实验组和对比组时间的平均数差异经过t检验，在0.05的水平上具有显著性。
The mean difference of the post-test was significant at the 0.05 level.
通过对模型进行数理统计检验，在显著性水平大于5%的条件下，其预测值与测定值不存在显著性差异。
The statistical results showed that there was no significant difference between the predicted and found values when the level of significance was over 5%.
经显著性检验，N90，N160和N230处理间的氨挥发通量差异达到显著水平（P<0.05）；
Besides, the differences of ammonia volatilizing flux were significant among N90, N160, N230 treatment(P<0.05).
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