M.A. Thesis:

the effect of wheats dual purpose herbicides residues on morphological characteristics of root in sunflower

Using greenhouse assays, the residues of the residues of Othello OD Total applied one month before sunflower planting on Morphological characteristics of Sunflower root was studied in 2016 at Sabzevar branch, Islamic Azad university. Experiment was conducted as factorial arrangement in a randomized complete block design with three replications. Experimental factors were herbicide type (Metsulfuron-methy +sulfosulfuron (Total commercial name) and Mesosulfuron-methyl ( 7.5g/L) + Iodosulfuron-methyl-sodium (2.5g/L) +Diflufenican ( 50g/L) (Othello commercial name) and herbicide dose (0, 50, 75, 100 and 125% recommended dose (2 lit ha-1). Stem height, shoot dry weight, root dry weight, root diameter, root volume, total root length, root specific weight were measured. The result showed that herbicide type had significant affect on all traits. Othello OD had more damage on plant dry weight, root dry weight, root area, root volume, total root length, root/shoot ratio and root special weight than Total whereas plant height was more affected by Total . Herbicide dose had significant affect on Stem height, shoot dry weight, root dry weight, root diameter, root volume, total root length, root specific weight. Increasing herbicide dose decreased all root morphological characteristics. 125% had the heights and 50% recommended dose had the lowest negative effect on root morphology

Keywords: Otello OD Herbicide, Total, specific root weight