysis indicate that farmers have a range of criteria to evaluate the performance of SWC measures. The relative importance of each criterion in the selection of SWC alternatives depends to a large extent on slope categories.

    For enhancing the adoption and impacts of land management, there is a need to increase knowledge about location specific viable LM practices, to promote collective action at watershed level, to pay more attention to farmers’ preferences and to improve the capacity and capability of farmers.

    Meerjarige effect- en productiemetingen aan MZI's in de Westelijke Waddenzee, Oosterschelde en Voordelta: samenvattend eindrapport
    Kamermans, P. ; Smit, C.J. ; Wijsman, J.W.M. ; Smaal, A.C. - \ 2014
    Yerseke : IMARES (Rapport / IMARES Wageningen UR C191/13) - 93
    mossels - schaal- en schelpdierenvisserij - natura 2000 - bodembescherming - waddenzee - oosterschelde - voordelta - mussels - shellfish fisheries - soil conservation - wadden sea - eastern scheldt
    In het kader van het duurzaam beheer van de Nederlandse kustwateren is besloten tot de transitie van bodemberoerende mosselvisserij naar het gebruik van mosselzaadinvanginstallaties (MZI’s). Deze omschakeling was nodig omdat deze economische activiteit plaatsvindt in de Natura-2000 gebieden Waddenzee, Oosterschelde en Voordelta. Het hier gepresenteerde onderzoek richt zich op het wegnemen van onzekerheden en kennislacunes die gepaard gaan met de reeds uitgevoerde plaatsing en de opschaling van zaadinvang met MZI-systemen.
    Aanzet voor een adviessysteem voor oogst uit het bos : voor een evenwichtige nutriëntenbalans en een goede functievervulling van het bos
    Jong, J.J. de; Briel, J. van den; Vries, W. de; Spijker, J.H. - \ 2014
    Wageningen : Alterra, Wageningen-UR (Alterra-rapport 2494) - 52
    bosexploitatie - bodembescherming - bodemchemie - houtkap - voedingsstoffen - biomassa - habitats - natuurbeheer - biobased economy - forest exploitation - soil conservation - soil chemistry - logging - nutrients - biomass - nature management
    In Nederland zijn afspraken gemaakt om meer biomassa uit het bos te oogsten. Hierdoor kan de beschikbaarheid van voedingsstoffen afnemen. Dit rapport geeft een overzicht over de in andere landen bestaande systemen om uitputting van bosbodems tegen te gaan. Verder wordt een analyse gemaakt van de beschikbaarheid van gegevens om nutriëntenbalansen voor het Nederlandse bos op te stellen en worden eerste indicaties van de balanstermen en voorraden voedingsstoffen gegeven. Afsluitend wordt een aanzet gegeven voor een adviessysteem dat geschikt is voor praktisch gebruik door terreinbeheerders om eraan bij te dragen dat oogst van biomassa uit het bos kan plaatsvinden zonder dat dit tot ongewenste uitputting van nutriënten in de bodem leidt.
    Co-investments in land management: lessons from the Galessa watershed in Ethiopia
    Adimassu, Zenebe ; Kessler, A. ; Stroosnijder, L. - \ 2013
    International Journal of Sustainable Development and World Ecology 20 (2013)6. - ISSN 1350-4509 - p. 532 - 541.
    grass-roots - soil conservation - degradation - highlands - adoption - systems - benefits - africa
    The use of co-investment activities to motivate farmers to carry out sustainable land management is increasingly recognized. Several co-investment efforts have been implemented to combat land degradation and increase agricultural production in the Ethiopian highlands. Nevertheless, these co-investment activities have not been documented. Moreover, the impacts of these activities have not been evaluated. This study presents a co-investment initiative for sustainable land management in the Galessa watershed in Ethiopia. It documents successful co-investment activities that trigger farmers to carry out land management practices, and assesses the impact of these activities on farmers’ land management investments. The most important co-investment activities that trigger farmers to invest in land management are co-investments in awareness creation, water provision, technology, and governance. Of these activities, co-investing in water provision is most successful, because it directly solves one of the basic needs of farmers in the watershed. Results reveal that the experimental group of farmers (participants in the co-investment initiative) – compared to the control group (nonparticipants) – invested significantly more in land management practices such as soil bunds, composting, and tree planting. This article concludes that use of multiple co-investment activities are crucial to trigger farmers to invest in land management in Ethiopia.
    Bodemkwaliteit Veenkoloniën
    Haan, J.J. de; Asperen, P. van; Visser, J.H.M. ; Wijnholds, K.H. - \ 2013
    Lelystad : PPO AGV
    bodembescherming - bodembeheer - minimale grondbewerking - bodemvruchtbaarheid - organische stof - akkerbouw - veenkolonien - soil conservation - soil management - minimum tillage - soil fertility - organic matter - arable farming
    Poster met onderzoeksinformatie. Doel van het project is het ontwikkelen van praktisch toepasbare maatregelen voor een duurzaam bodembeheer in de Veenkoloniën.
    Natuurcompensatie op hoop van zegen (interview met Ingrid Tulp)
    Wilt, H. de; Tulp, I.Y.M. - \ 2013
    Visionair : het vakblad van sportvisserij Nederland 8 (2013)29. - ISSN 1569-7533 - p. 19 - 23.
    havens - ontwerp - grondverzet - natuurcompensatie - bodemfauna - bodembescherming - monitoring - noordzee - harbours - design - earth moving - nature compensation - soil fauna - soil conservation - north sea
    Met het zand van de tweede Maasvlakte kun je de Amsterdam Arena ruim 223 keer vullen. Het illustreert wat er voor de Zuid-Hollandse kust in zee is veranderd. Om het verlies aan zeebodem te compenseren, is een deel van de Voordelta aangewezen als bodembeschermingsgebied. IMARES onderzoekt of dit werkt voor de bodemfauna.
    Onzekerheid en gevoeligheid van het CUMULEO-RAM model
    Vries, P. de - \ 2013
    Den Helder : IMARES (Rapport / IMARES Wageningen UR C136/13) - 23
    noordzee - marien milieu - mariene gebieden - mariene ecologie - benthos - bodembescherming - north sea - marine environment - marine areas - marine ecology - soil conservation
    Slijkerman et al. (2013) onderzocht eerder welke instrumenten ingezet kunnen worden om een oordeel te vellen over effecten van ruimtelijke beschermingsmaatregelen op de zeebodemintegriteit van het Friese Front. Een van de onderzochte instrumenten is het CUMULEO-RAM model. Deze studie is bedoeld om een beter inzicht te krijgen in de gevoeligheid van verschillende typen bodemorganismen voor effecten van menselijk handelen.
    Zeebodemintegriteit en visserij op het Friese Front en de Centrale Oestergronden: Beschikbare kennis en 1e uitwerkingen
    Slijkerman, D.M.E. ; Bos, O.G. ; Wal, J.T. van der; Tamis, J.E. ; Vries, P. de - \ 2013
    Den Helder : IMARES (Rapport / IMARES Wageningen UR C078/13) - 100
    marien milieu - mariene gebieden - mariene ecologie - benthos - bodembescherming - ecosystemen - noordzee - marine environment - marine areas - marine ecology - soil conservation - ecosystems - north sea
    De implementatie van de Europese Kaderrichtlijn Mariene strategie (KRM) is in Nederland in volle gang. Onderdeel van de implementatie is het definieren van ruimtelijke beschermingsmaatregelen. Hierbij worden in de Mariene Strategie als randvoorwaarden meegegeven de ambitie om 10 tot 15 procent van het Nederlandse deel van de Noordzee (NCP) te vrijwaren van bodemberoering; en het tot een minimu beperken van de last voor de visserijsector.
    Zaaien op dorre bodem : wereldwijde aanpak van verwoestijning
    Lynden, Godert van - \ 2013
    land degradation - rehabilitation - soil degradation - soil conservation - world - desertification
    Exploring co-investments in sustainable land management in the Central Rift Valley of Ethiopia
    Adimassu Teferi, Z. ; Kessler, A. ; Stroosnijder, L. - \ 2013
    International Journal of Sustainable Development and World Ecology 20 (2013)1. - ISSN 1350-4509 - p. 32 - 44.
    soil conservation - leadership - policy - accountability - challenges - payments - services - view
    In Ethiopia, not only farmers but also the public and private sector partners are still hesitant to invest in sustainable land management (SLM). This study focuses on the Central Rift Valley and explores the potential for co-investments in SLM, where public and private sector partners support farmers with material, capital, knowledge, etc. A survey revealed current bottlenecks for co-investments and requirements needed to collaboratively invest in SLM. It covered 165 public sector partners (micro-, meso- and macro-level institutions) and 42 private sector partners (banks, exporters and local traders). Results for the public sector show a gap between macro- and micro-/meso-level actors concerning co-investments in SLM. Macro-level institutions do not acknowledge the bottlenecks identified by micro- and meso-level institutions (e.g. lack of accountability, top-down approaches and lack of good leadership). Similarly, opinions on requirements for co-investments in SLM differ considerably, showing that bridging the institutional micro–macro gap is crucial to co-investments. Most factors are related to the wider governance context and to different perceptions among micro- and macro-level actors as to the critical pre-conditions to co-investment in SLM. Improving governance at all institutional levels, capacity building and enhancing a common understanding on barriers to SLM is required. Results for the private sector reveal that economic bottlenecks limit possibilities to co-invest in SLM, and that enabling policies in the public sphere are required to trigger private investments. Hence, the potential for co-investments in SLM is available in Ethiopia at micro- and meso-level and within the private sector, but profound commitment and fundamental policy changes at the macro-level are required to exploit this potential.
    Geen kans voor nieuwe generatie frambozenschorsgalmug : afdekken van bodem effectief
    Helsen, H.H.M. ; Klaassen, W.I.J. - \ 2012
    De Fruitteelt 102 (2012)35. - ISSN 0016-2302 - p. 8 - 9.
    kleinfruit uit de gematigde streken - frambozen - insectenplagen - cecidomyiidae - bestrijdingsmethoden - bodembescherming - afdekken - proeven - temperate small fruits - raspberries - insect pests - control methods - soil conservation - casing - trials
    De frambozenschorsgalmug is een moeilijk te bestrijden plaag in de frambozenteelt. Op de open dag van het Kennis en Innovatie Centrum Kleinfruit (KICK) in Randwijk werden de nieuwste resultaten uit het onderzoek gepresenteerd. Afdekken van de bodem blijkt het verschijnen van een nieuwe generatie muggen te kunnen voorkomen.
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