Mapping cation exchange capacity and exchangeable potassium using proximal soil sensing data at the multiple-field scale

Cation exchange capacity (CEC – cmol (+) kg−1) is the capacity of a soil to hold exchangeable cations, one of which is exchangeable potassium (K). The data from both CEC and exchangeable cations are frequently useful for fertiliser recommendations; however, they are expensive to measure in the labor...

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