تأثير موعد الزراعة و عملية التطويش في بعض الصفات الشكلية و الإنتاجية لمحصول القطن في ظروف منطقة الاستقرار الأولى لمحافظة الحسكة سورية

الملخص EN

This research was carried out during growing season 2014 in Tel Half village (AL Hasaka governorate/Syria) In order to study the effect of sowing date and topping process on some morphological and productivity Traits of cotton (Var.

Halab-90 ), planting were applied in tow dates, the first of date planting took place in 19/4/2014, and the second in 5/5/2014.and applying three methods of topping main stem topping, fruit shoots topping, total topping (main stem topping and fruit shoots topping) in addition to control treatment (without topping), The experiment was design according to spilt plot design with three replication, where main plot allocated sowing date and sub plot allocated topping treatment.

The results showed that sowing in the first date resulted in great increasing in the plant’s height.

On the other hand the plants height was decreased when the topping applied compared to the control (without topping), the plant grown in the first sowing date recorded the highes plants height (96.63 cm).

The number of the fruit brunches in the first sowing date with total topping was the highest (12.33) and the weight of the single balls increased in the first date (4.41 g) and with fruit branches topping (4.65 g) and the weight of single boll was increased under the interaction of first sowing date with fruit branches topping (4.70 g), the highest number of the total balls and the total opened balls and best productivity in the unit area of cotton (fibers+ seeds) when plants grown in the first sowing date with total topping of cotton plants were recorded (24.87 bolls/ plant, 19.73 opened bolls/ plant and 6905.3 kg/ ha respectively).

We conclude from this study that planting of cotton crop (Var.

Halab-90) in 19/4/2014 and applying total topping of plant will improve cotton productivity in the study area.