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Major rice growing tracts in state coming under 4 agro-ecological units (AEU's) were selected namely, Onattukara sandy soil (AEU 3), Kuttanad (AEU 4), midland wetland laterite(AEU 10), and black soil from ChittorTaluk of Palakkad(AEU 23). An incubation experiment was conducted in the laboratory using these 4 soil types namely, Onattukara sandy soils(S1), Kari soils from Kuttanad (S2), midland wetland lateritic soil(Pattambi (S3) and Black soil from ChittorTaluk of Palakkad(S4) to study the pattern of decomposition of added organic matter and to identify the corresponding variations and stabilization of C:N ratio at equilibrium. For this, the above four soils were incubated under submerged condition with (5 t ha -1 ) and without (0 t ha -1 ) incorporation of paddy straw as the source of organic matter. Our results demonstrate that the C:N ratio based on total carbon and total nitrogen in Kuttanad soils was not stabilized at 10:1.

Variations in pattern of decomposition of added organic matter and C: N ratio in different rice soils of Kerala