TY - BOOK AU - Artuti A M AU - Hasan Z AU - Ramilus TI - Rubber seed viability on different size and presoaking duration KW - Germinability KW - Rubber seed KW - Seed Viability N2 - A study to identify appropriate type of seed sizes and pre soaking duration in order to high seed viability in rubber seed was done at SMK_2 Batusangkar green house, West Sumatr from August to October 1997. A factorial in Randomized Complete Block Design with three replications was used in experiment. The factors were seed sizes ( Small=220 seed/488 g/l, middle= 175 seed/462 g/l and big= 123 seed/401 g/1) and pre soaking duration (0 hour, 24 hours abd 72 hours). The results showed that the highest seed viability was found in the middle or bigger sizes (5.8 g and 6.05 g seedling dry) and the seeds were presoaking in water about 48 hours (germination rate 3.39 percent/ day) ER -