Regulator for promoting growth of root system of transplanted vegetable seedling and preparation method thereof

The invention relates to a regulator for promoting growth of root systems of transplanted vegetable seedlings and a preparation method of the regulator, and belongs to the field of plant growth regulators. The regulator for promoting the growth of the root system of the transplanted vegetable seedling, disclosed by the invention, is prepared from the following components in parts by weight: 6 to 8 parts of humic acid, 5 to 7 parts of indoleacetic acid, 0.8 to 1.2 parts of glycine, 0.3 to 0.5 part of brassinolide, 3 to 6 parts of blue-green algae yeast and 0.1 to 0.3 part of cassava starch hydrolyzed sugar. Wherein the blue-green algae fermentation product is obtained by adopting an enzymolysis and fermentation mode, and the cassava starch hydrolysis sugar is obtained by adopting an enzymolysis mode. Before the vegetable transplanting seedlings are transplanted, the regulator can obviously promote the root growth of the transplanting seedlings and improve the seedling strengthening index; after transplanting,