摘要：A two years field trial was conducted to determine the effect of various irrigation schedules and nitrogen rates on the yield and its components of wheat crop.Irrigation treatments comprised of five levels i.e.120,230,360,470 and 600 mm of water as I1,I2,I3,I4 and I5,respectively.Similarly,the amount of nitrogen applied as treatment varied as 0, 40,80,120 and 140 kg N ha-1 i.e.N0,N1,N2,N3 and N4,respectively.The findings revealed that irrigation schedule significantly affected various agronomic traits of wheat as maximum number of tillers m-2,grains spike-1,thousand grain weight and grain yield were observed for the I4 plot where 470 mm of irrigational water was applied,while the lowest values of all these parameters were found for I1 treatment where the least (only 120 mm) water was applied across both years.The results further revealed that in terms of N applied almost similar results were obtained for most of the studied traits as N3 treated plots (where 120 kg N ha-1 was applied exhibited maximum number of tillers,thousand grain weight, grains spike and grain yield followed by N4,while the minimum values of these parameters were observed in those plots where no nitrogen was applied, irrespective of the year.It can be concluded that efficient utilization of vital inputs like water and nitrogen is needed for agricultural and environmental sustainability and to ensure high grain yield of wheat crop.An ideal combination of irrigational water and N-rate comprises of applying 470 mm of water coupled with 120 kg of N ha-1.This combination is not only economical for the farmers but also offers potential to minimize the chances of pollution due to over application of nitrogen thus guarantying sustainability of the agricultural ecosystems.
