TY  - JOUR
N2  - Two methods were evaluated for determining the fertilizer phosphorus requirements (FPR) of sorghum grown on a Vertisol under rainfed conditions. The first method was based on P on applied P uptake, and grain yield relationships for grain sorghum. In this method, P uptake at a given yield was determined from the relationship between total P uptake and grain yield. The amount of fertilizer P applied for the given P uptake and grain yield was then, determined from the relationship between P applied and P uptake. In the second method, FPR was determined using the equation: FPR=(Up-U0)/PRF, where Up is P uptake at a given yield, U0 is P uptake from unfertilized soil, and PRF is the recovery of applied P. The parameters, U0, Up, and PRF were determined in a field experiment in India. There was a good agreement between the observed value of FPR and predicted values determined by the two methods. These results suggest that the simple models based on P uptake can be utilized for determining the fertilizer requirements of crops.
AV  - restricted
A1  - Sahrawat, K L
TI  - Assessing the Fertilizer Phosphorus Requirement of Grain Sorghum
UR  - http://dx.doi.org/10.1080/00103629909370311
JF  - Communications in Soil Science and Plant Analysis
SP  - 1593
Y1  - 1999///
ID  - icrisat1804
EP  - 1601
VL  - 30
IS  - 11/12
ER  -