Level Of Economic Efficiency Of Water Use In Various Commodity Farming In The Ground Water Irrigation Network In East Lombok District
Halimatus Sa^diyah, Anas Zaini, and Rifani Nur Sindy Setiawan

University of Mataram

Abstract

Abstract. To overcome the problem of water resource scarcity, the NTB Regional Government has built several groundwater irrigation services in East Lombok Regency. Considering that the construction of groundwater irrigation schemes (pump wells) requires quite a bit of investment, the facilities built by the government must be utilized maximally for the prosperity of the people. In general, the aim of this research is to develop guidelines for allocating irrigation water resources for several commodities, as well as formulating fair irrigation service tariffs for farmers. Specifically, the objectives of this research are to: 1) Estimate the production function of each commodity grown by farmers and derive the marginal product function. 2) Evaluate the level of efficiency of water resource allocation under status quo conditions. 3) Formulate guidelines for efficient allocation of irrigation water resources according to economic principles. 4) Formulate fair tariffs for farmers. This research will be conducted in East Lombok Regency on the grounds that East Lombok Regency has the largest number of groundwater irrigation service schemes. The selection of respondents was carried out using stratified random sampling by considering the elements of location/distance of land from water sources (irrigation networks), area of land ownership and types of commodities cultivated. Land location is divided into 3 strata, namely Upper, Middle and Lower areas- The area of land ownership is categorized into large land ownership (> 1 ha), medium land ownership (0.5 < L < 1), and narrow land ownership (< 0.5 ha), while commodities that use irrigation water are corn, tomatoes, chilies, shallots and tobacco. Thus there are 45 categories (3 categories of land distance x 3 categories of ownership area x 5 categories of commodities). The number of samples for each category was set at 3 farmers, so that at each research stage there were 135 samples of farming units. The data collected includes production input data such as land area, seeds, fertilizer, pesticides, labor, amount of water allocated, prices of all inputs including irrigation service tariffs, production quantities and output prices. Data were analyzed using an econometric model using the Cobb-Dauglass function model and analyzed with SAS software. The results shows that: 1) the production function of 4 commodities can be formulated as follows:
Y=3,735 X_1^(-0,0537) X_2^0,3398 X_3^(-0,131) X_4^0,5114 X_5^0,3160 X_6^0,3038(Corn),
Y=4,3528 X_1^0,236692 X_2^0,4774 X_3^(0,0399) X_4^0,5851 X_5^0,0826 X_6^0,5148 (Shallot)
Y=6,5622 X_1^0,9352 X_2^0,0047 X_3^(-0,7314) X_4^0,1555 X_5^(0,5139) X_6^0,2203 (Chili)
Y=52,0203X_1^(-0,6513) X_2^1,0025 X_3^(-0,1039) X_4^(-0,2051) X_5^(-0,0173) X_6^(0,1477) (Tobacco)- While from the Efficiency Analysis show that the use of irrigation water in corn and chili farming is not yet efficient, so it is necessary to add irrigation water from 3998 m3 per hectare to 6000 m3 per hectare for corn, and from 5260 m3 per hectare to 7075 m3 per hectare. Meanwhile, the use of irrigation water in shallot and tobacco farming is no longer efficient, so its use needs to be reduced from 4235 m3 per hectare to 3658 m3 per hectare for shallots, and from 3343 m3 per hectare to 1524 m3 per hectare for tobacco.

Keywords: Economic efficiency, groundwater irrigation

Topic: Agricultural Socio-economics