Response of candidate wheat variety 'NIA-8/7' to different levels/ratios of nitrogen and phosphorus

Field experiments were conducted for two consecutive years (2007-08 and 2008-09) to evaluate the response of a candidate wheat variety nia-8/7 to different ratios of nitrogen and phosphorus. four levels of n (0,120,150 and 180 kg ha- 1) and nine levels of p 2o 5 (0,30,40,45,60,75,90,110 and 135 kg ha -1) along with 60 kg k 2o ha -1 in 10 combinations were employed in 4:1,4:2 and 4:3 n:p 2o 5 ratios. the results showed that the grain yield increased significantly (p <0.05) with fertilizer levels up to 150 kg n,and 110 kg p 2o 5 ha -1. the differences in grain yield at 150:110 and 180:135 levels of n: p 2o 5 were not significantly different with each other during both years. yield traits viz.,spike length,number of grains per spike and 100-grain weight were higher at 150:110 kg n and p 2o 5 ha -1 as compared with other treatments. the test genotype nia-8/7,produced significantly highest yield (5417 kg ha -1) at 150 kg n and 110 kg p 2o 5 ha -1,therefore,it is observed that it could be adopted as the most economical dose for obtaining the maximum yield from this wheat genotype under the agroclimatic conditions of sindh.