EFFECT DIFFERENT CONCENTRATIONS OF HERBICIDE TRIBENURON-METHYL (GRANSTAR) ON SOME TRAITS OF GROWTH AND PRODUCTIVTY OF WHEAT(Triticum eastivum L.).

Abstract

The aim of the present study is to investigate the effect of time of application of herbicide tribenuron-methyl (granstar) in high concentrations on the growth and productivity of wheat seed Triticum aestivum L .varity (IPa-95). The experiment contain tow factors. The first factor, concerns with the time of application (early and late) and the other ones is different concentrations of herbicide (0.0% (distal water),0.5%,0.8%,1%)(g/ml).The results showed that a significant decreasing at 0.05 level of significance in growth and yield components except for number of stomata (no./mm2) when herbicide was used in a high concentrations. On other hand , early application of herbicide led to a significantly decrease for the height of plant (cm) , spike length (cm) and chlorophyll a (mg/gm tissue) compared with late herbicide application . However , there is no significant effect to the herbicide concentrations on all traits when its application (early and late). Moreover , the interaction between the two factors (concentrations x applications) were significantly high on all parameters including chlorophyll a and b at only in early application . .At the last applied that the inhibition effect from herbicide concentrations in the early application was more obvious on plant height , spike length and chlorophyll a than at late application of herbicide .