Nitrogen, phosphorus, potassium are essential macro elements to plant growth, and also commonly used fertilizer in agriculture.
其中氮、磷、钾是植物生长必需的大量元素，也是农业生产中常用的肥料。
Nitrogen, phosphorus, potassium are essential macro elements to plant growth, and also commonly used fertilizer in agriculture.
其中氮、磷、钾是植物生长必需的大量元素，也是农业生产中常用的肥料。
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