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Cereal yield and quality as affected by N availability in organic and conventional crop rotations in Denmark: a combined modeling and experimental approach Organic Eprints
Doltra, Jordi; Lægdsmand, Mette; Olesen, Jørgen Eivind.
The effects of nitrogen (N) availability related to fertilizer type, catch crop management, and rotation composition on cereal yield and grain N were investigated in four organic and one conventional cropping systems in Denmark using the FASSET model. The four-year rotation studied was: spring barley–(faba bean or grass-clover)– potato–winter wheat. Experiments were done at three locations representative of the different soil types and climatic conditions in Denmark. The three organic systems that included faba bean as the N fixing crop comprised a system with manure (stored pig slurry) and undersowing catch crops (OF+C+M), a system with manure but without undersowing catch crops (OF−C + M), and a system without manure and with catch crops (OF + C−M). A...
Tipo: Journal paper Palavras-chave: Cereals; Pulses and oilseeds Air and water emissions.
Ano: 2011 URL: http://orgprints.org/18764/1/18764.pdf
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Effects of catch crop type and root depth on nitrogen leaching and yield of spring barley Organic Eprints
Sapkota, Tek Bahadur; Askegaard, Margrethe; Lægdsmand, Mette; Olesen, Jørgen Eivind.
Catch crop root growth and nitrogen (N) uptake from both shallower and deeper soil layers is important for N management in arable farming system particularly in climates where excess winter precipitation induces N leaching. We simulated the root growth and biomass yield of three common catch crops [chicory (Cichorium intybus L.), fodder radish (Raphanus sativus L.) and perennial ryegrass (Lolium perenne L.)] and their effect on soil mineral N in different soil layers by using the FASSET model. The simulated results of catch crops root growth and mineral N in the soil profile were validated against two years (i.e. 2006 and 2007) of observations taken in Foulum and Flakkebjerg, Denmark. Fodder radish had the deepest root system and depleted N from deeper...
Tipo: Journal paper Palavras-chave: Crop combinations and interactions Cereals; Pulses and oilseeds Air and water emissions.
Ano: 2011 URL: http://orgprints.org/18766/1/18766.pdf
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SIMULATING WINTER WHEAT YIELD AND NITROGEN LEACHING FROM ORGANIC AND CONVENTIONAL CROP ROTATIONS Organic Eprints
Doltra, Jordi; Ølsen, Jørgen E.; Lægdsmand, Mette.
This work evaluates the effects of growing a green manure crop or a legume crop in winter wheat yield and on nitrate leaching, in an irrigated crop rotation. Results are also compared with a conventional cropping system. Simulations with the field version of the FASSET model (Berntsen et al., 2003) were done to evaluate the performance of the model to predict winter wheat dry matter yield. The simulated leaching from the different cropping systems was evaluated during the rotation period.
Tipo: Conference paper, poster, etc. Palavras-chave: Crop health; Quality; Protection Crop combinations and interactions Cereals; Pulses and oilseeds Air and water emissions.
Ano: 2009 URL: http://orgprints.org/16153/2/16153.pdf
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