Abstract
Brassica is an important oil seed crop of Pakistan, which commonly suffers from P deficiency. A solution culture experiment was conducted to evaluate the differential growth response and P utilization efficiency of ten Brassica genotypes supplied with deficient (20 u M) and adequate (200 ~IM) P, in Johnsons modified solution. The genotypes differed significantly (p < 0.0 I) in their shoot growth, root development and root: shoot ratio at both P levels. Phosphorus concentration and uptake in shoot and P utilization efficiency was also significantly different among various Brassica genotypes. Shoot and root dry matter yield as well as total biornass production correlated significantly (p < 0.0 I) with their shoot P uptake and P utilization efficiency. Genotypes, which were efficient in P utilization, were efficient accumulators ofbiomass under adequate as well as deficient level of P supply
