Title: Hormesis influence of glyphosate in between increasing growth, yield and controlling weeds in faba bean
Abstract: This study investigates the response of faba bean and associated weeds to the low rates of glyphosate (1.4, 2.8, 5.6, 11.2, 22.4, 44.8, and 89.6 g a.i./feddan) corresponding to 0.3, 0.6, 1.2, 2.4, 4.8, 9.6, and 19.2% of the usage rate (0.467 kg/feddan), respectively. Two field experiments were conducted in this regard during two successive seasons (2008/2009-2009/2010). The plants were sprayed once and twice, 5 and 15 weeks after sowing. Generally, the one foliar application treatments were more effective in increasing faba bean growth than the two foliar application treatments. The best results obtained were for the concentration 11.2 g/feddan, especially sprayed as once. Plant height, fresh and dry weight as well as yield and its components were significantly increased in response. Total protein and carbohydrate contents were unaffected by the treatments. Weeds in converse were negatively affected recording the highest inhibition rate at the concentration 11.2 g sprayed also as once. It has been suggested that the low doses of glyphosate can induce faba bean growth, and this could indirectly affect weeds growth. [El-Shahawy, T.A. and Faida A.A. Sharara (2011). Hormesis influence of glyphosate in between increasing growth, yield and controlling weeds in faba bean . Journal of AmericanScience. 7(2):139-144].