Ag Guardian, a cloud-based app, keeps a running total of the products you've applied to your fields.
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Great for bookkeeping in relevance to the products you use and how much of it.
It is an app that helps me manage and pay for the supplies I use in my fields. It also helps me generate a monthly cost report.
A MUST HAVE to keep track of all products you have applied to your fields. Will drive your manpower and cost lower.