Twenty soils, belonging to the soil series Karattupatti, Kandamanur, Muthalampatti, Andipatti and Vaigai Dam were grouped in 6 FCC (Fertility Capability Classification) units based on type, substrata type and condition modifiers. The FCC units will serve as the basis for conducting fertility related experiments and extrapolation of such experimental results. The condition modifiers that decide the soil and fertilizer interactions in the study are ‘d’ (dry condition), ‘m’ (magnesium deficiency), ‘e’ (low CEC), 'b' (free CaCO3), V (vertic characters) and 'i' (Fe-P fixation). All the soil series except Kandamanur series are low in available nitrogen and hence in addition to the above modifiers, the low available N status was also considered to be the local modifier.
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