دور مواعيد الزارعة وفترات الري في مكونات حاصل و حاصل حنطة الخبز

الملخص 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 the effect of sowing dates and irrigation intervals on yield and yield components of bread wheat cv.

IPA 99.A randomized complete block design with three replicates with a split-plot arrangement was used.

The three sowing dates (November 20, December 5 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 grain yield (5.03 and 4.82) t.ha-1, number of spikes.m-2 364.09 and 353.33 in both seasons, respectively.

And the number of grain / spike at the first season and the thousand – grain weight in the second season .

The treatment of 2 – weeks irrigation was superior by giving the highest averages of number of spikes.m-2 (361.76 and 356.30), thousand – grain weight(38.65 and 37.48) gm, grain yield (5.20 and4.98) t.ha-1 during the two seasons respectively.

There was a significant interaction between irrigation intervals and sowing dates with the impact in the grain yield and its components.

The combination of 2-weeks irrigation interval with sowing date November 20 gave the highest grain yield (5.71 and 5.49) t.ha-1 , number of spikes.m-2 (382.07 and 373.33) during the two seasons , respectively.

The treatment of 5 – weeks irrigation intervals with sowing date December 20 gave less averages of number of spikes.m-2(291.27and 280.77) , number of grain / spike (57.87and54.37) , thousand – grain weight(33.01 and32.88)gm , grain yield(3.59 and 3.33) t.ha-1 during the two seasons , respectively.

Can be conclude That the combination of 2-weeks irrigation interval with sowing date November 20 gave the highest grain yield t.ha-1 , number of spikes.m-2.

Therefore can be recommend to grow wheat in 20 Nov.

under 2-weeks irrigation interval.