Enhancing Yield and Economic Returns in Blackgram Through Sustainable Phosphorus Management with Nano-DAP

Abstract

A field experiment was conducted during the kharif season of 2023 at the Research Farm, College of Agriculture, OUAT, Bhawanipatna, to evaluate the effects of nano-DAP in combination with conventional phosphorus fertilization on growth, yield, and economic returns of blackgram (Vigna mungo L.). The study was laid out in a randomized complete block design with three replications, comprising eight treatments: T1—control; T2—100% RDF (20:40:20 N:P₂O₅:K₂O kg/ha); T3—75% RD P₂O₅ through DAP + nano-DAP spray at 25 DAS; T4—50% RD P₂O₅ through DAP + nano-DAP sprays at 25 and 40 DAS; T5—25% RD P₂O₅ through DAP + nano-DAP sprays at 25, 40, and 55 DAS; T6—75% RD P₂O₅ + seed treatment with nano-DAP; T7—50% RD P₂O₅ + seed treatment + nano-DAP spray at 25 DAS; and T8—25% RD P₂O₅ + seed treatment + nano-DAP sprays at 25 and 40 DAS. These findings demonstrate that nano-DAP can partially substitute conventional phosphorus fertilization, maintaining high productivity and economic returns, and offer a sustainable nutrient management strategy for P-deficient or P-fixing soils in blackgram cultivation.