EFFECT AND FREQUENCY OF APPLICATION OF SOME HERBICIDES ON FIELD BIND WEED CONTROL Convolvulus arvensis L.

The factorial pots experiment was conducted in order to investigate the effect of some herbicides ( Basagran , 250,500 , Glyphosate , 565 , 1250 , Gesagard , 1250 , 2500 cm3 a.i /ha) and unweeded check treatment which applied with different frequency of application ( one , two , three times )which take 20 days interval on control of fieldbind weed in summer season 2006 at Salah Aldeen prov . CRD design with three replicates was used . The significant result showed that all herbicides used were superiority on plant growth if it compared with unweeded cheek treatment . On other hand , two times or three times duration application of herbicides had more effect on plant length than one time of application . However, unsignificant result of different herbicides frequency had been on number of buds, no-capsule , and no-of seeds .