Abstract: Using 4 Chinese rose(Rosa chinensis) varieties Schloss Mannheim, Carefree Wonder Shrub, Eiko and Black magic as materials,the changes of electrolyte extravasation rate of leaves under different low temperature stresses after nitrogen fertilization were studied,in order to determine the influence of fertilization on the cold resistance of Chinese rose. Logistic equation was used to determine their semi-lethal temperature(LT₅₀). The results showed that with the temperature decreased, the electrolyte extravasation rate of the four varieties showed a S-shaped cure, the LT₅₀ of Schloss Mannheim, Eiko and Black magic treated with nitrogen fertilizer were lower than that without nitrogen fertilizer.

Key words: Chinese rose(Rosa chinensis), fertilization, semi-lethal temperature, cold resistance