GROWTH AND YIELD OF WHEAT AS AFFECTED BY AMOUNT OF IRRIGATED WATER UNDER VARYING SOWING TIMES

Abstract

The experiment was conducted during the period from November 2014 to March 2015 in the experimental field of Sher-e-Bangla Agricultural University, Sher-e-Bangla Nagar, Dhaka to find out the effect ofamount of irrigated waterunder varying sowing times on growth and yield of wheat.The experiment comprised of two factors; Factors A: Irrigation (3 levels): I : Irrigation upto field capacity; I 2 : Irrigation upto 1/2 of field capacity and I : Irrigation upto1/4 th of field capacity(at crown root initiation, flowering and grain filling stage); Factor B: Sowing time (4 levels at 10 days interval): S 1 : Sowing at 10 November, 2014; S : Sowing at 20 November, 2014; S 3 : Sowing at 30 November, 2014and S : 10 December,2014. The experiment was laid out in Split Plot Design with three replications. Irrigation was assigned in the main plot and sowing date was assigned in the sub-plot.Irrigationupto fieldcapacity (I 1 ) recorded the highest plant height, tillers hill -1 4 and all yield contributing and yield parameters and the lowest in irrigation upto 1/4 th of field capacity (I ).November 20 sowing (S 2 ) produced the highest results than that of November10 sowing (S 3 ).Due to cumulative action of irrigation upto field capacity(I 1 ) and November 20 sowing (S 1 ) the combination effect (I 1 1 S 2 2 ) recorded the highest values in spike length(36.72cm),number of spikelets spike (17.60), number of grains spike -1 (54.13) , 1000 grain weight (55.15 g),grain yield (3.97 t ha -1 ), straw yield (4.31 t ha -1 ) , biological yield (8.280 t ha -1 ) and harvest index(47.93%) respectively. Due to poor performance of individual treatment of irrigation upto 1/4 of capacity (I 3 ) and November 10 sowing time (S 1 ) the combination I 3 S recorded statistically the lowest grain yield (2.75 t ha -1 ), straw yield (3.17 t ha -1 1 3 2 ) , biological yield (5.92 t ha - ) and harvest index (46.42%).

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