必需营养元素
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There were 19 metal elements in the seeds, among them 9 were essential nutrient elements.
检测出19种元素，其中必需的营养元素9种，重点比较了必需的微量营养元素的含量。
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Nitrogen (n) is one of the most essential mineral elements and the major limited nutrient for plants.
氮素是植物需求量最大的矿质营养元素，也是影响植物生长的主要营养元素。
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