Effect of Different RDF Regimes and Nano DAP on Growth, Yield and Nutrient Dynamics of Chickpea (Cicer arietinum)

Abstract

This study investigated the effect of combining full and reduced recommended dose of fertilizer (RDF) levels with Nano Diammonium Phosphate (DAP) on growth, yield, and nutrient dynamics in chickpea (Cicer arietinum). Two-year field experiments was conducted using a randomized block design with 10 treatments and 3 replications. Treatments included the control, 100% RDF, 75% and 50% RDF, and combinations of these with Nano DAP seed treatments and foliar sprays. Key parameters measured included plant growth, yield components, seed and straw yields, nutrient content and uptake, The 100% RDF treatment produced the highest seed yield (15.98 q ha-1), followed by 75% RDF + Nano DAP (13.73 q ha-1). Nano DAP treatments increased yield compared to equivalent RDF levels alone. The 100% RDF treatment also resulted in maximum nutrient content and uptake in seed and straw. While Nano DAP improved nutrient use efficiency compared to conventional fertilizers, it did not match the performance of 100% RDF when combined with reduced fertilizer levels. The study demonstrated Nano DAP can partially substitute for conventional fertilizers in chickpea, but cannot fully replace RDF for achieving maximum productivity and nutrient uptake.