Effect of N, P, and K fertilizers on sclerotial formation and germination of southern blight of Coptis chinensis / 中草药

ABSTRACT

Objective: To study the effect of nitrogen (N), phosphorus (P), and potassium (K) fertilizers on the sclerotial formation and germination of southern blight of Coptis chinensis so as to provide scientific basis for its integrated pest management (IPM). Methods: Preparation of different concentrations of N, P and K was added into soil and the mycelium and sclerotia were put on the soil, and then the effect of the fertilizers on the sclerotial formation and germination was observed. Results: The treatment of CO(NH 2)2 and NH4HCO3 had significant inhibition on sclerotial formation and germination. The treatment of NaH 2PO4, KCl, and KNO3 showed the facilitation in various degrees to promote the sclerotial formation and germination. The treatment of KH2PO4 had no significant effect on sclerotial germination, but it had significant inhibitory activity to sclerotial formation. Conclusion: In the production, the partial N, while less K and P fertilizers should be put to control the sclerotial formation and germination of southern blight of C. chinensis.