Incubation Study of the Calcium Silicate as an Acid Soil Amendment with and without FYM

The Possibility of using the calcium silicate as a soil amendment in an acid soil was investigated. Calcium silicate contained 80% calcium carbonates with24.17% of silicon. An incubation study was conducted with an acid soil up to 50 days and the treatments included various doses of calcium silicate (0.1, 0.2 & 0.3 LR) with and without FYM. Results indicatedthe application of different doses of calcium silicateraised the pH from 5.1 to 5.7 and maintained from 21^st to 28^th days of incubation period. But when these different doses of calcium silicate mixed with FYM, it raised the pH from 5.3 to 5.9 and maintained upto 28^th days of incubation period. The application of different doses of calcium silicate neutralised the acidity (from 1.14 to 0.70 Cmol(P⁺)/kg), exchangeable Al⁺³ (from 0.62 to 0.50 Cmol(P⁺)/kg) and exchangeable H⁺ (from 0.52 to 0.20 Cmol(P⁺)/kg). But the combine application of different doses of calcium silicate with FYM neutralised the acidity (from 1.12 to 0.67 Cmol(P⁺)/kg), exchangeable Al⁺³ (from 0.56 to 0.47 Cmol(P⁺)/kg) and exchangeable H⁺(0.53 to 0.20 Cmol(P⁺)/kg) more. Theapplication of calcium silicate@0.3 LR mixed with FYM raised the pH (5.9) and neutralised the acidity (0.67 Cmol(P⁺)/kg), exchangeable Al⁺³ (0.47 Cmol(P⁺)/kg) and exchangeable H⁺ (0.20 Cmol(P⁺)/kg) more compare to the other treatments.