Soil fertility evaluation of lower Vellar basin in Tamil Nadu

Both surface and subsurface soil samples representing Entisol, Alfisol and Inceptisol consisting 13 soil series were studied for the preparation of the soil fertility classification in the Lower Vellar basin area of Pudukottai district. 'd' (dry condition), 'b' (basic reaction), 'm' (magnesium deficiency); 'k' (potassium deficiency) and 'i' (Fe-P fixation) were the important soil condition modifiers for the study area. The study area reveals that 13 soil series under the scheme of fertility capability classification made possible to arrive 11 FCC units, comprising of 11 type / substrata type and 5 condition modifiers which serve as the basis for conducting fertility related experiments.