Influence of Nano DAP-based Phosphorus Application through Seedling Dipping and Foliar Spray on Growth, Yield Attributes and Yield of Transplanted Rice (Oryza sativa L.)

During the 2024 kharif season, a field experiment was carried out at the Agriculture Research Farm of Rama University, Mandhana, Kanpur, Uttar Pradesh, to assess the effects of applying phosphorus based on nano DAP via foliar spray and seedling dipping on transplanted rice yield, growth, and yield attributes. Ten treatment combinations made up the trial, which was carried out using a Randomized Complete Block Design (RCBD). The crop was grown using all advised agronomic techniques, and fertilizer was used in accordance with the treatments. The results revealed that application of 75% recommended P + 100% recommended N and K + seedling dipping with nano DAP @ 5 ml litre-1 + Foliar spray with nano DAP @ 4 ml litre-1 of water at 30 DAT proved most effective in enhancing growth parameters i.e., plant height, number of tillers m-2, leaf area index, and dry matter accumulation at all crop growth stages, yield attributes viz., number of productive tillers (424.15 m-2), grains penicle-1 (104.49), and panicle length (25.76 cm), grain yield (4.22 t ha-1), straw yield (6.08 t ha-1), biological yield (10.30 t ha-1) and harvest index (40.98%), which was statistically similar with the treatment where 75% recommended P + 100% Recommended N and K + seedling dipping with nano DAP @ 2.5 ml litre-1 + Foliar spray with nano DAP @ 4 ml litre-1 of water at 30 DAT, 50% recommended P + 100% Recommended N and K + seedling dipping with nano DAP @ 5 ml litre-1 + 2 Foliar spray with nano DAP @ 4 ml litre-1 of water at 30 DAT and 75 DAT, 50% recommended P + 100% Recommended N and K + seedling dipping with nano DAP @ 2.5 ml litre-1 + 2 Foliar spray with nano DAP @ 4 ml litre-1 of water at 30 DAT and 75 DAT and 100% recommended N: P: K were applied, while significantly superior over rest of the treatments. Thus, it can be determined that 25% DAP substitution with seedling dipping with nano DAP @ 5 ml litre-1 and foliar spray of nano DAP @ 4 ml litre-1 at 30 DAT was found to be the most effective option for achieving higher growth and yield attributes performance, resulting in a higher yield of transplanted rice.