Fuente: WIPO Agriculture Portada The invention relates to a tourmaline plant growth promoter and aims to provide the tourmaline plant growth promoter (microelement fertilizer) meeting organic agriculture or green agriculture. The promoter does not contain any chemical substance forbidden by the organic agriculture or the green agriculture. The promoter (microelement fertilizer) has the characteristics of safety, broad-spectrum insect prevention, strong roots and seeds, durable growth promotion and the like. The tourmaline plant growth promoter is prepared by mixing tourmaline fine powder, food-grade chitosan or chitosan oligosaccharide and auxiliary materials. The tourmaline plant growth promoter has the advantages of: making full of tourmaline resources, particularly the tourmaline resources with less value and low grade; providing the efficient and safe plant growth promoter (microelement fertilizer) for the organic agriculture or the green agriculture; and improving the competitiveness of agricultural products.