EFFECT OF NAPHTHALENE ACETIC ACID AND PHOSPHORUS LEVELS ON THE YIELD POTENTIAL OF TRANSPLANTED COARSE RICE

The effect of various levels of NAA and phosphorus on the yield and yield components of transplanted coarse rice, was studied. The study was conducted at Research Area at Rukh Bibi Campus Gomal University, Dara Ismail Khan, NWFP, Pakistan during 2004 and 2005. The experimental design was RCB with split plot arrangement. Main plot consisted of four levels of NAA viz. 0, 60, 90 and 120 ml ha^-1, while sub-plots consisted of five levels of 0, 50, 100, 150 and 200 kg ha^-1 phosphorus in the form of single supper phosphate (SSP). It was noted that plant height, productive tillers, 1000-grain weight, paddy yield, and harvest index were maximum at 90 ml followed by 60 and 120 ml ha^-1 and minimum in control during both years. Where as in phosphorus levels maximum plant height, productive tillers, 1000-grain weight, paddy yield and harvest index were recorded at 100 kg P2O5 ha^-1 followed by 150,200 and 50 kg P2O5 ha^-1. The treatments interactive effects of plant growth regulator and phosphorus levels were maximum in 90 ml NAA x 100kg P2O5 ha-1 and minimum in control plots during both years.