Abstract:

In order to explore N forms on licorice growth, yield and quality of influence, and provide the basis for high yield and quality of licorice planting. The solution culture method was used. The growth condition, the content changes of medicinal ingredients, free amino acids, soluble protein and other substances of licorice were compared after the treatment of different nitrogen forms and NO3--N/NH4+-N ratios on licorice. The results were as follows: right amount of nitrate ammonium ratio could improve the yield and quality of licorice. In different ratio of NO3--N/NH4+-N, when NO3--N/NH4+-N for 50/50, root yield, the content of medicinal ingredients, soluble sugar and soluble protein carbon in entire plant synthetic were highest. In three different nitrogen forms, ammonium nitrogen was not suitable for licorice growth; there were no significant differences between treatment of nitrate and urea on root yield; but the treatment of urea had the highest content of medical composition in whole plant.