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Check pressure, make sure adequate pressure is available - if not, the Centre Pivot will
not irrigate uniformly. It is suggested moving the pivot
to the highest elevation point and placing an accurate gauge on the end of
the machine.
Monitor the pressure each irrigation season. If the
pressure begins to decrease, this can be a sign of problems with the
pumping equipment or other problems in the water delivery system.
If wheel track
problems are anticipated or become an issue, use different tyre sizes or
products that wrap around the tyres and spread the weight of the pivot
(see pictures).
Other options to avoid wheel track issues, initially design the machine
with shorter span lengths to reduce the weight on the tyres.
To keep water
away from the wheel tracks, using boom backs or use 180o sprinklers
around the wheels (see
pictures).
The soil profile should be near field
capacity before peak water use to avoid plant stress. If irrigation is started too late, meaning
subsurface moisture becomes depleted, to catch up will cause to force the
speed of the system and to run the Centre Pivot every day. In this case
the application rate will be really small, most of the water will be
evaporated during irrigation and the wheel tracks will be damaged, as
well. It is important to monitor the soil moisture and to set the right
application rate (via speed) according to the current soil moisture. The
soil moisture sensor can be hooked up to the Centre Pivot's control panel,
which can start or stop the irrigation.
Irrigation should occur overnight, when wind
drift and evaporation losses are minimal. |