Effects of Organic Materials on Growth of Rice and Paddy Weeds

The purpose of this research is to investigate impact of the organic mixture materials (OMM) and mixture oil cake (MOC) on the early growth of direct-seeded rice, transplanted rice, Echinochloa crus-galli (Echinochloa crus-galli var. formosensis Ohwi.) and Aneilema keisak Hassk. Direct-seeded rice and transplanted rice are both treated with 0.63~1.88ton ha-1 organic mixture materials and mixture oil cake respectively. The mortality rate in direct-seeded rice was 42.1~71.2% and 30.0~85.2%, whereas growth of transplanted rice was improved 8.1~25.7% and 2.8~11.0%. Direct-seeded rice and transplanted rice are both treated with 1.88ton ha-1 organic mixture materials and mixture oil cake respectively. The weed that died about 52.8% and 38.9% was Echinochloa crus-galli, and the root of the weed was suppressed by 81.9% and 83.1%, the shoot by 53.1% and 60.5%. Small quantities of organic mixture materials and mixture oil cake also were highly effective in controlling Aneilema keisak Hassk. The organic materials have significant inhibition effect on direct-seeded rice, Echinochloa crus-galli and Aneilema keisak Hassk after 0~3 days, 0~5 day and 0~7 days treatment. The dissolved oxygen increased evidently as the time pass after treatment. The oxidation-reduction activity continued to increase rapidly. These results suggest that the organic mixture materials and the mixture oil cake seems to contain an active ingredient that are effective in killing weeds.