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All Journal Jurnal Agritech
Anasiru, R.H.
Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

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Pendayagunaan Irigasi Airtanah Menunjang Budidaya Tanaman Secara Produktif pada Lahan Kering

Agritech Vol 22, No 4 (2002)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

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Abstract

The utilization of shallow groundwater well to support cropping pattern in dry land area should be directed to increase land and water productivities through proper irrigation management and effective operation of groundwater irrigation pump. By the concept that a certain plant needs a certain amount of transpired water through its leaves to produce 1 kg dry product during its production cycle, an attempt is done to determine technical and economic aspects of the groundwater irrigation system to utilize water and energy efficiently by improving the conjunctive use of rainfall and groundwater irrigation in dry land area. A set of centrifugal pump (ɸ 2") was used to lift water from the shallow groundwater well at total head of 22 m (Suction head = 12 m and delivery head = 10 m) and was used to irrigate maize, peanut and onion crops. The result obtained indicateds that the introduced technology is suitable to be applied at farm level. In order to reduce operational cost of pump, simulation was done to determine the most appropriate planting achedule using computer simulation model. By taking planting schedule back approximately 2 weeks reducing annual irrigation requirement of 500 to 600 m3/ha and reduce annual operation pump of 66.5 hour/ha/year. Advanced analysis using economic feasibility analysis indicates technology introduced suitable to applied with B/C ratio = 1.25 (maize), 1,83 (peanut) and 2,36 (onion).

Kesesuaian Hubungan Antara Jenis Pompa, Sumber Air, dan Tanaman yang Dialiri

Agritech Vol 16, No 2 (1996)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

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Abstract

The research was conducted at Belawa, Wajo, South Sulawesi during dry season 011994/1995. Furrow irrigation system was used on the research. Axial type pumps were used to lilt water from creek at depths of 2 m, whereas centrifugal type pumps lifted water from the shallow well groundwater at depths of 15 m. Both type of pumps were used to irrigate soybean and maize crops with the total area for each plot of 500 m2. Maize and soybean were irrigated using furrow. Axial pump diameters and engine powers during the research were the following: 4" (6 HP), 6" (8 HP), and 8" (10 HP) respectively; while 2" (4 HP), 3" (5 HP), 4" (10 HP) for centrifugal pump. Objective of the research was to optimize benefit income from pump operations based on type of pump, irrigation type, source of water, land preparation, type of crop (s), irrigation efficiency, and yield. Results of the research shows that optimum performance among the centrifugal pump was achieved by pump diameter of 4" with optimum discharge 11.8 1/s, furrow length of 110 m, and cost of water Rp. 85.555, /season. Centrifugal pump type is suitable for soybean crop irrigation. Optimum benefit for axial type pump was obtained by PS-1 with the discharge of 35 Vs, length of furrow 180, cost of water Rp. 40.650,-/season, and suitable for maize irrigation