The present study examined the effect of different levels of humic acid foliar application on growth, biochemical parameters, Yield and yield components of redgram. The study was conducted during kharif 2013-14 at Main Agricultural Research Station, UAS, Raichur by using Randomized block design. The effectiveness of humic acid was studied with different levels as T1 - Humic acid liquid 15% @ 1.0 ml/l of water, T2 - Humic acid liquid 15% @ 1.5 ml/l of water, T3 - Humic acid liquid 15% @ 2.5 ml/l of water, T4 - Humic acid liquid 15% @ 4.0 ml/l of water, T5 - Planofix 4.5 % @ 20ppm and T6 - as a control. Redgram growth and biochemical parameters including plant height, number of primary and secondary branches , leaf area, dry matter production, root development , flower drops, minerals content and yield components were measured at 60,90 DAS and at harvest, respectively. Significant differences (p<0.5) were observed for all the above mentioned parameters across the humic acid levels. Based on this study, the foliar application T4-Humic acid liquid 15% @ 4.0 ml/l of water, may be recommended to improve growth, biochemical and yield components of redgram in similar environmental conditions. Further, research is required in diverse plant environments to determine economically feasible application levels of humic acid while comparing it with other plant growth regulators sources.