银杏钾素营养诊断技术的研究

Research on the nutrition diagnosis of potassium applied in Ginkgo biloba L. trees

应用果园调查、土壤植株分析与大田钾肥施用量试验相结合的方法 ,对银杏钾素营养诊断技术进行了研究。结果表明 :土壤钾素以土壤速效钾作为诊断形态 ,其诊断指标 (mg/kg)为 :高〉75 0 ,中5 0 1～ 75 0低 ,<5 0 1。银杏植株钾素营养诊断最佳诊断时期为 7月 ,最佳诊断部位为长支条倒 8位叶。诊断形态为叶片全钾 ,其诊断指标 (% )为 :高 >0 95 8,中 0 818～ 0 95 8,低 <0 818。

Using the way of joining the investigation in the orchard, the chemical analysis on soil and plant to the experiment of applying amount of the potassium fertilizer in the fields, a technique of the nutrition diagnosis of potassium in Ginkgo biloba L trees was researched The result showed that the potassium in soil should be the rapid available potassium as the diangnostic fom Its diagnostic mark(mg/kg)were>75 0(high),50 1～75 0(mid),<50 1(low),respectively The best diagnostic period was in July The best position of potassium nutrition diagnosis in Ginkgo biloba L Plant was in the 8-th leaf of reverse order in the long branch The diagnostic mark(%)-high;>0 958, mid:0 818～0 958,low:<0 818