تأثير الحش و المعاملة بالأثيفون في صفات نمو و حاصل حنطة الخبز (Triticumaestivum L.)‎ المزروعة بمواعيد مبكرة

Abstract EN

A field experiment was conducted during the winter season (2014-2015) at one of the farmers field in Annana region / Hilla / Babil (Latitude N and Longitude East) The experiment was arranged with split plot in a Randomized Complete Block Design with three replications.

Planting dates (D1, D2, D3) occupied the main plots, While, treatments of growth regulation (control (C0), clipping (C1), ethephon (C2), ethephon + clipping (C3)),occupied the sub plots.

The result showed that Planting date in November 18(D3) had the superiority in grain yield amounted to 3.871 tons.

ha-1 due to high values of grain yield components (i.e.

number of spikes and the number of grain .

spike-1 and weight of 1000 grain) which could be attributed to the increasing of the flag leaf area, dry leaf weight, spike length, compared with the Planting date in October 18 which gave (1.982 tons.ha-1) and the Planting date in November 3 when they gave the lowest values in all the aforesaid traits; however, both of them gave the highest hight of the plant .

Application of ethephon (C3) caused a significant increase in grain yield (an average) of 3.774 tons.

ha-1 compare to the control (3.435 tons.ha-1) due to its superiority in one of the main components (number spike.m-2) which amounted 328.25 spike.m-2.Application ethephon in November 18 gave highest grain yield..