2013年4月10日,在河北省保定市望都县苹果园考察时发现,当地许多果园正给苹果幼树输营养液(图1),每棵小苹果树上都挂着一套输液装置,有些是拔掉针头已废弃的人用输液器,有些是做工简陋的果树专用输液袋,输液装置有些挂在苹果树枝上,有些在小树旁用竹竿支撑,塑料插头均插在树干基部高出地面1~2cm的地方。经测量发现塑料插头直径在0.4~ On April 10, 2013, when examining apple orchards in Wangdou County, Baoding City, Hebei Province, many orchards in the region found that they were losing nutrient solution to young saplings (Figure 1). An infusion set was hung on each apple tree, Some are unplugged needles with infusion needle removed, some are poorly made fruit trees for infusion bags, some are hung on apple branches, others are supported by bamboo poles, and plastic plugs are inserted at the base of the trunk Ground 1 ~ 2cm place. The measured plastic plug diameter of 0.4 ~