استجابة بعض أصناف حنطة الخبز لمواعيد الزراعة و فترات الري

Abstract EN

A field experiment was conducted at the farm of Dept.

of Field Crop Sciences, College of Agriculture, University of Baghdad, during 2008-2009 and 2009-2010.

That was to study performance of some growth traits of bread wheat under sowing dates and irrigation intervals for IPA 99 variety.

A randomized complete block design with three replicates with a split-plot arrangement was used.

The sowing dates (November20, December5 and December 20) occupied the main plots, while irrigation intervals (2, 3, 4, and 5 weeks) occupied the sub plots.

Results showed superiority of the sowing date November 20 in giving the highest averages of number of tillers/m2 422.00 and 413.88 , plant height(100.79 and 98.12 )cm, flag leaf area (42.88 and 39.83) cm2, biological yield (14.82 and 14.63) t.ha-1, and harvest index (33.81 and 32.89)% during the two seasons respectively .

The treatment of 2 – weeks irrigation was superior by giving the highest averages number of tillers/m2 (429.85 and 415.21), flag leaf area (44.54 and 41.56) cm2, biological yield (15.37 and 14.95t.ha-1 and harvest index (33.81 and 33.28%) during the two seasons respectively.

There was a significant interaction between irrigation intervals and sowing dates with the impact on some growth traits.

The combination of 2-weeks irrigation interval with sowing date November 20 gave the highest biological yield (16.24 and 16.02) t.ha-1 , number of tiller.m-2 (461.66 and 439.99) , harvest index (35.16 and 34.38) %during the two seasons , respectively.

The treatment of 5 – weeks irrigation intervals with sowing date December 20 gave less averages of number of tillers.m-2, biological yield , harvest index% during the two seasons, respectively.

Can be conclude that delay of planting with increase irrigation intervals led to decreased biological yield and harvest index.

Therefore can be recommend to grow wheat in 20 Nov.

under 2-weeks irrigation interval to obtain higher biological yield and harvest index.