Asian Research Journal of Agriculture

Humic acids is an important soil component that can improve nutrient availability and impact on other important chemical, biological, and physical properties of soils. The ecological benefits of Humic acids are diverse and represent profitable and effective solutions for environmental problems and preservation of the environment. It can be integrated into the soils in the form of manure; it improves the physico chemical and biological properties of the soil. A field experiment was conducted at the College Farm, Agricultural College, Mahanandi, ANGRAU during kharif & rabi seasons of 2020-21 and 2021-22. The experimental soil was sandy loam in texture with a pH of 7.52, an Electrical Conductivity (EC) of 0.42 dS/m, 0.32% Organic Carbon (OC), low available nitrogen (175 kg ha-1), medium phosphorus (P) at 18.48 kg ha-1, high potassium (K) at 580 kg ha-1, and sufficient zinc (Zn) status at 0.85 ppm. The experiment was laid out in split plot design with three replications with four main plots and six sub plots total twenty four treatments. After critical observation of the study, available iron, Zinc, Copper and Manganese contents in soil revealed that there was significant difference between the subplots that received different levels of Humic acids but main plots that received different levels of inorganic fertilizers and their interaction was found to be non significant at panicle initiation and harvest stages of foxtail millet crop in two kharif seasons of 2020 and 2021. Similar results were recorded in soil Copper and Manganese contents during two kharif seasons of Foxtail millet crop. However, the similar trend was followed in succeeding bengalgram crop.