Effect of foliar fertilization of nano urea under different nitrogen levels on nutrient content and uptake by summer pearl millet (Pennisetum glaucum L.)

A field experiment was conducted at the Instructional Farm, College of Agriculture, Junagadh Agricultural University, Junagadh, during the summer season of 2023 and 2024 to study the effect of foliar fertilization of nano urea under different nitrogen levels on nutrient content and uptake by summer pearl millet (Pennisetum glaucum L.). The experiment was laid out in factorial randomized block design (FRBD) consist of two factors and four levels of each. Among the two factor, one was different levels of nitrogen viz., N₁: 0%, N₂: 50%, N₃: 75% and N₄: 100% RDN (Recommended dose of nitrogen) and another was levels of nano urea foliar spray viz., S₁: control (water spray), S₂: 2, S₃: 3 and S₄: 4 ml L^-1 at 35 and 55 DAS and replicated three times. The concentration of macro (N, P and K) in grain and fodder at harvest remained significantly affected due to different nitrogen levels. Nitrogen, phosphorus and potassium content in grain and their uptake by grain recorded higher under application of 90 kg N ha^-1, while 120 kg N ha^-1 remained at par treatment. Whereas in case of N, P and K content in fodder and their uptake reported maximum with treatment N₄ (100% RDN) which was noted at par with 75% RDN (N₃) noted as at par one and 75% RDN with 3 ml nano urea L^-1 at 35 and 55 DAS archived significantly higher nitrogen content and uptake, phosphorus uptake by grain and potassium uptake by grain and fodder. However, nitrogen content and uptake by fodder, phosphorus uptake by fodder recognized higher in 120 kg N ha^-1 with 3 ml L^-1 foliar spray nano urea (N₄S₃).