Asian Journal of Plant Sciences1682-39741812-5697Asian Network for Scientific Information10.3923/ajps.2003.814.816IqbalRana Muhammad Hafiz Qutub Iqbal Chauhan 112003211The investigation to see the effect of different phosphorus levels viz., 0,50,75,100 and 125 kg P2O5 ha-1 with a recommended constant dose of nitrogen @ 150 kg ha-1 on the leaf growth of two maize varieties was carried out. The experiment was laid out in Randomized Complete Block Design (factorial) with four replications. The maize cultivars included were Composite-17 against a standard variety Akbar. Leaf extension rate (LER) was calculated as the slope of a linear regression fitted to the points along the A-B position of the graph. Final leaf length (FLL) was measured as lamina plus sheath when the individual leaf was fully expanded. Using data for final leaf length and the calculated LER, the duration of leaf extension rate (LED) was calculated. Phosphorus levels increased FLL in both the maize varieties due to increase in LER. In the present study LED was negatively correlated with FLL and LER, indicating that phosphorus applications decreased the duration for leaf expansion due to increases in LER.]]>Barreto, A.C. and M.F. Fernandes,200226151156Berardo, A., S. Ehrt, F.D. Grattone and F.O. Garcia,2001Vol. 15,Bos, H.J., H. Tijani-Eniola and P.C. Struik,200048181198Ernani, P.R., C. Steckling and C. Bayer,200124939946Iqbal, R.M.,19921992 Kemal-ur-Rahim, K.,19881988Maan, A.A.S., D. Wright and M.B. Alcock,1989113305315Plenet, D., S. Etehebest, A. Mollier and S. Pellerin,2000223117130Plenets, D., A. Mollier and S.I. Pellerin,2000224259272Sorensen, I. and P. Stone,1999298385Steel, R.G.D. and J.H. Torrie,19841st Edn.,pp: 172-176pp: 172-176