Studies on effect of NANO DAP on yield and nutrient uptake of soybean grown on Vertisol

The present field experiment was conducted during Kharif season of 2023-24 at Research Farm, Department of Soil Science and Agricultural Chemistry, Vasantrao Naik Marathwada Krishi Vidyapeeth, Parbhani. The experiment was laid out in RBD (Randomized Block Design) with 3 replications and 10 treatments viz. T1 – (Absolute Control), T2 - [RDF (N 30:P 60: K 60: S 20:Zn 25) kg ha-1], T3 –[50% RDF + 1 Foliar Spray of Nano-DAP (30 DAS)], T4 –[50% RDF + 2 Foliar Spray of Nano-DAP (30 & 60 DAS)], T5 – [75% RDF + 1 Foliar Spray of Nano-DAP (30 DAS)], T6 – [75% RDF + 2 Foliar Spray of Nano-DAP (30& 60 DAS)], T7 – [100% RDF + 1 Foliar Spray of Nano-DAP (30 DAS)], T8 – [100% RDF + 1 foliar spray Grade II (30DAS)], T9 – [100% RDF + 1 foliar sprays of 19:19:19 (30DAS)] and T10– [100% RDF + 1 foliar sprays of 00:52:34 (30DAS)].By the application of treatment T7–100% RDF + 1 Foliar Spray of NANO-DAP (30 DAS), there was significantly higher grain and straw yield in soybean. The treatment T7 with 100% RDF + 1 Foliar Spray of NANO-DAP (30 DAS) showed significantly higher values for available N, P2O5, K2O and sulphur at the harvest stage of soybean. The treatment T7 with 100% RDF + 1 Foliar Spray of NANO-DAP (30 DAS) showed positive response over other treatments significantly increased in content and uptake of nitrogen, phosphorus, potassium and sulphur. Results concluded that, one spray of NANO DAP @ 30DAS along with recommended dose of fertilizer seems to be beneficial for enhancing the soil fertility and soybean yield.