Indian Society of Genetics & Plant Breeding

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Screening of groundnut genotypes for phosphorus efficiency under field conditions

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Groundnut is an important legume of tropical world where
phosphorus (P) deficiency is one of the limiting factors
affecting productivity and use of P-efficient genotype is
the solution. Thus P-efficiency among seventy groundnut
genotypes was studied under P-deficit (-P) and adequate-
P (+P) condition by recording yield and its attributes and
calculating various P-efficiency indices. Significant
differences among groundnut genotypes, P levels and their
interactions were observed for all the traits and the range
of pod yield was 3.4-10.5 g plant-1 under -P and 4.1-12.8 g
plant-1 at +P, 100 seed mass was 23-68 g. The range of
phosphorus stress factor (PSF) was -40 to 39 in pod (PSFp)
and -142 to 45 in haulm (PSFh), P efficiency (PE) was 0.61-
1.40 in pod (PEp) and 0.55-2.42 in haulm (PEh) and agronomic
P use efficiency was 14 to 29. Genotypes were divided into
efficient, inefficient and moderate based on the P-efficiency
index (PEI), but into efficient and inefficient, responder
and non-responder, using PEI and pod yielding potential.
The efficient responders genotypes GG 5, PBS 11037, PBS
11046, PBS 13007, PBS 20505 and SP 250A with low PSF,
high PEI and, PE close to unity were identified for P-deficit
soils.

Keywords: Groundnut, Phosphorus efficiency, Screening methodologies, P-efficient genotypes

Info

Year: 2015
Volume: 75
Issue: 3
Article DOI: 10.5958/0975-6906.2015.00057.7
Print ISSN: 0019-5200
Online ISSN: 0975-6906

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