Residual effect of Integrated Nutrient Management practices on growth and yield of rice fallow blackgram (Vigna mugno L.)

Field investigations were carried out in rice - blackgram relay cropping system at the Experimental farm, Department of Agronomy, Annamalai University, Annamalainagar, which represents the tail end area of Cauvery Deltaic Zone of Tamil Nadu, India, to study the residual effect of integrated nutrient management practices on growth and yield of rice fallow blackgram. The experiments were laid out in randomized block design with three replications. The treatments were imposed to rice crop. The treatments comprised of integrated application of 75% recommended dose of N through fertilizer and 25% N through various organic manures (FYM, cow dung based vermicompost, cow dung and water hyacinth based vermicompost, enriched poultry manure compost, enriched coirpith compost, green manures and green leaf manures) with recommended dose of P and K were evaluated with farmers’ practice and absolute control under. The residual effect of integrated nutrient management practices on growth, yield attributes, yield of fallow blackgram was recorded. Among the different combinations, residual effect of 75 % RDN through fertilizer + 25 % N through vermicompost (75 % Cd + 25 % Wh) had strikingly impressive effect on growth, yield attributes, seed yield and haulm yield of blackgram. NPK uptake by the crop was also increased in this treatment. This treatment was statistically on par with the application of 75 % RDN through fertilizer + 25 % N through vermicompost (100 % Cd) to rice.