Sri Venkateswara Agricultural College, A.P., Agricultural University, Tirapati, 517502
Efficiency of P utilization was studied in 20 groundnut genotypes under conditions of very low (3.1 mg kg−1), low (6.2 mg kg−1) and optimum (62.0 mg kg−1) P supply. Significant genotypic differences were found in P use efficiency. Shoot weight was found to be sensitive growth parameter to P deficiency. ICGS-11 recorded higher PER of 1130 among the genotypes tested. Based on the phosphorus efficiency ratio (PER), the genotypes were classified into efficient, moderately efficient and inefficient in phosphorus utilization.
