December 2022 - 27
IRRIGATION & WATER MANAGEMENT
the average of all data (24 emitters).
The team found that some areas in
the field were under-irrigated due to
clogged emitters. The team also has
found some leaks causing a " ponding, "
shown in Figure 3.
Uniformity can be evaluated at
least once a year. If the distribution
uniformity is less than 85%, we suggest
checking your drip irrigation system.
Here are some checklists.
* Ensure your irrigation system
runs at the correct water
pressure. Operating outside of
the specified water pressure of
your drip tubes can result in
poor distribution uniformity.
Also, note that the longer the
drip tube, the greater the water
pressure loss due to friction.
* Inspect the emitter if it is
clogged. Emitters can be clogged
by many things such as sand,
mineral deposits, insects and
water quality (high calcium
carbonate and iron in your water
source). Consider flushing the
lines regularly and watch for
contaminants.
* Check for equipment wear. Drip
Figure 2: MSU Irrigation Lab conducted irrigation distribution evaluation in a
blueberry farm (West Olive, MI).
emitter orifices and sprinkler
nozzles wear over time. Pressure
regulators can fail. We suggest
keeping records of all systems
inspections and repairs.
For a center pivot irrigation
system, consider replacing
the whole sprinkler package if
there is a growing number of
malfunctioning sprinklers.
* Check for leaks. In most cases,
leaks can be found by visual
observation. Take a look at the
pipe joints, missing sprinklers,
between fittings and holes on
your drip tapes.
The U.S. Department of Agriculture's
Natural Resources Conservation Service
Figure 3: Leaking drip tube can cause
ponding.
has an Environmental Quality Incentive
Program (EQIP) that supports the
upgrade of irrigation systems if the
system has poor distribution uniformity.
USDA NRCS EQIP 441 and 442 are for
micro-irrigation and sprinkler systems,
respectively. You may contact your local
USDA NRCS (www.nrcs.usda.gov/)
office for more information. VGN
VegetablegrowersNews.com
VGN | DECEMBER 2022 | 27
http://www.nrcs.usda.gov/
http://rispensseeds.com
http://www.VegetablegrowersNews.com
December 2022
Table of Contents for the Digital Edition of December 2022
December 2022 - 1
December 2022 - 2
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