Title: Weeding Effects and Tuber Formation of Eleocharis kuroguwai by Weed Control System in Machine Transplanting Rice Paddy
Abstract: This study was conducted to investigate ecology of weed occurrence and to establish its economical weed control system on the paddy field. Rice was continuously cultivated with the same cultivation method and applied sulfonylurea compound herbicides yearly for three years. The main problem weed among annual and perennial weeds was Eleocharis kuroguwai. Occurrence of Eleocharis kuroguwai increased with the passage of cultivated year on machine transplanting paddy. Most of annual weeds including Echinochloa crus-galli were controlled with sulfonylurea compound herbicides in machine transplanting. The control effects of Eleocharis kuroguwai were effective by the application of pyrazosulfuron-ethyl/mefenacet at the early stage of rice and the additional application of molinate/cinosulfuron on 20 days after the first treatment or bentazone SL application on 40 days after the first treatment. The tuber formation of Eleocharis kuroguwai by the additional application of molinate/cinosulfuron was inhibited about 77%, but the dormant rate of old tuber of Eleocharis kuroguwai under soil was higher than the one time application of pyrazosulfuron- ethyl/mefenacet at the early stage of rice. The additional application of bentazone inhibited the tuber formation of about 84%, and the dormant rate of old tuber was low. No weeding plots had been a lot of the old dormant tubers of Eleocharis kuroguwai
Publication Year: 2003
Publication Date: 2003-01-01
Language: en
Type: article
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Cited By Count: 2
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