Field Assessment of Allelopathy Properties of Rottboellia cochinchinensis on Growth Inhibition of Weeds
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Abstract
Farmers in Chae Hom, Lampang, northern Thailand, have been cultivating itchgrass (Rottboellia cochinchinensis) as a mulching material to control weeds in the vegetable fields. Field observation of an allelopathy properties of itchgrass grown at farmer’s field was conducted. This study investigated the suspected allelopathic influence of itchgrass on the densities of sedge, grasses and broad-leaved weeds. The allelopathy properties of itchgrass-infested soil on the growth of test plants was tested. Results showed that the itchgrass-infested soil provided better control of some weed species than the itchgrass-uninfested soil. Cultivated itchgrass decreased the weed density in the vegetable fields. Field assessment of the allelopathy properties of Rottboellia cochinchinensis on the growth inhibition of test plants showed that the itchgrass-infested soil also highly inhibited the growth of test plants such as Bidens pilosa and Echinochloa crus-galli. Furthermore, the physicochemical properties of the itchgrass-infested soil and the itchgrass-uninfested soil was determined. This study was no obvious difference in the physicochemical properties between the itchgrass-infested soil and the itchgrass-uninfested soils. However, the organic matter in the itchgrass-infested soil was higher than those in the itchgrass-uninfested soil. These results suggested that itchgrass had an allelopathic influence on density and growth of weeds in the field conditions. Therefore, allelopathic activity of itchgrass will provide information crucial in enabling improvements in the basis of weed control to reduce the use of herbicide in sustainable agricultural systems.
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