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Assessment of Different Wheat Varieties Under Various Nitrogen Levels
Abstract
The correlation between nitrogen (N) application and yield of different wheat varieties was determined at the farms of University of Agriculture Peshawar. Three different wheat varieties viz Pirsabaq 2103, Galaxy and Insaf were grown at five different N levels viz. 0, 40, 80, 120 and 160 kg N ha-1 under randomized complete block design with three replications in split plot arrangements. Mineral fertilizers such as Urea source was used for nitrogen (N), DAP source used for phosphorus (P) and SOP source used for potassium (K). Plant growth and yield as well as soil and plant N at different growth stages and its uptake by wheat significantly increased with N application. However, maximum 1000-grain weight, grains per spike, total biomass and straw yield was recorded at 80 kg N ha-1 whereas maximum grain yield was observed 120 kg N ha-1 when the data was averaged across the varieties. Insaf was the tallest variety with more straw yield whereas Galaxy was shortest with minimum straw yield. Pirsabaq 2013 superseded other varieties in term of grain weight, grains per spike and grain yield. Straw and grain [N] and as well as total uptake of N by wheat linearly increased with each increment of N level and showed correlation with soil N recorded at tillering, boot and grain filling stages. However, soil and plant N did not show significant correlation with wheat yield. This study indicated that owing to different N requirement and difference in yield potential a generalized correlation among the soil and plant N with yield potential could not be established.
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