Effect of Continuous Application of Manure and Nitrogenous Fertilizer on Some Properties of Acid Inceptisol

A field experiment was conducted with Nandi setaria grass at four levels of manure and three levels of nitrogen on an Inceptisol of Sikkim. After three years of application of manure and nitrogen, manure increased the pH, organic carbon, available P, CEC, exchangeable Ca²⁺, Mg²⁺ and K⁺ of the soil and decreased the amount of exchangeable Al³⁺ exponentially. Nitrogen application tended to decrease pH, available P, exchangeable Ca²⁺, Mg²⁺ and K⁺ of the soils and increase exchangeable Al³⁺. The lowering of pH and CEC were counteracted by manure.