Temporal optimisation of sowing windows for enhancing off-seasonsoybean (Glycine max) seed yield
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Keywords:
Erratic rainfall, Phenological parameters, Seed production, Sowing timeAbstract
The seed production and quality of soybean (Glycine max L.) gets affected due to erratic rainfalls during the season, leading to exploration in off-season cultivation to meet out the demand. Therefore, the experiment was conducted to identify the optimal sowing window for off-season seed production of soybean during the years 2022–23 and 2023–24 in the North Eastern Dry Zone of Karnataka. The experiment was laid out in a split-plot design with three replications, comprising two varieties (JS 335 and DSB 21) and six sowing dates. Results revealed that sowing during the first fortnight of November (D1) consistently recorded superior performance in both the years and pooled analysis. This treatment significantly improved key phenological parameters, including longer duration from planting to one open flower at any node on the main stem, extending reproductive phase (R1: Beginning bloom to R8: Full maturity), and higher days to 50% flowering in both varieties. The favourable growth period under D1 contributed to better crop development and efficient resource utilisation. Consequently, the highest seed yield/plot was also recorded under this sowing window, with JS 335 outperforming DSB 21. Therefore, it can be concluded that sowing soybean during the first fortnight of November may be the most suitable window for off-season seed production in the North Eastern Dry Zone of Karnataka, ensuring better growth and higher seed yield.
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