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通过对施磷量和银杏植株不同叶位叶片全磷量及单叶重的测定 ,并进行回归分析。结果表明 :银杏上位叶的全磷含量比下位叶的高 ;单叶重则相反 ,下位叶的比上位叶的高 ;施磷量对叶片全磷量和单叶重有着明显的影响 ,供磷偏低或过高 ,都使叶片全磷含量和单叶重下降 ;长枝条 8、 12位叶的全磷量与施磷量的回归关系达极显著者或显著水平 ,其叶片全磷量能反映供磷水平 ;8位叶的单叶重与施磷量间的回归关系达显著水平 ,其单叶重能反映供磷水平 ;长枝条 8、12位叶可以作磷素营养诊断部位 ,而 8位叶则是最佳部位 ,其叶片全磷量和单叶重可作为磷素营养诊断的指标
Through the determination of phosphorus application rate and the total phosphorus content and single leaf weight of leaves in different leaf positions of Ginkgo biloba plants, the regression analysis was carried out. The results showed that the content of total phosphorus in the upper leaves of Ginkgo biloba was higher than that of the lower leaves, while that in the lower leaves was higher than that of the upper leaves. The phosphorus application had a significant effect on the total phosphorus content and single leaf weight of the leaves, Low or too high, all the leaves of the total phosphorus content and leaf weight decreased; long branches twelfth, 12 leaves of total phosphorus and phosphorus content of the regression relationship was extremely significant or significant level, the total phosphorus content of leaves Which reflected the level of phosphorus supply. The regression relationship between the single leaf weight and the rate of phosphorus application reached a significant level, and the single leaf weight could reflect the level of phosphorus supply. The 8 and 12 leaves with long branches could be used as diagnostic sites for phosphorus nutrition 8-leaf is the best site, and the total phosphorus content and leaf weight of leaves can be used as indicators of phosphorus nutrition diagnosis