Target Boron Levels
Depending on the crop, but for corn, shoot for 20 ppm in the soil. I have talked with many consultants in the past week and 5 ppm should be plenty. Boron can have negative impacts on soil biology when it gets to high. Many soils routinely test less than 5 ppm and in many cases under 1 ppm.
Read the whole article here http://www.calciumproducts.com/component/k2/item/434-boron-micronutrient-macro-benefit
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