Loges, Ralf; Kaske, A. and Taube, F. (1999) Dinitrogen fixation and residue nitrogen of different managed legumes and nitrogen uptake of subsequent winter wheat [N2-Fixierung und residualer Stickstoff verschiedener Futterleguminosen sowie N-Aufnahme der Folgefrucht Winterweizen.]. In: Olesen, J.E.; Eltun, R.; Gooding, M.J.; Jensen, E.S. and Köpke, U. (Eds.) Designing and testing crop rotations for organic farming, DARCOF Report, no. 1, pp. 181-190.
Fixed nitrogen accumulated by legumes is the main nitrogen source for organic farming systems. Knowledge about the amount of fixed nitrogen, its pathways into forage yield, crop residues, soil-N and yield formation of the following crop is needed for designing crop rotations.
Two field experiments were conducted in Northern Germany with differently managed (cut, mulched) legumes (red clover, alfalfa, white clover) in pure stands and various mixtures with two companion grasses (Lolium multiflorum, Lolium perenne) have been grown to determine N2-fixation, residue nitrogen and N-uptake of subsequent crops.
Cropped grass/legume reached higher N2-fixation than mulched. While green manure grass/legume left up to 280 kg ha-1 of N in mulch, stubble and roots on the field, most cropped grass/legume mixtures left less than 110 kg N ha-1 in crop residues. Pure legume swards or legume rich mixtures showed higher N2-fixation than grass rich mixtures. N-uptake in late autumn and at maturity of the subsequent wheat was strongly correlated to the legume content in DM-yield.
|EPrint Type:||Conference paper, poster, etc.|
|Type of presentation:||Paper|
|Keywords:||N2 Fixation, legumes, winter wheat,|
|Subjects:|| Soil > Nutrient turnover|
Crop husbandry > Crop combinations and interactions
Crop husbandry > Production systems > Cereals, pulses and oilseeds
|Research affiliation:|| Denmark > DARCOF I (1996-2001) > III Development of organic plant production systems|
Germany > Universität Kiel > Department of Crop Production and Plant Breeding > Grassland and Forage Production/Organic Farming
|Deposited By:||Loges, Dr. Ralf|
|Deposited On:||29 Jan 2004|
|Last Modified:||12 Apr 2010 07:28|
|Refereed:||Peer-reviewed and accepted|
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