Figure 4 shows the n-tier application.

图4展示了n级结构。

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Increasing sequence of organism and total N as follow: treatment 1, 2 , 4, 5, 3.

各施肥处理有机质和全氮增加顺序均为：处理1＞处理2＞处理4＞处理5＞处理3。

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Increasing sequence of organism and total N as follow: treatment 1, 2 , 4, 5, 3.

各施肥处理有机质和全氮增加顺序均为：处理1＞处理2＞处理4＞处理5＞处理3。

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