The influence of herbicides on major field crops in the newly reclaimed areas of egypt part 2 effect of post emergence application of herbicides on wheat cotton maize and rice seedlings

Shaalan, M.I.; El-Khishen, A.A.; Nassef, O.B.

Libyan Journal of Agriculture 6(1): 203-212


Accession: 006697625

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Atrazine, linuron, 2,4-D, trifluralin, fluometuron, molinate and propanil at 5 concentrations each were applied. A numerical grade scale (0-10) was used in evaluating the effects on the seedlings. Maize seedlings did not resist the postemergence application of trifluralin, fluometuron, molinate, propanil and linuron at all concentrations, except the lowest rate (0.5 kg/f; f = faddan = 4200 m2) of linuron and fluometuron. The seedlings resisted 2,4-D and atrazine at the low rate but died after 15 days when higher rates were used. Wheat seedlings failed to resist all concentrations of trifluralin, propanil, molinate, fluometuron, linuron and atrazine (except the lowest rate of 0.5 kg/f). The seedlings differed in the degree of resistance to 2,4-D, i.e., they were completely resistant at the rates of 0.5, 1.0 and 2.0 l/f, but were completely killed after 15 days at the rate of 4.0 l/f. Propanil, molinate, 2,4-D, trifluralin and linuron had no effect on rice seedlings at all concentrations except the high ones (12.0 l/f, 7.5 l/f, 4.0 l/f, and 4.0 kg/f, respectively). However, rice seedlings did not resist all concentrations of atrazine and fluometuron, applied postemergence, except at the lowest rate. Cotton seedlings were injured by propanil, molinate, 2,4-D and atrazine at all concentrations. On the other hand, they resisted trifluralin (at the rates of 0.5 and 1.0 l/f) and fluometuron (at the rates of 0.5 and 1.0 kg/f) but were severely injured by the higher rates. The rates higher than 0.5 kg/f of linuron injured cotton seedlings.