Vol. 12, Issue 12 (2023)

Author(s):
Prakash, Anand Naik, Siddaram, Ravi MV and Bellakki MA

Abstract:
A field experiment on effect of nano DAP on nutrient uptake and available nutrients status after harvest of soybean (Glycine max L.) was conducted during Kharif 2022 at ICAR-KVK, Kalaburagi. The soil of the experimental site was black, shallow to medium in depth with moderately alkaline pH, low in EC, SOC and nitrogen, medium in phosphorus, high in potassium and medium in sulphur. The experiment was laid out in RCBD with eight treatments replicated thrice. The results revealed that, soil pH, electrical conductivity, SOC and CaCO₃ were not significantly influenced by foliar application of nano DAP. Application of 100% RDF + foliar spray of nano DAP @ 4 ml L^-1 at 30 and 45 DAS recorded significantly higher available nutrients in soil (215, 33.77, 351 and 17.28 kg ha^-1 N, P₂O₅, K₂O and SO₄^-2, respectively) and uptake of nitrogen (180 kg ha^-1), phosphorus (44.21 kg ha^-1), potassium (75.38 kg ha^-1), Sulphur (24.91 kg ha^-1) and micronutrients. However it was on par with 100% RDF + foliar spray of 2 ml L^-1 nano DAP at 30 and 45 DAS. Hence, for effective management of crop nutrition, the application of 100% RDF and foliar spray of 2 ml L^-1 nano DAP at 30 and 45 DAS was recommended.