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USING WATER EXTRACTS OF SOME ALLELOPATHIC PLANTS ACCOMPANIED WITH A REDUCED RATE OF GLYPHOSATE FOR CONTROLLING BROOMRAPE IN FABA BEAN

A field experiment was conducted on an Orobanche naturally infested soil at Sakha Agricultural Research Station Kafr El Sheikh, in 2017/2018 and 2018/2019 seasons aiming at combating Orobanche crenata in faba bean through using water extracts of fenugreek, coriander and sorghum crops, each at a concentration of 10% weight/volume at a rate of 20 litres/fed mixed with glyphosate (48%) at a reduced rate (40 cm3/fed) compared to the recommended rate of the same herbicide (75 cm3/fed). Treatments were foliarly applied twice at 50 and 70 days after sowing. Two faba bean Orobanche tolerant cultivars (Misr 1 and Giza 843) and a susceptible one (Sakha 1) were used in this study. The experiment was laid out in a split plot design with three replications. The cultivars were randomly devoted to the main plots while broomrape control treatments were randomly arranged in the sub plots. The results showed significant reductions in Orobanche spikes number and weight at harvest on the three cultivars due to all treatments applied with no significant differences among them. Misr 1 and Giza 843 cultivars were inferior to Sakha1 cultivar in number and weight of broomrape spikes/m2, but they were superior in yield and its components. Therefore, foliar application of either fenugreek, coriander or sorghum plant extracts as donor allelopathy at a concentration of 10% w / v at a rate of 20 litres mixed with glyphosate herbicide (48%) at a rate of 40 cm3 / fed applied twice 50 and 70 days after sowing can help in controlling Orobanche crenata and improve faba bean yield especially for susceptible genotypes.