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Irrigation control system

  • US 4,548,225 A
  • Filed: 09/09/1982
  • Issued: 10/22/1985
  • Est. Priority Date: 09/28/1981
  • Status: Expired due to Term
First Claim
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1. An irrigation control system for irrigating a predetermined number of different agricultural fields comprising:

  • for each of said fields main distributing means for distributing water to the field from a water source including main valve means for controlling the flow of water from said water source to said main distributing means;

    at least one unitary tensiometer means in each of said fields for sensing soil moisture to such field having a liquid filled vacuum port, such vacuum being indicative of the amount of soil moisture and including solid-state electrical means physically connected to said vacuum port for providing a continuous real time quantitative analog electric signal indicative of the amount of such moisture;

    automatic control means connected to said main valve means and responsive to said analog signals for initiating the flow of water to a field in response to said analog signal coinciding with a first preset "START" value and for discontinuing such flow of water in response to said analog signal coinciding with a second preset "STOP" value different from said first value.

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