TY  - JOUR
AV  - restricted
A1  - Sahrawat, K L
TI  - Criteria for Assessment of the Residual Value of Fertilizer Phosphorus
UR  - http://www.indianjournals.com/ijor.aspx?target=ijor:jisss&volume=48&issue=1&article=022
JF  - Journal of the Indian Sociely of Soii Science
SN  - 0974-0228
PB  - Indian Sociely of Soii Science
N2  - 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
KW  - Dry mailer yield
KW  -  P response
KW  -  P uptake
KW  -  rainfed cropping
KW  -  Sorghum bicolor
KW  -  Vertisol.


Y1  - 2000///
SP  - 113
ID  - icrisat4529
EP  - 118
VL  - 48
IS  - 1
ER  -