Spraying Ca 2+ ,K +,SO 2- 4,H 2PO - 4,NO - 3and Urea on apple tree leaves before leaf abscission, the content of amino acid decreases in thick roots and the fertilizers except SO 2- 4 make amino acid transport from long branches to roots system.

• 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；