Criteria for Assessment of the Residual Value of Fertilizer Phosphorus

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

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Abstract

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

Item Type: Article
Divisions: UNSPECIFIED
CRP: UNSPECIFIED
Uncontrolled Keywords: Dry mailer yield, P response, P uptake, rainfed cropping, Sorghum bicolor, Vertisol.
Subjects: Mandate crops > Sorghum
Others > Soil Science
Others > Fertilizer Applications
Depositing User: Mr Sanat Kumar Behera
Date Deposited: 30 Nov 2011 06:30
Last Modified: 30 Nov 2011 06:30
URI: http://oar.icrisat.org/id/eprint/4529
Official URL: http://www.indianjournals.com/ijor.aspx?target=ijo...
Projects: UNSPECIFIED
Funders: UNSPECIFIED
Acknowledgement: UNSPECIFIED
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