论文部分内容阅读
佛罗里达东南部的一个试验,在104株粗柠檬砧的凤梨橙[Citrus sinensis(L)Osbeck]中,1974～1980年期间,树龄为5和11年生,有31株发生了枯萎病(Citrusblight)的病状。每年四月肉眼测定和树干木质部的取样分析呈现木质部含锌量提高(>5ppm),并且在3株枯萎病树中有42%的植株同时发生肉眼可见病状,而在这一部分的植株中又有29%,10%和13%的植株,分别在产生可见病状的12个月,24个月和36个月,其树干木质部就有很高的含锌量,所有发生枯萎病的植株的含锌量(>～25ppm)都高于无病健株(1～6 ppm)。
One experiment in southeastern Florida found that in 104 citrus oranges [Citrus sinensis (L) Osbeck] with rough lemon anvil, the tree ages were 5 and 11 years old during the period 1974-1980 and 31 were withers Symptoms. Macroscopical measurements and sampling analysis of the trunk xylem in April each year showed an increase in zinc content (> 5 ppm) in the xylem and 42% of the 3 wilt disease trees simultaneously showed macroscopic pathologies, while in this part of the plant there was again 29%, 10% and 13% of the plants, respectively, had significant zinc content in the xylem of the trunk xylem at 12 months, 24 months and 36 months of the onset of visible symptoms, respectively Quantities (> ~ 25ppm) were higher than those of diseased plants (1-6 ppm).