Effects of Increasing Phosphate and Potassium Fertilizers on the Control of Cymbidium Anthracnose

Abstract:

Nitrogen, phosphate and potassium fertilizers with various proportion and in combination with conventional agricultural chemicals were applied to Cymbidium Golden E1f 'Sundust' for controlling anthracnose disease caused by Colletotrichum orchidearum f. cymbidii. Fertilizers used were a compound fertilizer of N:P₂O₅:K₂O=15:15:15(C), and on the basis of which additional K and P were supplied as N:P:K=15:15:30 (A) and 15:30:15 (B), respectively. No agricultural chemical was applied in D for control. The results indicated that increasing K and P contents in fertilizer significantly enhanced the resistance to the anthracnose, the controlling effects being 76.54% and 73.71%, respectively, whereas in treatment C being 47.79%.