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| Registros recuperados: 641 | |
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| Sørensen, Peter; Kristensen, E.; Odokonyero, K.; Petersen, S.O.. |
| The utilization of nitrogen (N) in green manure leys can be improved by harvesting, storage and spreading of the plant material as manure in other crops. By green manure storage as silage, storage losses of N are lower than by composting. Also, a relatively high fertilizer value of silage N is achievable depending on the C/N ratio of the material. Nitrogen availability in green manure leys is higher after storage as silage compared to composting. Use of mobile green manures is mainly relevant in arable cropping systems without livestock where utilization of the roughage for animal feed or biogas production is impossible, as costs for ley/roughage harvest and transport can be relatively high. Our study showed that surface application of green manure silage... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Pasture and forage crops; Composting and manuring; Farm nutrient management. |
| Ano: 2013 |
URL: http://orgprints.org/24575/1/24575.pdf |
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| Cuttle, Dr Steve. |
| This is the final report of Defra project OF0180 In 1998, the organic dairy herd at Ty Gwyn, Trawsgoed was split into two herds to examine the physical and financial implications of adopting different feeding strategies and levels of feed self-sufficiency (DEFRA Project OF0146). A self-sufficient system (SS) in which cows were fed a high forage diet supplemented with home-grown cereals was compared with a system in which concentrate feeds were purchased from outside the farm (PC). The present study determined nutrient budgets for the two systems and used models to estimate the various forms of N loss. These studies were supported by field studies to provide additional information about areas of uncertainty identified in previous budget calculations.... |
| Tipo: Report |
Palavras-chave: Pasture and forage crops; Dairy cattle; Farm nutrient management. |
| Ano: 2002 |
URL: http://orgprints.org/8167/1/OF0180_2030_FRP.pdf |
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| Pedersen, Anders; Zhang, Kefeng; Thorup-Kristensen, Kristian; Jensen, Lars Stoumann. |
| We present a 2-D model for simulation of root density and plant nitrogen (N) uptake for crops grown in agricultural systems, based on a modification of the root density equation originally proposed by Gerwitz and Page (1974). A root system form parameter was introduced to describe the distribution of root length vertically and horizontally in the soil profile. The form parameter can vary from 0 where root density is evenly distributed through the soil profile, to 8 where practically all roots are found near the surface. The root model has other components describing root features, such as specific root length and plant N uptake kinetics. The same approach is used to distribute root length horizontally, allowing simulation of root growth and plant N uptake... |
| Tipo: Journal paper |
Palavras-chave: Nutrient turnover; Farm nutrient management; Air and water emissions. |
| Ano: 2009 |
URL: http://orgprints.org/16106/1/16106.pdf |
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| The toolbox aims at making scientific literature and technical information on cover crops and living mulches widely available. It furthermore promotes the current knowledge and impact of innovative subsidiary cropping systems and potential solutions to ecological problems. The tool takes the user, being a new or experienced farmer, through a series of questions, helping determine the crop's requirements in relation to geographical region, soil, crop characteristics and use. This will generate a set of plant profiles that fall within the specifications and allow a comparison of the properties of different species. It identifies suitable cover crop and living mulch species and varieties, appropriate species mixtures, provides information on appropriate... |
| Tipo: Practice tool |
Palavras-chave: Crop husbandry; Farm nutrient management. |
| Ano: 2014 |
URL: http://orgprints.org/30563/1/30563.png |
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| Burgt, Geert-Jan H.M.. |
| Vanwege aanscherpingen in de mestwetgeving en de biologische regelgeving is er grote behoefte om de interne mineralenhuishouding van biologische akkerbouwbedrijven verregaand te optimaliseren. In het project PlantyOrganic, een initiatief van Biowad en uitgevoerd op SPNA locatie Kollumerwaard, wordt een uitdagend bedrijfssysteem ontwikkeld en beproefd: 100% eigen stikstofvoorziening zonder aanvoer van mineralen van buiten het bedrijf. In dit rapport wordt het ontwerp van vruchtwisseling en bemesting gepresenteerd en besproken en wordt de uitgangssituatie van dit in het voorjaar van 2012 gestarte experiment gedocumenteerd. |
| Tipo: Report |
Palavras-chave: Farm nutrient management. |
| Ano: 2012 |
URL: http://orgprints.org/21626/1/2657.pdf |
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| Ohm, Magdalena; Schüler, Maximilian; Paulsen, Hans Marten. |
| Mineral phosphorus (P) fertilizers from fossil reserves are finite which puts agriculture at risk of losing soil fertility. This study calculates P soil balances of an organic dairy farm in Northern Germany to focus on potentials and variations in the farm P cycle. P flows were different between the years because yield levels and amount of manure application varied. Different plant species showed different P export which depended mainly on biomass export. This can also be seen as their site specific mobilization potential. The highest mean P export between 2010 and 2012 was measured with maize (mean 30.4, range 17.7-38.2 kg P ha-1 a-1) and grass-clover (mean 23.7, range 17.3-29.5 kg P ha-1 a-1). By grazing, permanent grassland showed a mean P mobilization... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Farm nutrient management. |
| Ano: 2015 |
URL: http://orgprints.org/27197/1/27197_ohm.pdf |
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| Høgh-Jensen, H; Myaka, F.A.; Sakala, W.D.; Kamalongo, D.; Ngwira, A.; Vesterager, J.M.; Odgaard, R.; Adu-Gyamfi, J.J.. |
| Pigeonpea is one of the few crops with a high potential for resource-poor farmers due to its complementary resource use when intercropped with maize. A three year comprehensive comparative study on the performance of six pigeonpea (Cajanus cajan) varieties on farmers’ fields in Eastern and Southern Africa where intercropping with maize is normal practice, was undertaken. The varieties were tested for accumulation of dry matter (DM), nitrogen (N) and phosphorus (P) in all above-ground organs for three years under farmers’ conditions. The study revealed that the latest introduced ICEAP 00040 outperformed all the other tested varieties (ICP 9145; ICEAP 00020, ICEAP 00053, ICEAP 00068, and a local variety called “Babati White”) under farmer-managed conditions.... |
| Tipo: Journal paper |
Palavras-chave: Farming Systems; Farm nutrient management; Social aspects. |
| Ano: 2007 |
URL: http://orgprints.org/11465/1/11465.pdf |
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| Thorup-Kristensen, Kristian; Cortasa, Montserrat Salmerón; Loges, Ralf. |
| Cropping systems comprising winter catch crops followed by spring wheat could reduce N leaching risks compared to traditional winter wheat systems in humid climates. We studied the soil mineral N (Ninorg) and root growth of winter- and spring wheat to 2.5 m depth during three years. Root depth of winter wheat (2.2 m) was twice that of spring wheat, and this was related to much lower amounts of Ninorg in the 1 to 2.5 m layer after winter wheat (81 kg Ninorg ha-1 less). When growing winter catch crops before spring wheat, N content in the 1 to 2.5 m layer after spring wheat was not different from that after winter wheat. The results suggest that by virtue of its deep rooting, winter wheat may not lead to high levels of leaching as it is often assumed in... |
| Tipo: Journal paper |
Palavras-chave: Nutrient turnover; Farm nutrient management; Crop husbandry; Air and water emissions. |
| Ano: 2009 |
URL: http://orgprints.org/16121/2/16121.pdf |
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| Paixão, Magda Fernanda; Ahrens, Dirk Claudio; Bianconi, Rodolfo; Ohlson, Osvaldo de Castro; Skora Neto, Francisco; Silva, Francinéia Alexandre da; Caieiro, Juliane Terezinha; Nazareno, Nilceu Ricetti Xavier. |
| Estima-se que no Brasil as perdas anuais causadas por pragas durante o armazenamento de grãos equivalem a 10% da produção. O mercado tradicional fornece agrotóxicos para o controle, mas os produtores de base ecológica têm poucas alternativas. Assim, foi objetivo do trabalho verificar a eficácia dos subprodutos do xisto no controle de S. zeamais em sementes de milho. Empregou-se pós de xisto retortado, finos de xisto, calxisto e cinza de xisto (2 e 5 Kg/1000 Kg de sementes), terra diatomácea e testemunha não tratada. Os ensaios foram conduzidos em delineamento inteiramente casualizado, três repetições por local e época de avaliação. A mortalidade foi verificada bimestralmente até 180 dias. Verificou-se o efeito dos tratamentos através da ANOVA e diferença... |
| Tipo: Journal paper |
Palavras-chave: Production systems; Farm nutrient management. |
| Ano: 2009 |
URL: http://orgprints.org/25287/1/Paix%C3%A3o_Controle.pdf |
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| Hossain, Shaikh Tanveer; Uddin, M. Jashim; Sugimoto, Hideki. |
| Our objective was to test the effectiveness of vermin compost as a substitute for inorganic fertilisers for sustainable, large-scale tomato production. The Green Revolution in Bangladesh promoted the indiscriminate use of factory fertilisers and pesticides to obtain better crop yields. Owing to poor soil management, the organic matter (OM) content is decreasing in some situations. The use of organic fertilisers along with effective soil management can restore soil OM and sustain soil health.Vermi-compost (VC) - mainly the excreta of earthworms - is rich in humus and nutrients. It also contains a lot of microorganisms beneficial to plant growth. As a soil amendment, VC may provide a tool for soil OM management. |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Crop husbandry; Soil; Farm nutrient management. |
| Ano: 2012 |
URL: http://orgprints.org/29186/7/29186.pdf |
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| Nauta, Wytze J.; Staps, J.J.M.. |
| Deze brochure schetst de mogelijkheden voor verbetering van de afzet van pluimveemest in de biologische productieketen. Basis hiervoor vormt het project Kippenmest en Kringloop dat in de periode 2007 - 2011 door het Louis Bolk Instituut is uitgevoerd. Pluimveehouders in Nederland zijn vaak weinig grondgebonden. Daarom moet de mest worden afgevoerd. Afzet is echter niet altijd eenvoudig. Dit komt omdat de samenstelling van pluimveemest niet optimaal is. Vooral de relatief lage N/P- verhouding speelt een goede afzet naar de akker- en tuinbouw parten. Kansen voor Pluimveemest toont dat er goede mogelijkheden zijn om tot een gunstiger N/P-verhouding te komen via de voersamenstelling. Ook via andere wegen kan de afzet van pluimveemest worden verbeterd. Dat kan... |
| Tipo: Report |
Palavras-chave: Composting and manuring; Poultry; Farm nutrient management. |
| Ano: 2011 |
URL: http://orgprints.org/19209/1/2476.pdf |
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| Briggs, Stephen. |
| This topic review aims to summarise knowledge and experience of Nitrogen supply and management in organic farming systems, including : Nitrogen fixation; Nitrogen recycling; the effect of the length of the fertility building phase or ley and the effect of green cover management; green manures – type and management; soil management; the impact of undersowing; seasonality of crops and the impact of manure use and management. It is based on a review of the organic research commissioned by Defra and that undertaken elsewhere and incorporates field experiences in the conclusions. |
| Tipo: Report |
Palavras-chave: Nutrient turnover; Farm nutrient management; Composting and manuring. |
| Ano: 2008 |
URL: http://orgprints.org/13557/1/Res_Review_2a_briggs.pdf |
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| Crossland, Mary; Westaway, Sally. |
| One challenge farmers face in planning cover crop systems is the dependence of cover crops on biophysical conditions such as soil type, rainfall, and climate. The performance of different cover crop species therefore varies according to geographic location and on-farm growing conditions. Farmers need a quick and effective way of identifying suitable species for their farm. Although farmer led assessment methods may not produce robust, quantifiable data, they do encourage farmers to actively engage in selecting species mixes adapted to on-farm conditions and to assess species performance with an increased level of detail and scrutiny than might otherwise be used. |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: "Organics" in general; Farm nutrient management. |
| Ano: 2015 |
URL: http://orgprints.org/29057/1/OSCAR%20Task%203.5%20Poster.pdf |
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| Cormack, Dr W F. |
| Project OF0112 contributes to MAFF's main policy focus of encouraging conversion to organic farming methods. It is part of a long term rotational study that began in 1990 as OF0102 and has recently been extended to 2001 as OF0145. The overall objective of these three projects is to evaluate the cost of conversion to organic arable production on a fertile soil, to assess the physical and financial performance of the organic rotation, to identify and overcome limitations to sustainabilty and to compare the results with conventional arable production. The project comprises a field-scale unreplicated systems comparison and associated replicated experiments at ADAS Terrington, and a financial analysis of ten commercial 'linked' organic farms. The silty... |
| Tipo: Report |
Palavras-chave: Nutrient turnover; Production systems; Farm nutrient management. |
| Ano: 1998 |
URL: http://orgprints.org/9929/1/organic_arable_systems_at_adas_terrington_of0112.pdf |
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| Registros recuperados: 641 | |
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