http://oar.icrisat.org/id/eprint/1854 2011-09-22T08:15:24Z info:eu-repo/semantics/descriptiveMetadata http://oar.icrisat.org/1854/ Residual phosphorus and management strategy for grain sorghum on a vertisol Sahrawat, K L Sorghum Fertilizer phosphorus (P) use on Vertisols of the semi-arid zone in India is becoming more common, so it is important that for developing P management strategies the residual value of P is allowed. Little information is available on this aspect for crops such as sorghum under rainfed cropping. A field experiment was conducted for three years to study the response of sorghum to fertilizer P (0, 10, 20, and 40 kg P ha-1) in the absence and presence of P residues from the preceding year on a Vertisol (Typic Pellustert), low in extractable P (0.4 mg kg-1 soil Olsen-P). Despite the variable rainfall received during the cropping season (June-September), P applied in the previous season had strong residual effects. Sorghum yield and P uptake in treatments in which P was applied at 20 or 40 kg P ha-1 once in two years was at par with or higher than in treatments in which 10 kg or 20 kg P ha-1 was added every year. Ninety percent relative grain yield was achieved at about 20 kg ha-1 of fresh P and the results presented show that application of 40 kg P ha-1 once in two years can satisfactorily meet the P requirement of sorghum on the Vertisol. Taylor & Francis 2000 Article PeerReviewed application/pdf en http://oar.icrisat.org/1854/1/ComSoiSciPlAna31_19-20_3103-3112_2000.pdf Sahrawat, K L (2000) Residual phosphorus and management strategy for grain sorghum on a vertisol. Communications in Soil Science and Plant Analysis, 31 (19/20). pp. 3103-3112. ISSN 0010-3624 http://dx.doi.org/10.1080/00103620009370653 info:eu-repo/semantics/objectFile info:eu-repo/semantics/humanStartPage