Performance of erect growing cowpea (Vigna unguiculata (L.) walp.) varieties in Zimbabwe
1990
Naik, D.M. (SADCC, Maputo (Mozambique). SADCC CowpeaResearch Project) | Mukoko, O.Z. | Nleya, T. (Ministry of Lands, Agriculture and Rural Resettlement, Harare (Zimbabwe). Dept. of Research and Specialist Services)
Erect growing cowpea varieties described as early and medium maturing in Nigeria were evaluated in randomized complete blocks with four replications at Gwebi Variety Testing Centre and Panmure Experiment Station in Zimbabwe between 1986 and 1988. The influence of location on the behaviour of two early and two medium maturity varieties was investigated at Gwebi and Muzarabani during 1986. The effect of insecticide and planting date on two early maturing varieties was investigated at Panmure during 1987. Seed yields and days to physiological maturity of the varieties varied during 1987 and 1988. The period to maturity of the two sets of varieties was similar and their original designation as early and medium maturing did not hold true in Zimbabwe. Yields in excess of 2 000 kg/ha were attained in the first season at Gwebi. Early varieties performed better than medium varieties, and early varieties, IT82D-789, IT82D-889, and IT83D-442, were consistently among the high yielders over two seasons. Flowering and physiological maturity, respectively, were attained three and five weeks earlier at Muzarabani compared to Gwebi, with IT82-889 maturing in only 54 days at Muzarabani. Application of dimethoate improved pod production per plant and increased seed yield by almost 40 per cent, over unsprayed plots, while sowing in early February compared to early January resulted in higher seed yields
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