Influence of Sowing Seasons and Inter-plant Spacing on the Performance of Soybean [Glycine max (L) Merill]

Field experiments were conducted during rainy and winter seasons of 2013 and 201314, respectively for two consecutive seasons at research farm of Regional Sugarcane and Rice Research Station, Rudrur to evaluate the effects of different cropping seasons and inter-plant spacing on performance of soybean genotypes. Higher seed yields were recorded during rainy season as compared to winter season as lower thermal heat units were recorded during winter season for both 50% flowering and maturity. Grain yield showed no significant difference under different inter-plant spacing. Branches plant⁻¹ and clusters plant⁻¹ showed significant variation under different inter-plant spacing and an inter-plant spacing of 10 cm recorded highest branches plant⁻¹ and clusters plant⁻¹. The number of pods plant⁻¹ which is a decisive character for seed yield showed significant variation among different inter-plant spacing in both rainy season and winter season and an inter-plant spacing of 10 cm recorded highest number of pods plant⁻¹. Among genotypes Basar recorded highest grain yield during rainy season and JS-93-05 during winter season. The rainy season crop recorded higher gross returns, net returns and B:C ratio when compared to winter season crop. Among different spacings a spacing of 30×10 cm² was economically feasible as it recorded highest B:C ratio. Hence cultivation of soybean during winter season in Northern Telangana Zone is not advisable as it is not economically feasible.