▎ 摘　　要

NOVELTY - Plant growth regulator comprises 5-15 pts. wt. nano silica, 10-30 pts. wt. graphene oxide and 2-4 pts. wt. salicylic acid. USE - Plant growth regulator for planting Chinese milk vetch by nitrogen fixation (all claimed). ADVANTAGE - The plant growth regulator can improve the nitrogen fixation ability and yield of milk vetch. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method of using the plant growth regulator, which involves spraying the plant growth regulator for 2-4 times on the foliage of plant during the plant seedling stage, and interval between two adjacent sprays of 2-4 days, when the plant turns green, spraying the plant growth regulator for 2-4 times on the leaf surface of plant, and the interval between two adjacent sprays of 2-4 days.