COMPARISION OF RESPONSE OF GROUNDNUT GENOTYPES AT DIFFERENT PHOSPHORUS LEVELS
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Authors
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AJAY B.C*, SINGH A.L., BERA S.K., NARENDRA KUMAR, DAGLA M.C and K.C. NATARAJ
Directorate of Groundnut Research, Junagadh, Gujarat – 362 001
Abstract
Low phosphorus (P) availability in soil is one of the limiting factors affecting groundnut productivity by
reducing leaf area and dry weight. This study evaluated groundnut genotypes for their ability to thrive and produce
on calcareous soils with low phosphorus availability. Assessment of shoot biomass, root biomass, shoot Pconcentration,
kernel P-concentration, P-accumulation and yield were completed using three phosphorus levels
and 23 groundnut genotypes. Study was conducted with three phosphorus levels namely no (P0), normal P (P50) and
high P (P100) as the main factor with genotypes as second factor arranged in a factorial completely randomized
design. Significant genotypic differences were observed for the characters studied. Shoot P-concentration and
accumulation increased with increase in phosphorus levels, whereas, root biomass and kernel P-concentration
decreased with increase in phosphorus levels. There was varying response of genotypes for yield, kernel Pconcentration
and accumulation, shoot P-concentration and accumulation, biomass and harvest index. In addition,
genotypes ICG-221, GG-5, TG-37A and FeESG-10 were designated as ‘high yielder–non-responsive’, whereas,
genotypes NRCG-15049, TPG-41, GPBD-4 and NRCG-3498 were identified as ‘low yielder - responsive’. These
genotypes can be used in breeding programs to develop ‘high-yielder– responsive’ genotypes.
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