Title: Heterogeneity Analysis of the Irrigation in Fields with Medium Size Sprinklers
Abstract: In order to determine the main factors that affect the water application at field
level using solid set systems (experimental plots and actual irrigation installations),
more than 300 tests have been carried out with different types of sprinkler-nozzlepressure.
Radial leg tests have been previously performed to find the water distribution
pattern. Afterwards both outdoor single-sprinkler and block irrigation tests have been
also performed to know the water distribution pattern distorted by wind action.
Results show that the main factors to be controlled are: the radial application rate
distribution pattern, the sprinkler spacing, the time of irrigation and the riser height. For
a certain sprinkler the radial pattern is determined by working pressure, nozzle and use
or not use of the jet-straightening vane (VP) within the main nozzle. The main factor
not controlled is wind speed (W). Results also show that higher Coefficients of
Uniformity (CU) are attained with two nozzles than with a single nozzle under low
wind speeds. VP must be incorporated for wind speed higher than 2 m/s with the aim of
reducing the depletion of uniformity. A single nozzle must be used when the secondary
nozzle has an incorrect design and then producing a big proportion of small-size drops.
Publication Year: 2000
Publication Date: 2000-03-01
Language: en
Type: article
Access and Citation
Cited By Count: 9
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