. Rai, I. N., C.G.A. Semarajaya, and I. W. Wiraatmaja. 2010. A Study on the FloweringPhenophysiology of Gula Pasir Snake Fruit to Prevent Failure of Fruit-set. Flowering of Gula Pasir snake fruitnaturally occures once every 3 months or four times a year, but only one to two of flowering seasons succeeds toproduce fruit. Fruit-set failure causes the fruit harvest seasonally occurs. This research was aimed to study Floweringphenophysiology of Gula Pasir snake fruit to prevent failure fruit-set and to produce off-season fruit. A randomizedcomplete design with one treatment factor and 20 replications was used in the research. The treatment was floweringseason consisted of three levels i.e. sela I (April), gadu (July), and sela II (October). The research was conductedat a farmer's snake fruit orchard in Sibetan Village, Bebandem Subdistrict, Karangasem Regency, from March toNovember 2009. Variables observed were flower and fruit growth, microclimate, N, P, and K leaf tissue content,and N, P, and K soil content. The data were analyzed by analysis of variance (anova). The results showed that theability of the crop to flowering was the same between season of sela I, gadu, and sela II. However, the percentageof fruit-set at gadu was very low (20.53%) or flower drop was very high (79.47%). Due to unfavorable climaticecondition that was very low total rain day and rainfall. Therefore, the crop did not obtain sufficient water, that wasindicated by the lowest relative water content on leaf. Off-season fruit production of Gula Pasir snake fruit of couldbe established by decreasing the percentage of flower drop by utilyzing irrigation as the substitution of low totalrain day and rainfall.