Let me know if my math is wrong but I think you are applying over 2lbs of N/k
200lbs of 4600 x.46 equals 92lbs N divided by 300gal equals .307lbs N/gal X7gal/k equals 2.149/k.
I don't do liquid fert but isnt 2lb/k if N high
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MDA no. 29204 (3C)(6)
