The agile approach, the idea of dividing a project into a set of increments and carrying them out iteratively, comes to solve traditional approach problems. This approach which brings together a set of methods such as Scrum, eXtreme Programming (XP), etc., on the one hand, is becoming too important in the software development industries. On the other hand, the emergence of the Internet of Things poses an obstacle to agile development because the IoT project contains two parts: software, and hardware (i.e., its specificity at the level of project implementation). All this leads the management teams to produce and propose solutions to deal with this type of project. Among these methods, they are scalable methods based on the agile approach, especially Scrum. However, the IoT company teams find them complex, and they offer their own methods later called Ignite | IoT methodology and IoT methodology. These methods are monolithic, and they are based on the traditional approach. Hence, the proposal of a method that meets all requirements of the project and the team remains a major need in the labor market. In this paper, we will propose a hybridization of agile methods and IoT method named Hybrid SIX (Scrum, Ignite, XP). Then we will validate the method Hybrid SIX in a case study "Smart Irrigation", an intelligent system which facilitates irrigation task, that is one of the important cases in Smart Agriculture.