不施氮处理土壤氮素矿化量在各生育期均显著高于施氮处理；

The soil mineralized N at each tobacco growth stage was significantly higher in the control than in the N fertilization treatment.

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因此，建议在有机质含量和速效氮较高的植烟土壤上少施或不施饼肥。

So we suggest that if the soil has high organic matter contents and available nutrient, it should applied less or no cake fertilizer.

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