Title: EFFECT OF SOME HERBICIDES ON ANNUAL GRASS AND BROAD LEAVED WEEDS IN MAIZE CROP 2- Phytotoxic effect of some herbicides on maize crop
Abstract: Two trials were conducted during 2010 and 2011 summer seasons in Tahanoub area, Qualubia Governorate, Egypt, to evaluate the phytotoxic effect of different doses of the new selective herbicide Equip 22.5% OD (foramsulfuron + isoxadifen-ethyl) against annual grassy and broad leaved weeds in maize (Zea mays L.) fields compared to the recommended herbicide by the Egyptian Ministry of Agriculture; Starane 20% EC (fluroxypyr) and manual hoeing.The results showed that when Equip was applied at the recommended dose (750 cc/fed.), it increased chlorophyll a, b and the total chlorophyll content of the treated maize leaves significantly compared with the other treatments at 7, 14 and 21 days after treatment (DAT) during the two growing seasons.When Equip was tested at the double rate it showed a significant reduction in the total chlorophyll content compared to the other treatments.Data showed that Equip at the recommended rate as well as hoeing treatment increased maize shoot dry weight significantly compared to Equip applied at the double dose and the untreated check.Also, Equip at the recommended rate increased cob weight significantly more than the other treatments and recorded the highest cob weight being 363 and 170.71 g/cob followed by hoeing (352.5 and 146 g/cob) and Starane (310 and 129.71 g/cob), at the 1 st and the 2 nd season, respectively, while Equip at the double dose showed the lowest significant effect.