银杏氮素营养诊断技术研究

Research of technique on the nutrition diagnosis of nitrogen applied to Ginkgo biloba L.

应用果园调查、土壤植株化验分析与大田氮肥施用量试验相结合的方法 ,对银杏氮素营养诊断技术进行了研究。结果表明 ,土壤氮素的最佳诊断形态为土壤有效氮 ,其诊断指标 (mg/kg)为 :高 >115 .2 ,中 78.8～ 115 .2 ;低<78.8。银杏植株氮素营养诊断最佳诊断时期为 7月 ,最佳诊断部位为长枝条 8位叶 ,诊断形态为全氮 ,其诊断指标 (N % )为 :高 >2 .0 4、中 1.80～ 2 .0 4、低 <1.80。

Using the way of joining the investigation in the orchard,chemical analysis and experiment of applying amount of the nitrogen fertilizer in the fields to study on the technique of the nutrition diagnosis of nitrogen in Ginkgo biloba L. The result shows the best diagnostic form in soil is available N of soil. The diagnostic index (mg/kg) is: high>115.2, middle 78.8～115.2 and low <78.8. The best diagnostic period of the nutrition diagnosis of nitrogen in Ginkgo biloba L plant is in July and the best position is in the 8 th leaf of reverse order in the long branch. The diagnostic form is total nitrogen. Its diagnostic index (N%)is: high>2.04, middle 1 80～2.04 and low<1.80.