U.s. borax, part of rio tinto, is a global leader in the supply and science of borates—naturally-occurring minerals containing boron and other elements. we are 1,000 people serving 500 customers with more than 1,700 delivery locations globally. Cal-tech™ amino-chelated liquid calcium (with boron). calcium is the trucker of all minerals and boron is the steering wheel. a premium liquid calcium product utilising amino acid chelation to provide enhanced absorption capacity and bio-promotion. May 17, 2017 · boron fertilizers include borax (11 percent boron) and borate granular (14 percent boron). solubor (20 percent boron liquid) is foliar applied and must be applied at recommended rate for specific crops. application of 9 pounds borax per acre will supply 1 pound boron per acre. for gardeners, about 4 teaspoons borax per 1,000 square feet is equivalent to 1 pound boron per acre. dry boron fertilizers A wide variety of boron fertilizer options are available to you, such as organic fertilizer, nitrogen fertilizer, and boric acid. you can also choose from liquid, powder, and granular. as well as from quick, controlled, and slow. and whether boron fertilizer is humic acid, ammonium nitrate, or calcium nitrate.