Agronomic response of soybean to first and second cropping season cultivation in different agro-climatic zones in Sierra Leone
Paper Details
Agronomic response of soybean to first and second cropping season cultivation in different agro-climatic zones in Sierra Leone
Abstract
Field experiments were conducted in 2012 and 2013 rainy season to evaluate the agronomic response of soybean to first and second cropping season cultivation in different agro-climatic zones in Sierra Leone. The experimental design was a randomized complete block in a split-plot arrangement with three replications. Cropping seasons (first and second) and soybean genotypes (TGx 1448-2E and TGx 1904-6F) were considered as the main and subplots respectively. Soybean seeds were planted on June 28 in the first season and September 05 in the second season. In both years, cropping season had a significant effect (p < 0.05) on the agronomic traits of soybean in all the locations. Shifting soybean cultivation from the first to second cropping season significantly decreased field emergence by 40.5-47.4%, number of nodules per plant by 28.6-32.5%, above-ground biomass by 42.5-49.1%, maturity by 11-14 DAP, grain yield by 57.8-64.5% and seed size (small seeds: seed size factor > 21). However, germination percentage significantly increased by 102.7-127.7%. Based on these results, cropping season posed a trade-off between first season producing better plant growth and high grain yield and second cropping season producing good seeds. For grain and seed production, cultivation of soybean in different agro-climatic zones in Sierra Leone should be done in the first and second cropping season respectively.
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