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For most Florida soils, an average of ¾ inches of water a week is sufficient to replenish the grass. You can measure this with tuna fish or other flat-bottom, wide-mouth cans. Place five to seven of these throughout the irrigation zone to be operated. Water until the depth of water in each can is ¾ inch. That's how long that zone needs to be run once a week in summer and once every two to three weeks during the dry months.
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When to irrigate can be determined two ways. These are by visual and physical inspection and by direct measurement of soil moisture.
Visual and physical inspection: The most efficient way to water your lawn is to irrigate it when it shows signs of stress from lack of water. Visual signs of water stress include the lawn turning a bluish gray color, footprints lingering after being made and grass blades folding in half.
Direct measurement of soil moisture: One way to measure soil moisture is with a soil moisture sensor. Sophisticated sensors will activate your irrigation system when water is needed. The more basic soil moisture sensors turn off your irrigation system when water is adequate.