THE USE EFFICIENCIES OF SULPHUR AND BORON AS INFLUENCED BY LIMING AND CROP PRODUCTION ECONOMICS IN A RAPESEED-GREENGRAM CROPPING SEQUENCE IN NORTH BANK PLAIN ZONE OF ASSAM

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Research was conducted to study the effect of S, B and lime application on nutrient use efficiencies and production economics in a rapeseed-greengram cropping sequence. The direct effect of S, B and lime application was studied in rapeseed and residual effect was assessed in greengram. The experiment was conducted during rabi and summer seasons of 2019-20 and 2020-21 at the Instructional farm of KVK, Udalguri, Assam Agricultural University, Assam. The design of the experiment was factorial RBD with two factors [limed (L) and unlimed (L0)] and four levels of S and B (S0B0, S15B0.75, S20B1.0 and S25B1.25 kg ha-1 ) and three replications. The recommended doses of NPK were applied to both the crop while S, B and lime were applied only to rapeseed crop. The soils of the experimental site was sandy loam in texture, moderately acidic with high organic carbon content, medium in available N and K and low in available P, S and B level. S use efficiencies in terms of Agronomic Efficiency (AE) were found best in LS15 and L0S15 for rapeseed and greengram respectively, Recovery efficiency (RE) was found best in LS15 for both the crops, Apparent nutrient recovery (ANR) was found best in LS20 for both the crops and Physiological efficiency (PE) was reported best in LS15 and L0S15 for rapeseed and greengram respectively. B use efficiencies in terms of AE were found best in L0B0.75 and LB0.75 for rapeseed and greengram respectively, RE was found best in LB0.75 for both the crops, ANR was found best in LB1.25 for both the crops and PE was reported best in LB0.75 for both the crops. Hence the treatment LT2 (S15B0.75) was found best treatment in a rapeseed-greengram cropping sequence. In economic expressions, the highest gross return, net return and B: C ratio was found under treatment LT3 in both rapeseed and succeeding crop greengram. Among both the crops, higher net return (Rs. 32368.38) and B:C ratio (2.44) was recorded on succeeding greengram crop. The S, B and lime application showed a clear impact on the comparative economics of rapeseed-greengram cropping sequence with highest gross return (Rs. 105930.00), net return (Rs. 61000.00), equivalent yield(9.46q ha-1 ) and B: C ratio (2.36) in treatment LT3. Considering the positive effect on economic returns, application of 20kg S+1.0kg B+490kg lime ha-1 along with recommended dose of NPK was found superior for rapeseed-greengram cropping system.

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