Abstract
Allelopathic compounds are secreted into the environment by living plants or released from dead plant tissues. The basic release routes of allelopathic substances by donor plants are secretion from the roots, washing out of compounds by water, emission of volatile substances and destruction of tissues during the decomposition of plant material. These observations led to the principles of crop sequence. A two-year study was carried out at Sids Agric. Exp. & Res. St., ARC, Beni ‐ Sweif governorate, Egypt, during 2011/2012 and 2012/2013 seasons to study the allelopathic effects of sorghum and Sudan grass on berseem, faba bean, fodder beet, onion, sugar beet and wheat crops. This experiment included 18 treatments which were the combinations of fallow, sorghum and Sudan grass as preceding crops and six winter field crops (berseem 'Trifolium alexandrinum ', faba bean 'Vicia faba' , fodder beet 'Beta vulgaris ', onion 'Allium cepa ',
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