http://oar.icrisat.org/id/eprint/4529 2011-11-30T06:30:20Z info:eu-repo/semantics/descriptiveMetadata http://oar.icrisat.org/4529/ Criteria for Assessment of the Residual Value of Fertilizer Phosphorus Sahrawat, K L Sorghum Soil Science Fertilizer Applications Sorghum yield and P uptake response data from a field experiment conducted at the ICRISAT farm, Patancheru (near Hyderabad) consecutively for four years (1987–1990) were used for determining the residual value of fertilizer P under rainfed cropping on a Vertisol acutely deficient in P. There were seasonal differences in the residual values of P. But more importantly, the residual P value varied depending on the criteria employed for crop response. On an average, the residual value of fertilizer P in the succeeding season was 52 per cent as effective as the fresh P when dry matter yield response was used as the criterion. The residual value of applied P was found to be 47 per cent as effective using grain yield response as the criterion, and the residual P was only 35 per cent as effective as the fresh P when total P uptake response was used as the criterion. It is suggested that the dry matter yield response of sorghum is a simple and practical criterion for determining the residual value of fertilizer P under rainfed cropping Indian Sociely of Soii Science 2000 Article PeerReviewed application/pdf en http://oar.icrisat.org/4529/1/J_Ind_soc_sc_48_1_113-118_2000.pdf Sahrawat, K L (2000) Criteria for Assessment of the Residual Value of Fertilizer Phosphorus. Journal of the Indian Sociely of Soii Science, 48 (1). pp. 113-118. ISSN 0974-0228 http://www.indianjournals.com/ijor.aspx?target=ijor:jisss&volume=48&issue=1&article=022 info:eu-repo/semantics/objectFile info:eu-repo/semantics/humanStartPage