Until now, the rate of population growth still reaches 1.49 percent or about four million people per year. In line with the increasing need for food makes the demand for agricultural land is increasingly urgent. Therefore, coastal land which has a wide area in Indonesia can be utilized for agricultural land. However, coastal land has some limitations, such as porous marginal land and high content of salt in the air. An innovation is need to improve land capacity, especially in dealing with particularly subject related to salt content in the water, which interfere with the growth of the plant. The aim of this study is to improve the ability of early warning irrigation system through the development of sensors to measure salinity in the air. The experimental site was located in Samas coastal agricultural land, Bantul Regency. This research use sensor of salt content, salt trap, ECmeter and distillated water as control. In this study, salt content sensor based on EC (electrical conductivity) method was used to measure salt level in the air. It was determined from correlation analysis between salt concentrations, voltages in the salt trap, and time. In addition, sensor calibration was done in the in the Laboratory of Land and Water Resources Engineering by using voltage data and salt concentration from data logger, so that the salt content in the air can be quantified. The results of measurements with SenSoRam, a sensor innovation to measure salt content in the air by the electrical conductivity method, indicates a strong correlation of the reading of the salt sensor with ECmeter measurement (R2 = 0.99 and R2 =0.96). This information will be used for early warning irrigation system in coastal agricultural land. Furthermore, it will be useful for water saving of fresh water in coastal areas, eco- friendly agricultural system and an environmental sustainability.