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| Registros recuperados: 11 | |
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| Doltra, Jordi; Olesen, Jørgen Eivind. |
| The contribution of catch crops to the ecological intensification of organic arable systems was investigated using data of a 12-year field experiment carried out at three sites in Denmark. This study focused on the yields of spring oats and spring barley in systems with and without manure in two different cropping systems that differed in the proportion of legume-based catch crops (O2 lower and O4 higher) and in the rotation composition (grass-clover green manure in O2 and pulse crops in O4). Three consecutive four-year crop rotations were established at three locations representative of the different soil types (loamy sand, sandy loam and coarse sand) and climatic conditions. Crop management and soil operations were performed following common practices... |
| Tipo: Journal paper |
Palavras-chave: Crop combinations and interactions Cereals; Pulses and oilseeds. |
| Ano: 2013 |
URL: http://orgprints.org/18765/4/18765.pdf |
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| Olesen, Jørgen Eivind. |
| Produktion og forbrug af fødevarer er ansvarlig for et betydeligt bidrag til de globale udslip af driv-husgasser. Udslippene skyldes direkte udledninger af drivhusgasserne metan (CH4) og lattergas (N2O) i forbindelse med produktionen. Disse drivhusgasser har henholdsvis 21 og 310 gange krafti-gere drivhuseffekt end CO2. Drøvtyggernes fordøjelse er den største enkeltkilde til metan udled-ning, desuden kommer der metan fra gødningslagrene. Lattergas dannes, når kvælstof omdannes ved mikrobielle processer i jorden. Derfor øges udslippet af lattergas, når jorden tilføres kvælstof-gødninger. Landbruget har endvidere et energiforbrug (direkte og indirekte), som også bidrager til udledning af CO2. |
| Tipo: Report chapter |
Palavras-chave: Recycling; Balancing and resource management Air and water emissions. |
| Ano: 2010 |
URL: http://orgprints.org/18507/1/18507.pdf |
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| 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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| Olesen, Jørgen Eivind; Askegaard, Margrethe; Rasmussen, Ilse A.. |
| The effect of nitrogen (N) supply through animal and green manures on grain yield of winter wheat and winter rye was investigated from 1997 to 2004 in an organic farming crop rotation experiment in Denmark on three different soil types varying from coarse sand to sandy loam. Two experimental factors were included in the experiment in a factorial design: 1) catch crop (with and without), and 2) manure (with and without). The four-course crop rotation was spring barley undersown with grass/clover - grass/clover - winter wheat or wheat rye - pulse crop. All cuttings of the grass-clover were left on the soil as mulch. Animal manure was ap-plied as slurry to the cereal crops in the rotation in rates corresponding to 40% of the N de-mand of the cereal crops.... |
| Tipo: Journal paper |
Palavras-chave: Nutrient turnover; Crop combinations and interactions. |
| Ano: 2009 |
URL: http://orgprints.org/16309/1/16309.pdf |
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| Registros recuperados: 11 | |
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