Title: Nutrient solution culturing device
Application Number: 200510065110 Application Date: 2000.12.21
Publication Number: 1690699 Publication Date: 2005.11.02
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: G01N22/04;A01G27/00
Applicant(s) Name: Ebara Corp. Address:
Inventor(s) Name: Kamiya Ichiro;Kuroda Tetsuo;Narasaki Yuzo;Ohtsuka
Attorney & Agent: li deshan
Abstract:
    The invention aims at providing a method and an apparatus for measuring the moisture content of the soil in order to enable pF value based control of irrigation in cultivation on the soil, as well as a method and an apparatus which use the first-mentioned method and apparatus to enable pF value based control of irrigation. To attain these objects, the invention provides a method for measuring the pF value (soil moisture tension) of the soil, comprising the steps of (a) preliminarily determining the correlation between pF value and volumetric water content of the soil to be measured, (b) measuring the volumetric water content of the soil, and (c) converting the value of the volumetric soil water content of the soil measured in the above step (b) to the corresponding pF value on the basis of the correlation between pF value and volumetric water content predetermined in the above step (a). The invention also provides a method and an apparatus for controlling the irrigation of the soil based on the measurement of the pF value by said method.
Time: 8
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