Abstract— A field study was carried out to at Agriculture Research Institute, Sindh Agriculture University Tandojam, to investigate the effect of various nitrogen levels on growth and yield contributing traits of two wheat varieties. Wheat varieties Benazir and TJ-83 were evaluated against four nitrogen levels (0, 90, 120 and 150 kg ha-1).The results revealed that the effect of nitrogen levels as well as varieties differed significantly for all the growth and yield contributing traits and N @ 150 kg ha-1 resulted in maximum values for plant height (87.66 cm), number of tillers m-2 (265.17), spike length (13.05 cm), number of spikelets spike-1 (22.02), number of grain spike-1 (68.21), seed index (48.80 g) and grain yield (4320 kg ha-1). In varieties, Benazir showed its superiority over its companion variety with 82.91 cm plant height, 224.17 tillers m-2, 10.52 cm spike length, 18.21 spikelets spike-1, 53.00 grains spike-1, 45.29 g seed index and 3649.50 kg ha-1 grain yield. The commercial variety TJ-83 ranked 2nd with 78.33 cm plant height, 207.75 tillers m-2, 11.42 cm spike length, 19.82 spikelets spike-1, 57.31 grains spike-1, 40.98 g seed index and 3143.20 kg ha-1 grain yield. It was observed that treatment interaction N @150 kg × variety Benazir proved to be effective treatment and variety combination for achieving higher wheat yields; while, variety Benazir showed its genetic superiority yielding higher than its companion variety TJ-83.
Keywords— Growth parameters, grain yield, Nitrogen, wheat.
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