Enviroscan or C-probe readings suggest the crop is using 15mm of water a day, how does your System Capacity meet this?
Capacitance probe millimetres are not real millimetres unless it has been accurately calibrated to the field in which it is installed. It is necessary to calibrate your probe to be able to accurately compare your crops Daily Water Use to the System Capacity of the machine otherwise the observed values can be significantly different to actual plant water use values. Furthermmore, probe placement will have a dramatic impact on the reading of Daily Water Use – even moving the probe 150mm away from the plant line will change the reading – hence a single probe reading does not integrate the plant water use over the entire root volume.
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