Influence of Humic Acid on Yield and Physiological Attributes of Greengram (Vigna radiata L.)

A field experiment was conducted to study the influence of humic acid on physiological attributes of greengram (Vigna radiata L.) in loamy sand at Agronomy Instructional Farm, Chimanbhai Patel College of Agriculture, Sardarkrushinagar Dantiwada Agricultural University, Gujarat during kharif of 2023. Nine treatment combinations comprising three levels each of soil application of humic acid (0, 3 and 6 kg/ha) and foliar application of humic acid (0, 250 and 500 ppm) were evaluated in randomized block design with factorial concept and replicated four times. Soil application of 6 kg humic acid ha-1 at the time of sowing and foliar application of 250 ppm humic acid at 30 and 45 days after sowing (DAS) besides recommended dose of fertilizer viz., 20:40:00 N: P2O5: K2O kg ha-1 led to notably higher protein content in seeds, increased protein yield, and enhanced nitrogen and phosphorus content, and uptake in both seeds and stover. This treatment also improved grain and straw yields. The lowest protein content, protein yield, nutrient content and uptake in seed and stover at harvest, as well as grain and straw yields, were observed in plots that did not receive soil or foliar application of humic acid.