PERFORMANCE OF WHEAT AS AFFECTED BY TIME OF IRRIGATION AND NITROGEN LEVEL

Abstract

An experiment was carried out in experimental field of the Sher-e-E3angla Agricultural University. Dhaka to investigate the performance of wheat as affected by inie of irrigation and nitrogen level during the winter season of 2009-2010. Five times of irrigation viz, one irrigation at crown root initiation (('RI) stage. one irrigation at maximum tillering stage. one irrigation at grain tilling stage, two in'igations at CR! - maximum tillering stage and three irrigations at CR1 - maximum tillering F grain Idling stage: and four levels of nitrogen viz. 92kg ha". 115kg ha d . 138kg ha" and 161kg ha' were used as variables. The experiment was laid out in a split plot design with three replications. Results showed that time of irrigation and nitrogen level had significant effect on different plant characters, yield and yield components of wheat. When irrigation was applied 3 times at ('RI - maximum tillering filling stage, various plant characters including yield and yield attributes-plant height. spike length. number of productive tillers plant'. number of effective spikes ii12. dry weight plant'. number of spikelets spike - '. number of grains spike", weight of 1000 seeds.grain yield. straw yield and harvest index had maximum values. On the other hand, when the plant characters-plant height and spike length were highest with 161kg N ha'', the yield and yield contributing characters-number of productive tillers plant'', number of effective spikes nf 2 . dry weight plant'. number of spikelets spike', number of grains spike'. weight of 1000 seeds, grain yield, straw yield and harvest index were highest with 115kg N ha'. Signif icantly. highest yield of wheat was obtained when irrigation was applied 3 times at CR1 - maximum I illering grain tilling stage along with the recommended nitrogen dose of 115kg ha".