Mungbean (Vigna radiata L. Widczek) as a potential crop for weed control
1999
Siriporn Zungsontiporn | Payao Seenaunsalung | Cha-um Premasthira(Department of Agriculture, Bangkok (Thailand). Botany and Weed Science Div. Weed Science Sub-division)
Thirty day old mungbean were extracted with methanol as crude extracts and applied to lettuce (Lactuca sativa L.), rice (Oryza sativa L. var. RD 23), barnyard grass (Echinochloa crusgalli Beauv.) and horse purslane (Trianthema portulacastrum L.) seeds at the rates of 1.0, 2.5, 5.0 and 10 g of fresh weight. The result showed that seven days after treatment, root length of lettuce, rice, barnyard grass and horse purslane were inhibited by 95, 77, 75 and 69 percent compared with those of controlled treatment with 1.0 g. Growth of lettuce were completely inhibitec when treated with 2.5 g of extracts, whereas 5.0 g was in case of rice and 10.0 g in barnyard grass and horse purslane. The effects of mungbean root exudation on growth of crops and weeds planted with mungbean of different ages, i.e. 0, 10, 20, 30 and 40 days, were studied. The results indicated that root length of lettuce and rice seedlings were inhibited by 21 and 23 percent, respectively when planted at the same time with mungbean while that of barnyard grass was induce, root lenght being 107 percent. Dry weight of lettuce, rice and barnyard grass grown with 10 day old mungbean was inhibited by 94, 42 and 49 percent, respectively. Growth of crops and weeds decrease with an increasing age of mungbean. These results indicate that mungbean contains allelopathic substances inhibiting and stimulating plant growth. The substances can be released to the environment by root exudation.
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