Question: How much boron should I use on corn and cotton rotation ground that tests low in boron and high in calcium? Is foliar the best way to apply it?
Answer: The amount of boron needed will depend on your soil test, but typically soil applications of 5 lb/A to 10 lb/A of a 10-15% boron product (0.5-1.5 lb/A actual boron) will be adequate. Follow your soil application with an in-season tissue test to verify that you’re applying the proper rate. If you’re struggling to increase the boron content of the tissue sample in the sufficient range from your soil-applied application, you may need to apply foliar treatments.