Asian Journal of Soil Science and Plant Nutrition

The present study was executed with the prime objective to study the effect of different micronutrients on morpho-physiological parameters of black gram variety GAU-4 (Shyamal). The field trial was carried out in summer 2023 at Department of Plant Physiology, Anand Agricultural University, Anand in randomized block design with eight treatments replicated thrice. The micronutrients were sprayed at 25 and 35 days after sowing. Morphological parameters like plant height and number of trifoliate leaves per plant were recorded highest with ZnSO₄ 0.5% + FeSO₄ 0.5% + Boric acid 0.2% + sulphur @20 kg/ha concentration of micronutrients. Control recorded the lowest plant height and number of trifoliate leaves per plant. ZnSO₄ 0.5% + FeSO₄ 0.5% + Boric acid 0.2% + sulphur @20 kg/ha promoted early flowering and recorded highest stem and total dry weight. Maximum values for leaf area, leaf area index and leaf area ratio was observed with ZnSO₄ 0.5% + FeSO₄ 0.5% + Boric acid 0.2% + sulphur @20 kg/ha at different growth stages. Net assimilation rate and crop growth rate also observed similar trends recording higher values in ZnSO₄ 0.5% + FeSO₄ 0.5% + Boric acid 0.2% + sulphur @20 kg/ha at various crop growth stages. The application of micronutrients is one of the possible way to increase productivity of black gram.