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Title: Causes of legume-rotation effects in increasing cereal yields across the Sudanian, Sahelian and Guinean zone of West Africa
Authors: Bürkert, AndreasBagayoko, M.Alvey, S.Bationo, A.
???metadata.dc.subject.swd???: WestafrikaGetreideFruchtfolgeHülsenfrüchtlerErtragssteigerung
???metadata.dc.subject.ddc???: 630 - Landwirtschaft, Veterinärmedizin (Agriculture)
Issue Date: 2001
Publisher: Horst, Walter J. (u.a.) (Hrsg.)
Citation: In: Horst, Walter J. (Hrsg.): Plant nutrition : food security and sustainability of agro-ecosystems through basic and applied research. Dordrecht : Kluwer, 2001. S. 972-973
Series/Report no.: Developments in plant and soil sciences92
Abstract: On-farm experiments and pot trials were conducted on eight West African soils to explore the mechanisms governing the often reported legume rotation-induced cereal growth increases in this region. Crops comprised pearl millet (Pennisetum glaucum L.), sorghum (Sorghum bicolor Moench), maize (Zea mays L.), cowpea (Vigna unguiculata Walp.) and groundnut (Arachis hypogaea L.). In groundnut trials the observed 26 to 85% increases in total dry matter (TDM) of rotation cereals (RC) compared with continuous cereals (CC) in the 4th year appeared to be triggered by site- and crop-specific early season differences in nematode infestation (up to 6-fold lower in RC than in CC), enhanced Nmin and a 7% increase in mycorrhizal (AM) infection. In cowpea trials yield effects on millet and differences in nematode numbers, Nmin and AM were much smaller. Rhizosphere studies indicated effects on pH and acid phosphatase activity as secondary causes for the observed growth differences between RC and CC. In the study region legume-rotation effects on cereals seemed to depend on the capability of the legume to suppress nematodes and to enhance early N and P availability for the subsequent cereal.
URI: urn:nbn:de:hebis:34-2007041017627
ISBN: 0-7923-7105-4
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