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Grower C realises after doing a few run off tests, that things like the volume of water put through the medium is different to what he tested with the other day.
Grower C sees a change in the readings, due to the amount of water already being held in the medium. And sees that there is a differencer depending on how dry the medium is, how much water is put through, the rate of which the water goes through the medium.
So Grower C, takes a soil sample and mixes it with water in a container and gets a more accurate reading. Realising this reading is quite different to the run off, he improves his plants health and increases his yeild.