Title: Control Methods of Troublesome Weeds in Upland Rice Cultivation
Abstract: This research was conducted to establish controlling methods for troublesome weeds in the upland rice culture by using soil and foliar application herbicides. The effect of pre-emergence herbicides on occurring weed species in upland rice culture was pendimethalin(1,585g ai ha-1)> linuron(500g ai )>butachlor(1,464g ai ). However, the controlling effect was poor with pendimethaline for Acalypha australis, linuron for Digitaria ciliaris, and butachlor for Acalypha australis, Capsella bursa-pastoris, Chenopodium serotinum, and Veronica didma. On the other hand, the controlling effect of a foliar application herbicide, pyribenzoxim(300g ai ) was excellent for Portulaca oleracea, Rumex crispus, and Veronica didma, but was relatively poor for Amaranthus lividis and Chenopodium serotinum. Whereas the effect of bentazon plus cyhalofop-butyl(1650+300g ai ) was excellent for the control of Chenopodium serotinum, Persicaria hydropiper, and Portulaca oleracea, it was also poor for Acalypha australis and Veronica didma. In order to control the most troublesome weeds which is Acalypha australis in upland rice culture, we applied a foliar application herbicide, pyribenzoxim, at various rates. Pyribenzoxim applied to 0.7-1.5 leaf stages at the recommended rate controlled the Acalypha australis completely. In contrast, the bentazon plus pyribenzoxim at the recommended rate(1,600+300g ai ) controlled 93% of the total amount of Acalypha australis. The herbicidal efficacy of pyribenzoxim when applied to 3.5-4.5 leaf stages was lower than when applied to 0.7-1.5 leaf stages. The controlling effect of Acalypha australis was only 86% when applied to 3.5-4.5 leaf stages using a higher rate(600g ai ) of pyribenzoxim
Publication Year: 2004
Publication Date: 2004-01-01
Language: en
Type: article
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