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Avocado Special Topics – Distribution Uniformity

Avocado Special Topics – Distribution Uniformity. Gary Bender. Mini-sprinklers. Apply anywhere from 4 gal/hr to 30 gal/hr A major drawback, the amount of water placed on the outside 2/3 of the wetted surface may be as little as 1/3 of the amount placed on the inside of the wetted pattern

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Avocado Special Topics – Distribution Uniformity

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  1. Avocado Special Topics – Distribution Uniformity Gary Bender

  2. Mini-sprinklers • Apply anywhere from 4 gal/hr to 30 gal/hr • A major drawback, the amount of water placed on the outside 2/3 of the wetted surface may be as little as 1/3 of the amount placed on the inside of the wetted pattern • We can’t really correct this lack of uniformity under the tree

  3. Efficiency of Water Application • Distribution uniformity in a grove is the uniformity of water application to each tree • This is the “measure of the efficiency of an irrigation system” • 100% DU is perfect….each tree gets exactly the same amount of water • Because of pressure losses in lines and uneven terrain, we never get a DU this high

  4. Why is DU important? • If the DU is low, we have to irrigate the whole grove more in order for each tree to get the required amount of water • This means that some trees will get a lot more water than they need

  5. How to measure DU • If you have 100 emitters, identify at least 12 that you will check • Catch water out of each emitter into a graduated cylinder, for 15 seconds each • Arrange the results from low to high • Add them all up and get the average • Average the amounts from the “low quarter”, (1/4 of the emitters putting out the lowest amounts) • Divide low quarter avg by avg from all emittters • Multiply by 100 to get %DU

  6. What to do about a low DU • If it is less than 80%, do something! • Make sure you have enough water for the irrigation blocks in your grove • Routine maintenance • Check for leaks, backwash filters, flush lines, may have to chlorinate or acid wash the emitters • Make sure all emitters are the same • Coyote damage!---the puppies love to chew

  7. Also • Set up lateral lines with a pre-set pressure regulator, this will solve the problem of water going up the hill and losing pressure • Be careful what you put in your fertilizer tank, some chemicals will precipitate and clog all of the emitters

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