Boro-Mino Boron Fertilizer 1 kg by Bioag. OMRI Listed. Boro-Mino is a water-soluble boron fertilizer derived from soy protein hydrolysate and boric acid. It is a fine, free-flowing, hygroscopic, spray-dried powder that contains short chains of amino acids in peptide form, derived from enzymatic hydrolysis of non-GMO soybeans.