Emolaga, Carlo Sollorin, Magaye, Marie Drances Therese Biboso, Paras, Richard Susmuran ( March 1999)
Philippine Science High School Western Visayas Campus – Department of Science and Technology (DOST-PSHS WVC), Brgy. Bito-on, Jaro, Iloilo City 5000, Philippines
ABSTRACT
The utilization of different concentrations of gmelina fruit extract ( gmelina phillipinesis ) used as a herbicide was tested on three weeds : cyperaceae ( Cyperus brevifolius ), gramineae ( Eleusine indica ) and makahiya to compare their varying herbicidal effects under laboratory conditions. Concentrations of gmelina fruit extract were 25%, 50%, 75%, and 100%. Distilled water was used as the solvent and the control.
Effects were observed 6-21 days after herbicide application. As the concentration of gmelina fruit extract increases, the herbicidal effects on cyperaceous and Gramineae also increases. However, all the concentration don’t have significant herbicidal effect on makahiya. At 5% level of different concentrations of gmelina fruit extract can be summarized in the order distilled water <25% = 50% < 75% < 100%. The herbicidal effect on cyperaceae is in the order.