Response of different peanut genotypes to reduced phosphorous availability

Abstract

Performances of 23 peanut genotypes comprising of
popular varieties and few widely used germplasm
accessions were compared under P-unfertilized and Pfertilized conditions during kharif and summer seasons to
identify P-efficient and P-inefficient genotypes. Yield
parameters and P concentrations in different plant parts at
maturity were recorded and P-efficiency indices calculated.
Significant differences among peanut genotypes, P levels
and P × genotype interactions were observed for all the
traits. LP caused 33% and 23% yield reduction during kharif
and summer season respectively. However, performance
of genotypes varied with the season and P supply.
Genotypes FeESG-10, GG-7, GG-20 and TG-37A with high
yield, kernel P-uptake and P concentration in leaf were Pefficient. On the contrary genotypes NRCG-162, GPBD-4,
NRCG-7320 and NRCG-7085 were identified as P-inefficient.
As an immediate solution to P deficient soils, the P-efficient
genotypes could be directly grown in the LP soils with/
without using P to get high yield.