humic acid application：
soil is used as a basic medium for growing crops. Most of the soils in Pakistan contain less than 1% organic matter, thus have poor soil texture and structure. As a result, the activities of soil microorganisms as well as plant growth and yield are reduced. The chemical fertilizers used to compensate the fertility status of soil are very expensive for the farmers. Most of the trace elements become unavailable to the plants due to soil alkalinity caused by lack of organic matter. Therefore, it necessitates for rationale use of both traditional and non-traditional organic sources (Marinari et al., 2000). Humic substances can be used as alternate sources of organic matter to improve soil physico-chemical properties as well as crop growth and final yield (Ohta et al., 2004).