EFFECT OF IRRIGATION AND NITROGEN LEVELS ON THE YIELD AND YIELD COMPONENTS OF WHEAT

An experiment was conducted at Agriculture Research Station, Serai Nourang, Bannu, NWFP – Pakistan during 2003-04 to study the effect of irrigation levels under various nitrogen levels. During experiment five irrigation levels (120 mm, 230 mm, 360 mm, 470 mm and 600 mm) and five nitrogen doses (control, 40 kg ha-1, 80 kg ha-1, 120 kg ha-1 and 140 kg ha-1) were evaluated. The experiment was planted on 15th Nov. 2003. Data recorded from the irrigation treatments revealed that maximum (688.45) tillers m-2, leaf area index (1.66), grains spike-1 (70.57), 1000-grain weight (47.98 g), grain yield (2677.00 kg ha-1), biological yield (13978.00 kg ha-1), net income (Rs. 39300.00), BCR (3.27 %) and MRR % (327.35) was noted from the plots irrigated with 470 mm water. Statistical analysis of the data also revealed that nitrogen doses significantly affected all parameters except harvest index. It can be inferred from the data showed that maximum (713.50) tillers m-2, leaf area index (1.74), grains spike-1 (67.06), 1000-grain weight (47.47 g), grain yield (2806.75 kg ha-1), biological yield (10817.13 kg ha-1), net income (Rs. 34844.00), BCR (2.96 %) and MRR % (296.11) was noted from the plots fertilized with 120 kg N ha-1. In case of interaction between irrigation and nitrogen it was observed that maximum (843.00) tillers m-2, leaf area index (1.61), grains spike-1 (74.90), 1000-grain weight (49.72 g), grain yield (3150.00 kg ha-1), biological yield (16260.00 kg ha-1), net income (Rs. 48087.00), BCR (3.65 %) and MRR % (364.685) was noted from the plots irrigated with 470 mm water and fertilized with 120 kg N ha-1