Soil optimizer is an autonomous machine that can travel through the fields and analyse in situ samples of soil to give advice to the farmers, or fertilize the soil at the moment. In this project a module of this machine has been studied. In order to find the most optimal method to create an aqueous see through solution, which is a solution that combined with some chemicals is useful for spectrophotometry analysis, different methods have been considered. All the characteristics, materials, procedures, advantages and disadvantages of all the methods have been studied in order to decide which is the best method to be automatized inside the machine. Also a lab test has been performed with the chosen method, in order to check its functionality. Finally, three conceptual solutions have been proposed for the automatization of the aqueous see through solution creation, and a previous calculous of some of the components have been done.