Roots weak, poor absorption capacity. Root flush nitrogen, phosphorus and potassium (20~20~20) water-soluble fertilizer plus humic acid active liquid fertilizer or amino acid active liquid fertilizer plus biofungus fertilizer. Foliar spraying of natural brassinas plus humic acid active liquid fertilizer plus potassium dihydrogen phosphate. Once every 7~10 days, 2~3 times in a row. In order to promote the roots to grow roots and strong roots, and to promote the seedlings to grow seedlings and strong seedlings.