Abstract:Low soil acidity is one of the most important constraints for crop growth in high rainfall area. Some plant residues could efficiently increase soil pH and reduce Al activity of soil solution, leading to better crop production. The potential of plant residues to ameliorate soil acidity varies greatly, depending on both the nature of plant residue and the type of soil. Highest pH increase reported was 4.53 pH units. Several legume materials could increase soil pH by more than 2 units. When soil pH increases ...