Use of Coal Derived Humic Acid as Soil Conditioner to Improve Soil Physical Properties and Wheat Yield

In Pothwar area of Punjab Pakistan (33 o N to 74 o E), intensive soil tillage, soil erosion and low crop residue input are the reasons which have lead to the deterioration of soil structure. Structurally unstable soils are more susceptible to erosion which, in turn, leads to poor crop productivity. Therefore, a field study was conducted in dry land region of Punjab, Pakistan to improve soil physical health at campus of University R esearch Farm (PMAS Arid Agriculture University, Rawalpindi). Two different grades (Laboratory and commercial grade) of humic acid along with eight levels were applied for two years. The treatments were HL 0 (control), HL 1 10 kg H.A ha - 1 , HL 2