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Any tips on treating manganese and boron deficiencies in soil?

My soil tests came back deficient in both. Manganese was 2.85 ppm (recommended range of 4.0-10.0). Boron was .13 (recommended range of .2-.6). I bought this stuff, a liquid, (pic) and mixed up a batch and sprayed it around (near) the plants but I don't know to what degree it has affected the levels. I can't do a $30 soil test every week and both micronutrients can be toxic from overapplication. If anyone has experience with this I would greatly appreciate some advice.

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