试验结果表明：对烤烟产量起主要作用的是氮肥用量，密度与留叶数的互作。
The experimental results showed that nitrogen levels and interaction between the density and the number of reserved leaf were significant in yield.
试验结果表明：对烤烟产量起主要作用的是氮肥用量，密度与留叶数的互作。
The experimental results showed that nitrogen levels and interaction between the density and the number of reserved leaf were significant in yield.
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