Effect of interaction between rate and period of spray of Propanil herbicide on weed of rice

ABSTRACT

To study the effect of rate and period spray of Propaneil herbicide on weed of rice such as [Echinochloa Crusgalli and E. colonum], a Field experiment was conducted at AL-Garma [Thi-Qar Governorate/Iraq] for two year [2000-2001] by using [R.C.B.D.] in split plot design with four replicates. The main - plots were included four rate of herbicide Propaneil [1.5, 2.5, 3.5, 4.5] Liter/donum, while sub-plots were included four treatment during three stages of weed growth, [2-3 leaves, 4-6 leaves and 6-8 leaves] and control. The results showed significant differences between rate and period of Propaneil herbicide. Also the results gave that all herbicide treatment were efficient in lowering the numbers of weeds compared to the untreated [control] treatment. The best combination was [2.5 liter/donum of herbiade x stage of weed growth 2-3 leaves] gave the highest yield of seed rice which was 928.5 and 915.6 ton/donum for 2000 and seasons. There was a significant effect for rate and period spray of Propaneil herbicide on growth, plant yield and its components