Journal of the Indian Society of Soil Science
Year : 2000, Volume : 48, Issue : 1
First page : ( 113) Last page : ( 118)
Print ISSN : 0019-638X.

Criteria for Assessment of the Residual Value of Fertilizer Phosphorus

Sahrawat K.L.¹

International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru P.O., Andhra Pradesh, 502324.

Present address:¹ West Africa Rice Development Association (WARDA), 01 BP 2551, Bouake, Ivory Coast, West Africa.

Received:  July,  1998; Accepted:  December,  1999.

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.

Top

Key words

Dry mailer yield, P response, P uptake, rainfed cropping, Sorghum bicolor, Vertisol.

Top