Land use development strategies for the rehabilitation of Gajahmungkur reservoir subwatershed
1995
Murtilaksono, K.
Results of the simulation models indicate land use alternative 4 as the best option. Land use alternative 4 was found to give the lowest erosion rate of 29.61 mt/ha/yr, well distributed Qmax/Qmin of 16, best choice of LVR [land value rating] and LMR [land management rating], and highest farmers' income. Land use alternative 4 is characterized by high quality bench terraces, conserved settlements and home gardens. The cropping patterns consists of paddy-paddy-soybean on irrigated paddy rice fields, paddy-soybean on rainfed paddy rice fields, and peanut-peanut monoculture on terraced upland areas. Land use alternative 4 was found to be economically feasible and highly profitable, the BCR [Benefit Cost Ratio], NPV [Net Present Value] and IRR [Internal Rate of Return] being 1.45, 3,384.0 million rupiah and 68.98 percent, respectively. This best land use option is not sensitive to increases in production cost or reduction in prices of commodities. Increasing the production cost by 15 percent and decreasing the prize by 15 percent of rice, peanut and soybean still gives BCR greater than 1.0 and IRR higher than current interest rate in banks for loans. Food demand of the subwatershed could be met by existing land use of land alternative 4. However, there is need for additional income from perennial crops to provide for other basic living expenses of the farmers. Advantages and disadvantages of other simulation options were discussed and pertinent recommendations were made
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