Chemical Characteristics of an Acid Sulphate Soil from Kerala Amended with Lime and Flyash

Effect of flyash and lime applications on some chemical characteristics of Sulphaquept (kari) growing rice and its residual effect under lettuce crop was studied. Flyash did not increase pH, EC and exchangeable calcium content of the soil under both the crops. The effect of liming as well as its interaction with flyash was significant with respect to these parameters. The available sulphur content of the soil was increased with flyash but declined with lime application. However, the residual effect of lime alone resulted in increased sulphur content. Flyash application significantly increased the available iron and zinc content of soil while lime reduced both of them. However, flyash amended soils under lettuce did not affect available zinc content while liming decreased it. Flyash application increased the exchangeable aluminium content of the soil under both crops while the effect of lime was not noticeable. The residual flyash and lime tended to reduce available cadmium.