20 mule team borax

I have a half acre plot of medium red and white clover. Lots of purple leaves in the clover. Research says it's usually caused by Boron deficiency. Today I bought a 4 lb. box of 20 Mule Team Borax. I filled my 25 gal. sprayer while pouring in the Borax. Mixed in the Clethodim and crop oil and...