Enhancing Yield and Economic Returns in Blackgram Through Sustainable Phosphorus Management with Nano-DAP
Tejaswini Chandrakar *
Agronomy Section, ICAR-National Dairy Research Institute, Karnal, 132001, India.
Lakshmi Kanta Das
Department of Agronomy, College of Agriculture, Odisha University of Agriculture and Technology, Bhawanipatna, Kalahandi, Odisha, 766001, India.
Tarini Prasad Das
Department of Agronomy, College of Agriculture, Odisha University of Agriculture and Technology, Bhubaneswar, Odisha, 751003, India.
Kamsali Sukeswara Achari
Agronomy Section, ICAR-National Dairy Research Institute, Karnal, 132001, India.
Anand Jejal
Agronomy Section, ICAR-National Dairy Research Institute, Karnal, 132001, India.
Manjunath S Melavanki
Agronomy Section, ICAR-National Dairy Research Institute, Karnal, 132001, India.
*Author to whom correspondence should be addressed.
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.
Keywords: Dry matter accumulation, economic analysis, nutrient management, foliar nutrient application, yield