主茎总叶数的变化是量测小麦春化反应性的一个可靠指标。
Finalleaf number on main stem could be a reliable measure for wheat vernalization response.
叶片数量及叶数增长率的变化暗示物质生产的变化和投入目标的变化。
Number of leaves and its increasing rate implied that the change of the matter production and invested target.
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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