Polyglutamic acid, a natural material produced by Bacillus subtilis, is a protective film for the soil, which effectively prevents the loss of fertilizer and water; it releases the high-activity decomposing enzyme decomposes difficult-to-decompose macromolecular substances into usable small molecular substances ; Synthesize a variety of organic acids, enzymes, physiological activities and other substances, as well as other nutrients that can be easily utilized; occupy space advantage and inhibit the growth and reproduction of harmful bacteria, pathogenic bacteria and other harmful microorganisms.