تأثير التضاد الحياتي لمصادر مختلفة من المتبقيات النباتية للمحاصيل في صفات النمو و الحاصل للحنطة المزروعة بعدة كميات بذار

Abstract EN

A Field experiment was carried out during the winter seasons of 2014 in the directorate of agriculture - Kirkuk to study the effect of different sources of crop plant residues and various wheat seeds rates on growth and yield of wheat var.

Sham - 6 .

A factorial experiment RCBD in three replicates was used .The experiment included two factors , first was crop residues sources (control , wheat , corn , and sunflower residues) which added by 9 tan h-1 before sowing , and the second factor was wheat seed rates (100 , 140 and 180 kg h-1) .

the results revealed that the control treatment significantly surpassed in all characters except no.

of tillers m-1 and 1000 seeds weight which showed on significant differences by the effects of crop residues .

The lowest values found in plants grown under the effect of wheat residues in left area (179.54 cm2) , plant dry weight (2.47 gm) , plant height (100.53 cm) , no.

of spikes m-2 (348.78) , no.

of seeds spike-1 ( 46.22 ) , grain yield ( 2.866 tan h-1 ) and biological yield ( 8.316 tan h-1) .The highest values were recorded in 100 kg h-1 plots in characters left area ( 205.208 cm2) , plant dry weight ( 2.45 gm ) and no.

of seeds spike-1 ( 50.43 ) , while seed rate 180 kg h-1 recorded the highest values in plant height ( 104.86 cm ) , no.

of tillers m-2 ( 408.58 ) , no.

spikes m-2 (384.58) , grain yield (3.45 tan h-1) and biological yield (10.133 tan h-1) .

Interaction between seed rates and crop residues had also significant effect on all characters except 1000 seeds weight and harvest index .

The interaction between control and 100 kg h-1 gave the highest values in left area , plant dry weight , no.

of seeds spike-1 .

Superiority found in plant height , no.

of spikes m-2 , grain yield and biological yield in interaction between control and 180 kg h-1 .