增施磷、钾肥对大花蕙兰炭疽病防治效果的影响

通过施用3种不同氮、磷、钾比例的肥料并结合常规药剂防治，对大花蕙兰黄金小神童炭疽病防治效果进行比较试验。结果表明，增施钾肥的N：P(P2O5)：K(K2O)=15：15：30]和增施磷肥的N：P(P2O5)：K(K2O)=15：30：15]防治效果显著，防治效果分别达到76．54％、73．71％，显著高于未增施磷、钾肥的(N：P(P2O5)：K(K2O)=15：15：15]防治效果(47．79％)，说明增施磷、钾肥有助于提高对兰花炭疽病的防治效果。

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

Nitrogen,phosphate and potassium fertilizers with various proportion and in combination with conventional agricultural chemicals were applied to Cymbidium Golden Elf'Sundust'for controlling anthracnose disease caused by Colletotrichum orchidearum f.cymbidii.Fertilizers used were a compound fertilizer of N:P 2 O 5 :K 2 O=15:15:15(C),and on the basis of which additional K and P were supplied as N:P:K=15:15:30(A)and15:30:15(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 being76.54%and73.71%,respectively,whereas in treatment C being47.79%.