Abstract
This study was carried out at Abu Jarash Farm and Weed Laboratory, Faculty of Agriculture, Damascus University, during 2017 winter to investigate the integrated effect of the non-selective herbicide Glyphosate (360 g/l) (Lancer®) and plant extracts of some weeds: sorghum (Sorghum bicolor L.), alfalfa (Medicago sativa L.) and bermuda grass (Cynodon dactylon L.) by using one third and one fourth of the recommended doses of the herbicide mixed with plant extracts for weed management of plots planted with carrot. The integration between herbicide and plant extracts led to 100% weed control when the herbicide was used at 25% of the recommended dose, and was equally effective to that of the recommended dose. The benefits are cost reduction and decrease of harmful effects of synthetic herbicides to the environment. On the other hand, Sorghum bicolor extract was significantly effective in controlling all tested weed species (82.1% effectiveness on Chenopodium album (most sensitive), plant height of wild barley Hordeum murinum L. was 3.8 cm, dry matter content of 4.96% for purple nutsedge, Cyperus rotundus L. and 6.58% for hairy amaranth, Amaranthus retroflexus L. Keywords: Integration, herbicides, plant extracts, reduced doses, weeds
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