| Summary: | 碩士 === 國立屏東科技大學 === 土木工程系所 === 101 === Pomacea Canaliculata was introduced in 1979 as the edible snails; however, further it was abandoned. Because it has no threat from natural enemies, it spread rapidly around the ditches, ponds and paddy fields resulted loss in agricultural yields and ecological disaster. Based on organic agriculture and ecological protection considerations, this study used tea seed kernel and sapindus that residual from natural plant extracts to prevent Pomacea Canaliculata. By using pH value as measurement basis, pH of 0.2 g, 1 g, 10 g, 50 g, 100 g five different concentrations on heating test and natural exposure test were determined.
Result of experiments showed that tea seed kernel are acidic substances on heating test and natural exposure test , and the final value of pH are 4 and 4.5 when the concentration was increased 0.2g to 100g ; while the same situation on sapindus which rendered weak acid substances, and pH are 5.3 and 6. Both of these substances have significant effectiveness in killing Pomacea Canaliculatas. Concerning on environmental impact, tea-seed waste release acid to waters in environment while sapindus release weak acid in environment which is less threatening in soil and water. Therefore sapindus which has same effectiveness with tea-seed waste was selected instead of tea-seed waste as substrate to kill the Pomacea Canaliculata in paddy fields.
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