This data is just as important as keeping tabs on the weather and the chemicals that were sprayed. I would just like to add a comment to this as Number one, it is important to keep record of GPA of water sprayed for chemical activity or inactivity and secondly, when we add a product like a ph reducer or foliar application of a bio stimulant or surfactant, sometimes these are added as a % of gallons sprayed and not on a per acre basis, therefore if GPA changes the product usage will change accordingly with the GPA. A surfactant is always based on % of water.
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edited the Idea above instead and cannot delete the comment I made