Partial substitution of nitrogenous fertilizer through organics enhances yield, nutrients uptake and physiological characteristics of transplanted rice (Oryza sativa L.)

A field experiment was conducted to explore the possibility of substituting fertilizer N with organic manure and bio-fertilizers (Blue Green Algae) in an integrated manner. The experiment was conducted in a randomized block design with 12 different Integrated Nutrient Management (INM) modules with 3 replications involving different levels of nitrogen. All the treatments increased the yield and nutrient uptake significantly over the control. The highest paddy yield (50.51 q ha^-1) and uptakes of N and K by plants were recorded in plot where 25% N through green manure + 75% through chemical fertilizer were applied. Similar trend was observed in case of leaf area index at 45 and 90 days after transplanting (DAT) and dry matter accumulation at harvest stage. The maximum uptake of P was recorded in 25% N through Poultry manure + 75% N through Fertilizer. The physiological efficiency of NPK were higher with the application of 100% N through fertilizer.