A
plant nutrient is prepared by chelating micromolecular
collagen peptide and middle elements and / or microelements, wherein, the molecular weight of the micromolecular
collagen peptide is 1000-5000, preferably 1000-3000. The micromolecular
collagen peptide takes
fishery wastes as a collagen source, the initial molecular weight of the collagen
peptide is 2300000-2500000 units, and an enzymatic directional shear technology is adopted to perform enzymolysis on the collagen
peptide to form the micromolecular collagen
peptide. The
plant nutrient provided by the invention is a new-generation purely natural green agricultural resource and belongs to an efficient and all-
nutrition collagen peptide preparation; and the
plant nutrient has the advantages of no
toxicity, no residue and no
pollution of the traditional nuisance-free biologics, and can improve the
crop autoimmunity and the
crop disease-resistance, and reduce
pesticide consumption. The micromolecular collagen peptide has the functions of promoting
cell proliferation and maintaining the
cell division, and the micromolecular collagen peptide which is chelated with the elements can provide pure natural
nutrition to crops such as fruit, vegetables, grain and cotton and the like to increase the
crop yield and improve agricultural product quality.