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Automatic soil-sprinkling arrangements

  • US 3,905,551 A
  • Filed: 03/18/1968
  • Issued: 09/16/1975
  • Est. Priority Date: 03/20/1967
  • Status: Expired due to Term
First Claim
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1. A soil moistening system, comprising in combination, a first isolated electrode, in an upper layer of the soil which is adapted to be moistened, a second isolated electrode in a lower layer of the soil which incorporated a permanent residual moisture, means for measuring the electrical resistivity of the soil between said electrodes and thereby the moisture content of the soil including circuit means connecting said electrodes to a source of electric power whereby to pass electric current from one electrode to the other through the soil between the electrodes, said means being operatively connected to the actuating means of a sprinkler system and being adapted to activate said sprinkler system until the moisture in said upper layer has sunk sufficiently for it to reach the upper surface of the lower soil layer which incorporates permanent residual moisture, said first and second electrodes being substantially spaced from each other in a horizontal direction.

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