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。
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。
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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