Penerapan Metode Irigasi Hemat Air Untuk Memberdayakan Sumur Air Tanah Dalam Pada Lahan Tadah Hujan Desa Ranakolo Kabupaten Ende

The development of underground water irrigation networks (JIAT) in the rain-fed farm of Ranakolo village is a government's effort to increase farmers' income. However, farmers never use it to consider of losing money due to additional production costs. They concerned on traditional methods of water treatment (TRI) with continuous flooding, and the regional irrigated rice production results which only 4 tons per ha. To overcome the issue , then an application of water-saving irrigation methods seem to be the best solution. The applied method is Alternate wetting and drying (AWD) and Semi-dry cultivation (SDC) combinated with mulch by direct-seeded (Tabela) and 9 day old seedlings. The studied parameters were productivity of rice, water saving and productivity, crop coefficients (Kc) based on the real measurements of evapotranspiration ratio (ETC) and reference evapotranspiration (ETo), and percolation duration. Based on Kc and percolation duration, it then conducted an analysis of irrigation water demand (KAI) on each planting schedule. Determination of ideal cropping pattern was used the analytic hierarchy process (AHP), considering the various alternative of planting schedule. From the determined ratio of water availability and KAI on optimum planting schedule, it then specified the area of land that can be cultivated. Difference of water needs with water-saving irrigation methods TRI has an impact on the suitability and extensive network of land, therefore, it needs to be simulated the network performance by using the WaterNet software. Based on rice productivity, KAI, and production inputs, it then conducted an economic analysis to provide a figure of net benefit obtained gained by the farmers. Methods error treatment of water sluice by using the SDC method had caused similarity on SDC water conditions with AWD, therefore, it was concluded as an AWD result . Considering the customs restriction, it led the method of tabela/seeded rice can not be applied. The results showed such AWD method could improve, in average, the rice productivity of 147%, water savings of 31.6%, and average water productivity of 298% compared to TRI method. AWD watering systems had impacted on the Kc value . Kc AWD 0.5 months during the period had grew by 0.6