Phosphorus nutrition of Brassica cultivars under deficient and adequate levels in solution culture

摘要

Brassica is one the of major oil seed crops of many countries for edible oil production. Phosphorus (P) is an important mineral nutrient having a prominent effect on oil contents and seed yield of many oil seed crops. P- deficiency is a common phenomenon in Brassica growing areas of Pakistan while farmers are reluctant to apply it due to its cost-intensive nature and fear of lack of response. A solution culture experiment was conducted to evaluate ten commonly grown Brassica cultivars for their relative efficiency to utilize deficiently and adequately supplied P, using Johnson's modified solution. Control of whole plant dry matter by plant P contents under P deficient conditions suggests an internal regulation in addition to the influence exerted by external P supply. Cultivars, which were efficient in both P-acquisition and P-utilization, were efficient accumulators of biomass under both adequate and deficient supply level of P.