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两种规格的扩散皿测定土壤铵态氮的结果差异达到了极显著水平.直径较大的扩散皿测定铵态氮的结果比较高.
Differences between the two kinds of diffusion vessels for the determination of ammonium nitrogen in soil reached the extremely significant level. The larger diameter diffusion vessel was more effective for ammonium nitrogen determination.