Browse on keywords: crop rotation rotation effect
Search results on 05/24/13
2507. Heichel, G.H.. 1987. Legumes as a source of nitrogen in conservation tillage systems.. IN: J.F. Power (ed.) The role of legumes in conservation tillage systems..
A review of legume N contributions in crop rotations across the U.S. Covers nitrogen nutrition of legumes, legume nitrogen and companion plants, management effects, nonlegume yield response. T: examples of regional rotations with legumes; seasonal N fixation for various crops in various locations; N transfer from legume to grass; N budgets; N recovery.
10098. Reeves, T.G., A. Ellington and H.D. Brooke. 1984. Effects of lupin-wheat rotations on soil fertility, crop disease and crop yields.. Austral. J. Expt. Animal Husb. 24:595-600..
Three experiments were conducted between 1974 and 1979 in northeastern Victoria to investigate the effects of rotating wheat and sweet lupins on crop yields, soil fertility and crop diseases. The grain yield of continuous wheat was 2.58 t/ha and of continuous lupins 0.66 t/ha. Wheat, grown after a lupin crop, yielded 750 kg/ha more than wheat after wheat, and a second wheat crop, after lupins, yielded 420 kg/ha more than a third successive wheat crop. Lupins, grown after wheat, yielded 50-165% more than lupins after lupins. Grain N of wheat was significantly increased after lupins. Differences in soil mineral N were apparent ten weeks after sowing, with mean N levels of 37 and 55 kg/ha under wheat and lupins, respectively. Soil mineral N was consistently greater after lupins than after wheat. Overall, mean accretion of mineral N under lupins was 41 kg/ha/year. Lupins after lupins suffered severly from brown leaf spot, up to 63% of plants being infected compared with only 18% after wheat. Disease incidence in wheat (mainly G. graminis) increased from less than 1% in the first year of cropping, to 36% infection in year 3 of continuous wheat. When wheat was grown after lupins, disease incidence was negligible.