Method for quickly identifying nitrogen surplus of biennial radix notoginsengpanax notoginseng leaves

The invention discloses the technical field of radix notoginsengpanax notoginseng planting and particularly relates to a method for quickly identifying nitrogen surplus of biennial radix notoginsengpanax notoginseng leaves. The method comprises the following steps: 1) analysis of nutrient content of tested soil; 2) selection and transplantation of biennial radix notoginsengpanax notoginseng seedsstrips; 3) treatment of biennial radix notoginsengpanax notoginseng nitrogen fertilizer; 4) measurement of an SPAD value; 5) management; and 6) measurement of nitrogen content and leaf area thereof. Regression analysis is performed according to SPAD values and corresponding specific leaf nitrogen (SLN) data under different nitrogen application rates of the biennial radix notoginsengpanax notoginseng leaves, and a linear regression equation is established to judge the SPAD range with radix notoginsengpanax notoginseng nitrogen surplus so as to quickly identify the nitrogen surplus of the biennial radix notoginsengpanax