Journal of FARM SCIENCES, Vol 30, No 1 (2017)

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Site specific nutrient management stragies in Bt cotton

K. S. SHIVARAJA, G. S. YADAHALLI, G. Y. VIDYAVATHI, B. K. DESAI, H. S. LATHA

Abstract


The field experiment was conducted during 2014-15 at College of Agriculture, Bheemarayanagudi, under UKPCommand, which lies in North Eastern Dry Zone of Karnataka. The field trial was laid out in Factorial RCBD with fourSSNM approaches for varied targeted yield, two leaf reddening management practices and one single control as RDF withthree replications. Among the nutrient levels, SSNM yield target of 6 t ha-1 was recorded significantly higher seed cottonyield (4274 kg ha-1) was superior over SSNM yield target @ 3 t ha-1 (3507 kgha-1). However, it was on par with SSNM yieldtargets of 5 and 4 t ha-1. The increase in seed cotton yield with SSNM yield target of 6 t ha-1 over RDF and SSNM yieldtargets of 3, 4 and 5 t ha-1 was 64.19, 21.87, 2.12 and 0.85 per cent, respectively. Significantly highest net returns and B: Cratio was obtained with SSNM yield target of 4 t ha-1 (` 130260 ha-1 and 4.12 respectively) and was superior over otherSSNM yield target treatments. However, the superior treatment was alone found on par with SSNM yield target of 5 t ha-1with respect to net returns (` 129057 ha-1).

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