Winter wheat root system drought resistance identification method

The invention discloses a winter wheat root-to-crown drought resistance identification method. The method comprises the following steps of S1, respectively setting a water treatment group and a drought treatment group in a root system observation room under a simulated field environment condition, performing spring irrigation two times by the water treatment group, respectively performing irrigation in jointing and heading and flowering, and ensuring the irrigation amount to be 603/mu; for the drought treatment group, no irrigating on the basis of full seedling emergence; S2, respectively measuring the dry weight of biomass on the ground and the dry weight of the whole root system in the jointing stage and the heading and flowering stage, calculating the root-to-crown ratio, and calculating the drought resistance index RSRDI of the root-to-crown ratio through the following formula: RSRDI = RSRS.T2. RSRS.W-1. RSRCK.W. (RSRCK.T2)-1; and S3, screening drought-resistant varieties based onthe root-to-crown ratio d