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对化肥中氨态氮的两种测定方法进行了试验，总结了各自的优缺点．在实践的基础上，提出了甲醛法的具体操作步骤，并从理论上做出了推测
The two methods for determination of ammonia nitrogen in fertilizer were tested, and their advantages and disadvantages were summarized. On the basis of practice, put forward the specific steps of the formaldehyde method, and made a theoretical guess