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Sahrawat, K L and Bhattacharyya, T and Wani, S P and Chandran, P and Ray, S K and Pal, D K and Padmaja, K V (2005) Long-term lowland rice and arable cropping effects on carbon and nitrogen status of some semi-arid tropical soils. Current Science, 89 (12). pp. 2159-2163.