Effect of various levels of NPK on crop growth and yield of sunflower hybrids grown under autumn seasons

The present study investigates the effect of various doses of n,p and k (0,50,100 and 150 kg ha-1) on sunflower hybrids (sf-187 and parsun-1. the data indicated that different parameters (plant height,head diameter,number of seeds head-1,100 seed weight and biological yield) were significantly (p≤0.05) affected by an increase in fertilizer level in all combinations when compared with the control. maximum seed yield (2813 kg ha-1) was produced by fertilizer combinations of 150:100:100 npk kg ha-1 and minimum in control plot (1813 kg ha-1). hybrid parsun-1 produced less yield than sf-187. oil content also varied with different combinations of npk fertilizers,which ranged from 37 to 39%.during both the seasons. maximum biological yield (15.8 tons ha-1) was produced in npk combination of 150:100:100 kg ha-1. © 2015,pakistan botanical society. all rights reserved.