Abstract: Sri Lanka is mostly famous for agriculture and 39% of Sri Lankan people are farmers in the current era. There are different level of cultivations and different types of cultivations. And there are daily new comers in the agricultural field in present. They do not have proper experience in cultivation. Therefore, those different kinds of cultivations face small to large scale of problems because new farmers have insufficient knowledge about agriculture. Because of those problems, famers can be in an uncertain state about their cultivation. Insufficient knowledge about lands and crops can be a main reason. Since they have less idea about their lands, soil conditions, non-fertile, crops, natural disease, sales problems, etc. This article explains an android and a web based system the supports decisions making in agriculture field. So, with this system farmers can get a good profit as they expected. The system uses data mining and gives most accurate solution to agricultural problems. This is created for spices cultivation in Sri Lanka (Ginger, Pepper, Cinnamon andclove).