Control of Water Application in Drip Irrigation Based on the Fuzzy Inference

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  • ファジィ推論によるドリップ潅漑の潅水量の制御
  • ファジィ スイロン ニヨル ドリップ カンガイ ノ カンスイリョウ ノ セイギ

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To reduce water application in drip irrigation, a control based on the fuzzy theory has been designed, and examined its validity in field experiments using melon plants. For the measurement of soil water content that is need for the control, the TDR technique was used. The probe of the TDR was set at the distance of 5 cm from a melon stock. This position of the probe was suitable judging from the profiles of measured water content. Water was applied to six drip-lines with different water quantities according to the control conditions and irrigation condition of everyday irrigation or every two-days irrigation. The applied water quantity was estimated from the measured water content and its change from last measurement. As the results; soil water content was controlled reasonably within a narrow range of about 0.06 to 0.12 cm3 cm-3 in any drip-line. Cumulative irrigated water quantity was saved by about 20 to 30 percent of the control (basic application) for everyday irrigation. For every two-days irrigation, the saving of water application more than 50 percent of the control was realized, however accompanied with a little yield reduction. We concluded that the fuzzy control with soil water measurement by using TDR should be very useful for controlling water application, and thus for water saving in drip irrigation.

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