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Centre Pivot - Operation/Management Hints


 

 
 

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.

 
 
 

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