استجابة الرز لمعدلات البذار و مبيدات الأدغال

الملخص EN

A field trial was carried out at Mishkab Rice Research Station, Al-Najaf governorate during the summer seasons of 2008 and 2009 to investigate the effects of seeding rates (120,140,160 and 180 kg.ha-1) and herbicides (control, oxadiazon, propanil and weed-free) on some growth charactristics, yield and its components of Yasamin rice cultivar.

The design used was split plot RCBD with arrangement by four replicates.

The results indicated that the seeding rate 180 kg .

ha-1 was superior in giving the highest values of grain yield, 7.4 and 7.0 ton.h-1 in both seasons, respectively, These increases were due to the highest number of tillers.m-2 (697.3 and 680.9 tillers.m-2), respectively.

Also, this seeding rate gave the highest average of plant height (87.9 and 83.5 cm).

For herbicide treatment oxadiazon gave highest grain yield, 7.5 and 7.2 ton.h-1 in both seasons, respectively, as compared with propanil.

It also gave lowest percentage (7.6 % and 7.8 %) of fertility.

It can be concluded that seeding rate of 180 kg.ha-1 and using oxadiazon was the that best combination effective control of weeds, and the highest grain yield in both–seasons.