Earlier quoted context omitted.
At least in Texas raising property taxes as such isn't the answer. Rather capping the amount a single owner/organization can claim in ag/etc exemptions, while making it easier for small 20 acre farms to claim the exemption. Right now what you have is the richest land owners paying the lowest rates, while owners of tiny suburban/rural lots get murdered. For example, I give you a few pieces of the 6d ranch, located on…
No one is doing any commercially meaningful farming (not even for a small business) on 20 acres. Consider for grazing use 2-6 acres per cow is needed. 4 cows, isnt even a blip. Nor can you farm most crops meaningfully on 20 acre plots either. On lot 1, most of the taxed value is derived from the improvements, not the land itself.
Perhaps your definition of crop is too narrow. Something like hops is well suited to "commercial" sizes starting at 20 acres.[1]
Vineyards supplying a co-operative? 20 acres of fruit trees for boutique cider production?
I think there's probably quite a few examples of 20 acre crops which are sustainable commercially.
[1] "...EU competitive hop farms (more than 10 ha of hops) ..." https://www.dlib.si/stream/URN:NBN:SI:DOC-CWQINAJR/eaf94387-...