nitrogen phosphorus potassium的用法和樣例：
例句
- A Study on the Rule of Accumulation and Transfer of Nitrogen, Phosphorus and Potassium in Plantago asiatica L.
江西道地藥材車(chē)前中氮磷鉀的積累轉運規律研究。 - It's a economical way to make compound fertilizer named Potassium Phosphate, Using carnallite and wet phosphoric acid by double decomposition reaction.
用光鹵石和濕法磷酸通過(guò)復分解反應生產(chǎn)磷鉀復合肥料是較經(jīng)濟的方法。
