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Relative Sowing Time and Density of Component Crops in a Maize/Cowpea Intercrop System

Published online by Cambridge University Press:  03 October 2008

Francis Ofori  and
W. R. Stern
Francis Ofori
Affiliation:
Agronomy Group, School of Agriculture, University of Western Australia, Nedlands, WA 6009
W. R. Stern
Affiliation:
Agronomy Group, School of Agriculture, University of Western Australia, Nedlands, WA 6009
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Summary

The effect of variations in the relative sowing time and density of component crops in a maize/cowpea intercrop were examined in two experiments. In the first experiment, maize and cowpea were sown together, and either 10 or 21 days before or after each other. Maize yield was reduced when sown at the same time or after cowpea; intercrop cowpea yields were less than sole cowpea yields at all sowings. In the second experiment, maize densities of 35, 50 and 70 × 103 plants ha−1 were combined with cowpea densities of 70, 100 and 140 × 103 plants ha−1. Increasing the density of either crop in the mixture resulted in increases in total yield. Maize reduced cowpea yields more than the effect of cowpea on maize yields. In terms of LER and total seed protein yield, there was no advantage of either staggered sowings over simultaneous sowing or of the various intercrop density combinations, except between the lowest and the highest densities of either maize or cowpea. The LERs appeared to follow the trends in cowpea yields and total seed protein yields the trends in maize yields.

Type
Research Article
Information
Experimental Agriculture , Volume 23 , Issue 1 , January 1987 , pp. 41 - 52
Copyright
Copyright © Cambridge University Press 1987

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