Center pivots can be used to achieve variable-​rate chemigation — applying variable dosages of agricultural chemicals through the irrigation system within the same field.

We present three items in our paper:

1) Equations specifying how a center pivot and the chemical injection pump can be operated to vary chemical dosages

2) A software tool to assist with variable-​rate chemigation calculations

3) Field test findings from Brule, Nebraska, that demonstrate the accuracy of a commercial, uncustomized variable rate chemigation system.

Publication: Lo, T.H., D.R. Rudnick, and T.M. Shaver (2019). Variable-​Rate Chemigation via Center Pivots. J. Irrig. Drain Eng. 145 (7): 04019012.

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