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盆栽试验结果表明，玉米、油菜和黑麦草等植物能够直接利用片麻岩中的矿物结构钾。不同种类的植物对矿物结构钾的利用能力有显著差异，而且矿物粒径的变化对钾的植物有效性影响很大。
Pot experiments showed that plants such as corn, rape and ryegrass could directly utilize the mineral structure of potassium in gneiss. Different kinds of plants have significant differences in the utilization of potassium in mineral structure, and the change of mineral particle size has a great influence on the availability of potassium.