Kinerja sistem irigasi pada usahatani padi di daerah irigasi Gadungan-Lambuk, Tabanan=The performance of irrigation system on rice farming in the irrigation aea of Gadungan-Lambuk, Tabanan

ABSTRAK The availability of irrigation water both in terms of quantity and quality was very important in the production process and serves as a determining factor in making rice farming a success. Therefore, operational and maintenance activities with sufficient fund was essential in realizing the sustainability of irrigation system. The aim of this research was to evaluate the performance of irrigation system on rice farming in the irrigation area of Gadungan-Lambuk, Tabanan Regency, Bali. Survey method and observation were employed in this study. Gadungan-Lambuk was choosen purposively, and the sample of farmers was selected based on proportinate random sampling. Descriptive analitical method was made for the indicator of the performance of irrigation system, and analitical statistics on the production function type of Cobb-Douglas by using programmes of LIMDEP and SHAZAM. The findings show that the productivity of the use of the irrigation is 0.96 seen from the indicator of Area utilization (Au)and from Yield, top yielders-based (Yt) was 0,83. Productivity looked at from cropping intensity index (CII) was 0,88 and rice production per unit of water irrigation input (IWO) is 0.35 Kg/m3. And equity achievement of water distribution was around 80%. The value of conveyance efficiency was more than 80%, and the average of technical efficiency rating (TER) was around 88%. However, allocatively, the utilization of irrigation water at Gadungan-lambuk was not efficient as indicated by the value of k(=20,45)>l. This inefficiency occured because of the limitation of the water availability compared with the need level for rice farming, while the price of the water fixed based on AKNOP as much too lower as Rp 2,13/m3. From the laboratorate analysis showed that the quality of irrigation water at Gadungan-Lambuk was feasible to rice farming because the indicators that it measured was lower to the maximum level based on the criteria of quality irrigation water type D. The conclution was that the performance of irigation system at Gadungan-Lambuk was not optimum, particularly looked at from the indicator of efficiency, although the other indicators were sufficiently in support of the smooth running of the irrigation system. It, however, could be very much needed to enhance the performance of the irrigation system, the project of efficiency of operation and maintenance (EOM), and an intensive and comprehensive research should be carried out, for axample, in the form of action one. Keywords: performance â irrigation system â rice farming