Sue Ellen T. Abad, Athenes Joy P. Presno, Aida Rose E. Villanueva (February 2000)
Philippine Science High School Western Visayas Campus – Department of Science and Technology (DOST-PSHS WVC), Brgy. Bito-on, Jaro, Iloilo City 5000, Philippines
ABSTRACT
Experiments were conducted in order to determine the effect of rice husk ash on the percent mortality of golden snails. Snails within the lengths of less than one inch, one inch and one and a half inch were exposed to varying concentrations of rice husk ash solution within different time periods of 24, 48, and 72 hours. The mid-lethal concentration potential of the rice husk ash solution was determined. Inferential statistical tests used in the study were the One-Way Analysis of Variance for the test of differences, and the Scheffe test for post-hoc analysis.
Rice husk ash was determined to be more lethal to snails of less than one inch in size that snails one inch and one a half inch in size. The percent mortality showed that the ash can kill from 62.5 percent to 100 percent of the less than one inch sized snails while it can kill 12.5 percent to 100 percent of those with one inch size. The ash can also kill 12.5 to 50 percent of the snails with the snails with the size one and a half inch.
There were no significant differences on the increasing concentration of rice husk ash and on the different exposure periods. There was, however, a significant difference on the percent mortality of golden snails in the different concentrations and different exposure periods.