G x E interaction of semi- erect cowpea genotypes
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Date
2005
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Department of Olericulture, College of Horticulture, Vellanikkara
Abstract
Experiments on “G x E interaction of semi-erect cowpea genotypes” were carried out at the Department of Olericulture, College of Horticulture, Kerala Agricultural University, Vellanikkara, Thrissur during Kharif, Rabi and summer 2004-2005. The study was aimed at identification of stable high yielding and dual purpose semi-t rect cowpea accessions over different seasons and to assess the G x E interaction with respect to different characters. Fifty, accessions of cowpea collected from various parts of Kerala were used for the study. The analysis of variance revealed considerable variability for most of the characters among the genotypes. The magnitude of PCV was higher for green pod yield per plant (42.13 %), number of pods per plant (35.75 %) and seed yield per plant (35.33 %). Heritability values of more than 60 per cent was ■'"* TT* noticed for characters like 100 seed weight, pod length, seed yield per plant, green pod yield per plant, number of pods per plant, number of seeds per pod and number of clusters per plant. The pest and disease infestation scenario during cultivation showed that the accession VS-1 111 had a pod borer infestation below 2 per cent and can be progressed further as a resistant material for future programmes. The coreid bug infestation was maximum during summer followed by Kharif and was nil during Rabi. None of the accessions were found resistant to coreid bug. The incidence of aphids was lowest during Kharif followed by summer and Rabi. The accessions VS-1230 and VS-1231 were free from aphid attack during all the seasons. There was no incidence of anthracnose during Rabi season. VS- 1294, VS-1047, VS-1171, VS-1286 (Varun), VS-1276 (Kanakamony), VS- 1179, VS-1213; VS-1160, VS-1263, VS-1032, VS-1266 (Kairali) and VS-1248 were free from anthracnose. The incidence of collar rot was lowest during summer followed by Kharif, and Rabi. There was no incidence of mosaic during Rabi.
The performance of the accessions was the best during summer followed by kharif. The productivity was maximum in VS-1177 (green pod yield of 9,5 tonnes and a seed yield of 3.3 tonnes per hectare) followed by VS- 1025 (green pod yield of 6.9 tonnes and a seed yield of 2.1 tonnes per hectare)and VS-1179 (green pod yield of 6.2 tonnes and a seed yield of 2.3 tonnes per hectare). Considering the performance over three seasons, the above accessions were found adaptable for green pod yield and seed yield. Hence these accessions can be selected as dual purpose, adaptable, semi-erect cowpea for large scale cultivation throughout the year in Kerala and can be recommended after further experimentation.
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