稀土元素在果树生产上的应用经过二年的试验，“常乐益植素”稀土喷施在苹果树和葡萄树叶面上均有明显效果。苹果树在盛花期（５月中旬）、幼果期（６月上中旬）和果实膨大期（７月上中旬）３次叶面喷施，浓度为０．０５％～０．１％的稀土元素（喷施的稀土元素按氧化物含... Rare earth elements in the production of fruit trees After two years of testing, “Changle Yizhi” rare earth sprayed apples and vines have obvious effects. Apple trees in the full-flowering (mid-May), young fruit (mid-June) and fruit expansion period (mid-July) three foliar spray, the concentration of 0.05% to 0.1% Elements (spraying of rare earth elements by oxide ...