Canopy mediated growth and productivity in rice bean (Vigna umbellata L.) as influenced by foliar spray of Nano DAP

A field experiment was conducted at College of Agriculture, Kalaburagi during kharif season 2024 with an objective to study canopy mediated growth and productivity in rice bean (Vigna umbellata L.) as influenced by foliar spray of nano DAP. The soil was clayey in texture and experiment was laid out in randomized block design with three replications and comprised of 11 treatments. The treatments comprise of foliar application of nano DAP with varied levels of fertilizers. Foliar spray of nano DAP and conventional DAP was done on 30 DAS. The results revealed that, basal application of 100 per cent RDF + foliar spray of 4 ml l^-1 of nano DAP had resulted in higher seed yield (1160 kg ha^-1), however, it was statistically on par with the application of 100 per cent RDF + 2ml l^-1 nano DAP spray (1125 kg ha^-1), 100 per cent RDF + 2% DAP spray (1065 kg ha^-1) and 75% per cent RDF + 4 ml l^-1 nano DAP spray (1027 kg ha^-1). Similar trend has been followed in case of growth and yield parameters. These results confirms that 25 per cent of conventional DAP fertilizer can be replaced with nano DAP application of 4 ml l^-1 at 30 DAS in increasing the N and P use efficiency and productivity of rice bean.