RESPONSE OF MAIZE TO PLANTING DENSITIES AND INCORPORATION METHODS OF PRECEDING COWPEA GREEN MANURE IN A DERIVED SAVANNAH ECOLOGY OF NIGERIA

Le résumé fourni par la source

A field trial was conducted in the University of Agriculture, Abeokuta, a derived savannah ecological zone of Nigeria, between April to September, 2009 and March to August, 2010 to evaluate the response of succeeding maize to planting density and application methods of preceding cowpea green manure. The green manure was established in a 2 A— 3 factorial experiment arranged in a Randomized Complete Block design RCBD. There were three populations densities/ha of cowpea: 30cmA—60cm(55,555), 30cmA—30cm(111,111) and 30cmA—15cm(222,222) and either incorporated or left as mulched six weeks after planting. One week after, maize variety, SUWAN1-SR was planted on all plots and a control plot. Biomass from population densities of 111,111 and 222,222 were similar (p>0.05) and higher (p 0.05) and significantly higher (p 0.05); highest grain yield (p>0.05) were obtained from treatments with both incorporated and mulched cowpea at 222,222 plants/ha. Grain yield of maize from all green manure plots were also higher (p>0.05) than the control plots. It was concluded that 111,111 plants/ha of Oloyin was the optimum for biomass production at 6 weeks after planting, for green manuring. Incorporating preceding cowpea green manure increased grain yield of succeeding maize. Growing cowpea at higher population density cannot make up for the losses of nutrient that would occur if the green manure is not incorporated. Â

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