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Warren, G P and Sahrawat, K L (1993) Assessment of fertilizer P residues in a calcareous vertisol. Fertilizer Research, 34 (1). pp. 45-53. ISSN 0167-1731
Sahrawat, K L and Warren, G P (1989) Sorption of labelled phosphate by a vertisol and an alfisol of the semi-arid zone of India. Fertilizer Research, 20 (1). pp. 17-25. ISSN 0167-1731