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.
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- 本文于落葉前向蘋(píng)果樹(shù)根外追施礦質(zhì)肥料，落葉后采樣測定了氨基酸、可溶性糖和P、K、B、Ca的含量。 結果表明，噴含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外其它肥料能促進(jìn)氨基酸由長(cháng)枝下運至根系；
