Comparative Performance of Mung Bean (Vigna radiata L.) Under Different Types of Water Condition Gatdula, Clair and Concepcion, Maricel EDUC B Science Teaching and Testing, Faculty of Education, University of the Philippines Open University Abstract This study was done to observe the effect of different types of water in the germination and growth in terms of length and number of leaves of mung bean ( Vigna radiata L.). 40 mung bean seeds per water type were placed equidistantly on 8-ply paper towels in petri plates (plastic containers) and were moistened daily with distilled water (control), isotonic water (pH 3), hard water (water from deep well) and alkaline water (pH 9,ionized water). Plates were covered and stored in a well lit area and at room temperature. Daily observations were done, data that were gathered were: number of mung bean seeds germinated, length of sprouts + roots, and number of sprouts with leaves. Other observations such as the presence of molds, curling of sprouts and drying up of root tips were also noted, recorded and photographed for 5 days. Results showed that the different water types have a significant effect on mung beans’ germination and growth. However varying the type of water used did not affect the germination of mung bean seeds, all seed samples germinated in a span of 4 days. Among the different types of water used, hard water or deep-well water was the most suitable water type for growing mung bean plants. Keywords: mung bean, distilled, isotonic, ionized, hard water, alkaline, germinated