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本文于落叶前向苹果树根外追施矿质肥料，落叶后采样测定了氨基酸、可溶性糖和Ｐ、Ｋ、Ｂ、Ｃａ的含量。结果表明，喷含Ｃａ２＋、Ｋ＋、ＳＯ２－４、Ｈ２ＰＯ－４、ＮＯ－３及尿素等肥料均使粗根中氨基酸含量下降，除ＳＯ２－４外其它肥料能促进氨基酸由长枝下运至根系；ＫＮＯ３、Ｂ使根枝中可溶性糖含量增加，而Ｋ２ＳＯ４、ＣａＳＯ４、Ｃａ（ＮＯ３）２、ＫＨ２ＰＯ４使其含量下降；根外追肥促进Ｐ在粗根和枝条中贮存，其效果依次是：ＫＨ２ＰＯ４＞Ｋ２ＳＯ４＞尿素＞ＫＮＯ３，ＫＨ２ＰＯ４、尿素促进Ｃａ在短枝中的贮藏；Ｂ在喷肥后略有减少；根外追肥对Ｋ＋在粗根贮藏影响不显著。
In this paper, before the deciduous apple tree roots to topdressing mineral fertilizers, deciduous samples were determined amino acids, soluble sugar and P, K, B, Ca content. The results showed that all the fertilizers except Ca2 +, K +, SO2-4, H2PO-4, NO-3 and urea decreased the content of amino acids in the crude roots, while other fertilizers except SO2-4 could promote the transport of amino acids from the long branches to the roots ; KNO3, B increased the content of soluble sugar in roots and decreased in K2SO4, CaSO4, Ca (NO3) 2 and KH2PO4; topdressing fertilizer promoted the storage of P in coarse roots and shoots with the following order: KH2PO4> K2SO4> urea> KNO3, KH2PO4 and urea promoted the storage of Ca in the short branches; B decreased slightly after spraying; the effect of top dressing on the storage of K + in the coarse roots was not significant.