Studies on Integrated Nutrient Management in Paddy Groundnut Cropping Sequence for Coastal Zone of Karnataka

Abstract

Field experiments were conducted from 2014 to 2016 at ZAHRS, Brahmavar, Udupi to study the effect of integrated nutrient management in paddy-groundnut and groundnut-paddy cropping sequence. Soil type is sandy loam in texture pH in acidic (4.62 and 4.78), high in organic carbon content (1.38 and 1.32 %), medium in available nitrogen and potassium (348.70 and 362.84 and 106.80 and 113.61 kg ha-1, respectively) and high in available phosphorus (59.10 and 56.28 kg ha-1) in both the experiments, respectively. The experiment was laid out in RCBD with twelve treatments replicated thrice. The treatments comprised of recommended nutrient practice (POP) and absolute control for comparison along with supplemental addition of 25 and 50 per cent recommended dose of nitrogen through eupatorium, gliricidia, vermicompost, poultry manure and goat manure, respectively. newlineIn paddy-groundnut cropping sequence significantly higher paddy grain yield (5293 kg ha-1) was realized with POP + 50 per cent RDN through vermicompost. The residual effect of POP + 50 per cent RDN through poultry manure applied to paddy in kharif on rabi groundnut resulted in significantly higher pod and kernel yield (1498 and 1075 kg ha-1, respectively) over package of practice. Similarly, in groundnut-paddy cropping sequence with the application of recommended nutrients (POP) + 50 per cent RDN through poultry manure treatment recorded significantly higher pod and kernel yield (2272 and 1665 kg ha-1, respectively) in groundnut during rabi and paddy grain yield (3623 kg ha-1) in subsequent kharif paddy crop. Higher net returns and benefit cost ratio (Rs. 1, 05,944 ha-1 and 2.18 and Rs. 1, 05,024 ha-1 and 2.09, respectively) in paddy-groundnut and groundnut-paddy sequence were realized with the POP + 50 per cent RDN through poultry manure treatment as compared to package of practice (Rs. 57,573 and 1.58 and 60,304 and 1.64 ha-1, respectively). newline newline