* Division of Plant Physiology APAU—Regional Agricultural Research Station, Naddyal-518503, A.P.
** APATJ—Administrative Office, Rajendranagar, Hyderabad-500030
Department of Plant Physiology, A.P. Agricultural University, College of Agriculture, Rajendranagar, Hyderabad-503030
Efficiency of P utilization was studied in three groundnut cultivars viz., MK-374, M-13 (the Virginia types) and J-11 (the Spanish type). Ranking of cultivars in terms of efficiency of P utilization varied according to the definition used. Dry matter yield of shoot and root was highest with cv. MK-374 sit a given amount of applied P. Shoot dry matter production at a constant shoot P concentration and P uptake per unit root dry weight were also maximum in cv. MK-374. Spanish cultivar J-11 accumulated greater total dry matter per unit P uptake compared to the Virginia types-cvs. MK-374 and M-13.
