Efficacy of certain herbicides and their mixtures on cotton weeds and their impact on yield and yield components
2009
Mahmoud, M.S.M. | Sabra, F.S.
A field experiment was carried out to evaluate the efficiency of some herbicides and herbicidal mixtures on cotton (Gossypium barbadense v.Giza 86) weeds and yield for two successive seasons (2007-2008) at El-Beheira governorate. The herbicide treatments were convoy (prometryn+fuometuron), amex (butralin), gesagard (prometryn), harness (acetochlor), convoy (prometryn+fluometuron)+amex (butralin), gesagard (prometryn) + amex (butralin), harness (acetochlor)+amex (butralin), weed free, hand weeding and unweeded check. These herbicide treatments were not recommended on cotton crop. The results revealed that the dominant weed was Common purslane (Portulaca oleracea) in the first season and Livid amaranth (Amaranthus ascendens lois) in the second season. The best treatment which gave maximum weed reduction as well as maximum yield increment was weed free, while best herbicide treatments which gave maximum weed reduction and maximum yield increment were acetochlor and its mixture with butralin. The results showed that acetochlor caused reduction in total weeds valued by 94.1% and 90.2% after 45 and 90 days respectively, in the first season and 93.6% and 91.7 % in the second season, also acetochlor mixed with butralin caused 92.4% and 84.8% total weeds reduction after 45 and 90 days respectively in the first season, and 91.7% and 87.2% in the second season. On the other hand, acetochlor increased feddan yield to be 1.78 ton/feddan (11.28 gintar/feddan) and 1.82 ton/feddan (11.56 qintar/feddan) in the first and second seasons, respectively. compared to unweeded check which gave 0.49 ton/feddan (3.14 qintar/feddan) in both seasons.
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