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RESPONSE OF CANDIDATE WHEAT VARIETY ‘NIA-8/7’ TO DIFFERENT LEVELS/RATIOS OF NITROGEN AND PHOSPHORUS
Abstract
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 P2O5 (0, 30, 40, 45, 60, 75, 90, 110 and 135 kg ha-1) along with 60 kg K2O ha-1 in 10 combinations were employed in 4:1, 4:2 and 4:3 N:P2O5 ratios. The results showed that the grain yield increased significantly (P <0.05) with fertilizer levels up to 150 kg N, and 110 kg P2O5 ha-1. The differences in grain yield at 150:110 and 180:135 levels of N: P2O5 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 P2O5 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 P2O5 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 agro-climatic conditions of Sindh.
