Response of vicia faba [Brood bean] Plant to preplanting soil incorporation with different rates of topogard and enide herbicides

ABSTRACT

The effect of two common herbicides viz topogard SOWP a triazine and enide SOWP [amide family] on growth of the various parts of broad bean [Vicia faba] seedlings was investigated. Pre-emergence application of both herbicides resulted in stunted growth of shoot and root and decrease of the seedling dry matter, particularly with "enide". Necrosis and chlorosis appeared on the leaves of enide-treated seedlings only. Nitrate uptake and nitrate reductase activity [NRase] were markedly suppressed, specially in enide-treated seedlings. This suppression may be related to a disturbance of the NO3 transport system as well as to the inhibitory effect of the herbicide on enzyme synthesis. Treatment with these herbicides decreased the total carbohydrate and nitrogen contents of seedlings, presumably due to an inhibitory effect on photosynthesis and protein biosynthesis in Vicia faba seedlings