The effects of plant density on lthe growth, development and grain yield of two varieties of cowpea, Vigna unguiculata (L) Walp
1972
Haizel, K.A., Department of Crop Production, Legon (Ghana)
Two cultivars of cowpeas, Arauca, a spreading type and Black Mottled, a locally selected bunched type, were compared at different densities separately in two successive major cropping seasons in 1970 and 1971 respectively. Arauca was grown at three densities and Black Mottled at six densities represented by various square and rectangular planting systems. Arauca was harvested twice, at flowering and at fruiting. Black Mottled was harvested once at maturity. Arauca showed a tendency to perenniality, had a low pod/stem ratio and a protracted phase of fruiting and therefore seemed less efficient for grain production, but perhaps more suitable for fodder and for cover. Black Mottled showed a higher pod/stem ratio, flowered and matured uniformly and seemed more efficient and more suitable for grain production. At high densities Black Mottled produced a smaller number of pods, and mean seed size was significantly increased. The rate of increase in yield was greatest with square planting than with rectangular planting.
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