Written Paper

Differential growth response and phosphorus utilization efficiency of rice genotypes  [2002]

Gill, M.A. Mansoor, S. Aziz, T. Rahmatullah et al.

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Rice is an important food crop, which commonly suffers from P deficiency on calcareous soils. Additionally recovery of applied P fertilizers is notoriously low. Different crop species and varieties differ genetically in responding to root medium P. Twenty four important rice genotypes evaluated for their response to 16 muM P and 160 muM P rates of P application in a hydroponics study differed significantly (p less than 0.001) in their shoot growth, root development and root: shoot ratio. Concentration and total uptake of P in shoot and root, specific absorption rate of P, P transport- rate and P utilization efficiency was also significantly (p less than 0.001) different for the various rice genotypes. Shoot dry matter yield, root dry matter yield and total bio-mass production correlated significantly (p less than 0.001) with their total P uptake and P utilization.

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Pakistan Journal of Agricultural Sciences (Pakistan)

ISSN : 0552-9034