Two field experiments to evaluate the effect of different levels of integrated plant nutrition and irrigation scheduling on the growth, radiation use efficiency and yield of cotton during 2003 and 2004 growing seasons. The experiments were conducted on the Agronomic Research Area, Postgraduate Agricultural Research Station (PARS), University of Agriculture, Faisalabad, (31.25^o N, 73.09^o E, 184.0 m) Pakistan. Irrigation schedules I₁ (six irrigations), I₃ (irrigation at 25 mm potential soil moisture deficit) and I₄ (irrigation at 50 mm potential soil moisture deficit) increased seed cotton yield by 79.23%, 80.26% and 81.70%, respectively over I₂ (three irrigations) during 2003 and 79.19%, 80.20% and 81.65%, respectively during 2004.It was mainly due to the increase in total dry matter production (TDM) in former than the later. Increasing rate of integrated plant nutrition levels significantly enhanced seed cotton yield and TDM over control and lower rates of integrated plant nutrition. Integrated plant nutrition level N5 (150-75-75 kg NPK ha^-1 + FYM @ 20 t ha^-1) increased seed cotton yield by 53.63% in 2003 and 53.69 % in 2004 over control that was followed by N₆  (150-75-75 kg NPK ha^-1 + Wheat straw @ 5 t ha^-1) which gave higher seed cotton yield (35.49% in 2003 and 35.50% in 2004 over control) in comparison to the rest of integrated plant nutrition levels. The seed cotton yield was strongly dependent and related to the total dry matter production, as there was a positive and linear relationship between them. Higher TDM production in I₄ (irrigation at 50 mm potential soil moisture deficit) or in other higher integrated plant nutrition levels was due to higher crop growth rate in these treatments. Analyzing crop growth and yield in terms of leaf area duration (LAD) and yields, a strong and positive linear relationship was found. Maximum radiation use efficiency of 1.86, 1.86 and 1.88 gMJ^-1, respectively in 2003 and 1.82, 1.82 and 1.84 in 2004. The minimum values of 1.21gMJ^-1 and 1.19 gMJ^-1 were recorded in 2003 and 2004, respectively with I₂ (three irrigations).Maximum values of radiation use efficiency (1.99 in 2003 and 1.95 in 2004) were recorded with the treatment N₅ (150-75-75 kg NPKha^-1 + FYM @ 20t ha^-1). The minimum values (1.52 in 2003 and 1.49 in 2004) were observed with N₀ (control).

Key Words: Cotton, Irrigation Scheduling, Integrated Plant Nutrition, Growth, Yield, Radiation use Efficiency, Pakistan.