矿质营养对柠檬流胶病的影响

INFLUENCE OF MINERAL NUTRITION ON LEMON GUMMOSIS

柠檬流胶病树与不流胶树叶片的矿质元素含量不同。流胶病树Ｎ含量高，Ｋ、Ｂ含量和Ｋ／Ｎ比值低（＜０．４），Ｎ／Ｂ比值高（＞７００）。不流胶树叶片Ｋ／Ｎ比值≥０．４５，Ｎ／Ｂ比值＜６００。Ｋ和Ｋ／Ｎ比值与流胶病的发生呈显著负相关。Ｂ与Ｎ／Ｂ值对流胶病发生分别呈一定负相关和正相关。不流胶树叶片的多酚氧化酶活性高于流胶病树叶。提高柠檬叶片Ｋ、Ｂ含量，适当控制Ｎ含量，不仅有利于防治流胶病，还可提高果实品质。

There was a great difference in the mineral elements contained in the leavesfrom gummosis-infected tree and no-infected tree. The infected samples possessed,howev-er,a higher level of nitrogen and ratio of nitrogen/bore,as well as a lower level of potassi-um and bore and ration of potassium/nitrogen.The no-infected samples presented K/N≥0.45 and N/B≤600;otherwise,no-infected samples showed K/N<0.4 and N/B>700.Theinfection efficiency correlated significantly and negatively to K and K/N and somewhat toBof the samples;but it correlated,to some extent,positively to N/K.The activity ofpolyphenol oxidase in the infected samples was higher than that in no-infected samples, wecould suggest that the lemon gummosis would not only be controlled by increasing the fo-liar contents of K and B and by limiting the N level,but the fruit quality would also be im-provedat the same time,This trial affords us theoretical evidence for the lemon gummosiscontrol with the regulation of mineral element contents and an appropriate proportion inthe tree.