Influence of Allelopathic Substances from Sphenoclea zeylanica Gaertn, on growth of Weeds

Abstract

The allelopathic effects of Sphenoclea zeylanica Gaertn. on growth of weedswee studied at the Weed sciences Branch, Botany & Weed Science Division in 1987. Three concentrations of methanol extract of S. zeylanica 0.1 ,1.0 and 5.0 gm fresh weight wee used to determine the allelopathic effects on growth of 10, 13 and 2 species of grass, broadleaved and sedge, respectively. The results showed that all the concentrations of extrctant solution inhibited the growth of these weed seedling and the inhibitory effects on grasses and sedges were more than broad-leaved wees, Dactylocternium aegyptium (L.) Richt'; Chloris barbata Sw., Pennisetum pedicellatum Trin., Leptochloa chinensis (L.) Nees, Pennisetum setosum L.C.Rich., Hygrophial erecta Hochr., Minosa in visa Mart. and Scirpus articulatus Linn. were the most sensitive species to the lowest concentration of S, zeylanica extractant solution among the tested weeds.