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	Provedor de dados Organic Eprints (2) Autor Askegaard, Margrethe (2) Olesen, Jørgen E. (2) Eriksen, Jørgen (1) Rasmussen, Ilse A. (1) Palavra-chave Pulses and oilseeds Air and water emissions Composting and manuring (2) Cereals (1) Nutrient turnover Crop combinations and interactions Cereals (1) Tipo do documento Conference paper, poster, etc. (1) Journal paper (1) Ano 2008 (1) 2003 (1) País Germany (2)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última Nitrogen use efficiency of cereals in arable organic farming Organic Eprints Olesen, Jørgen E.; Rasmussen, Ilse A.; Askegaard, Margrethe. The effect of nitrogen (N) supply and weeds on grain yield of spring barley, winter wheat and winter rye was investigated from 1997 to 2004 in an organic farming crop rotation experiment in Denmark on three 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 apparent recovery efficiency of N in grains (nitrogen use efficiency, NUE) from NH4-N in applied manure varied from 29 to 38% in spring barley and from 23 to 44% in winter cereals. The NUE of above-ground N in catch crops sampled in November prior to the spring barley varied from 16 to 52% with the largest value on the coarse sandy soil and the smallest... Tipo: Conference paper, poster, etc. Palavras-chave: Cereals; Pulses and oilseeds Air and water emissions Composting and manuring. Ano: 2008 URL: http://orgprints.org/14690/1/Paper_ISOFAR2.pdf Exchangeable potassium and potassium balances in organic crop rotations on a coarse sandy soil Organic Eprints Askegaard, Margrethe; Eriksen, Jørgen; Olesen, Jørgen E.. Crops on sandy soils (<5% clay) are exposed to K deficiency due to the small release and high leaching losses of K. Reliable tools are needed to improve the K management in cropping systems with limited K input, such as organic farming where import of nutrients are restricted according to the EC regulations. We investigated K balances and exchangeable K (Kexch) changes in an organic crop rotation experiment. Potassium leaching decreased from 42 kg ha-1 in 1998/99 to 21 kg ha-1 in 2000/01 as an average of a crop rotation (spring barley, grass-clover, winter wheat and pea/barley) with manure application and without catch crops. In the same period, spring Kexch decreased from 5.0 to 3.0 mg K 100 g-1 soil (0-20 cm). The retention of the straw K left in the... Tipo: Journal paper Palavras-chave: Nutrient turnover Crop combinations and interactions Cereals; Pulses and oilseeds Air and water emissions Composting and manuring. Ano: 2003 URL: http://orgprints.org/3898/1/3898.pdf Registros recuperados: 2 Primeira ... 1 ... Última

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