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Field experiments was carried out in Zonal Agricultural and Horticultural Research Station, Bavikere, Chikkamagalore, Karnataka during 2019-20. Identify the most suitable variety, suitable sowing time and subsequent interaction on nutrient uptake and yield production in rainfed soybean in red sandy loam soils. There were four dates of sowing viz., June II fortnight (D1), July I fortnight (D2), July II fortnight (D3), August I fortnight (D4) and three varieties of soybean viz.,, DSb-21, JS-335 and JS 93-05. The results shown that among the different dates of sowing at (D1) June II fortnight recorded significant uptake compared to other sowing dates. Among the different varieties DSb-21 recorded the highest nutrient uptake followed by JS-335. The yield obtained among the different date of sowing has found to be better with D1-June II fortnight and it would give 7.5, 26.94, 39.4 % more yield in soybean as compared to later sowing dates (D2, D3 and D4 respectively). This study concluded that delay in sowing will reduce the nutrient uptake, dry matter production and yield irrespective of the varieties. Among the varieties highest yield was recorded by the variety DSb-21 irrespective of the sowing date. and hence under delayed sowing conditions the variety DSb-21 is preferred over other varieties.

Effect of sowing date and soybean varieties on nutrient uptake studies in southern transition zone of Karnataka