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为合理配置烟草品种NC55大田生育期,采用田间对比试验,设置4月25日、5月5日、5月15日3个移栽期,研究不同移栽期对NC55叶片发生进程的影响,明确有效积温与叶片发生的关系,并建立Richards生长动态模型。结果表明,不同移栽期并没有改变烟草最终叶片数目,但对叶片发生动态规律有明显影响,各部位叶片发生时间均随移栽期推迟而缩短,但不同处理的中、上部叶发生所需有效积温无显著差异。建立了烟草叶片发生动态模型,R~2值均在0.980以上,表明模型准确度很高;移栽期主要通过调控参数B值、K值和N值对叶片发生进程进行调控;有效积温综合模型的准确性好于生长时间综合模型;烟草叶片发生模型是只有缓增期和快增期的不完整“S”型生长曲线。
In order to reasonably dispose the growth period of tobacco varieties NC55 in field, three transplanting periods were set up on April 25, May 5 and May 15 to compare the effects of different transplanting periods on the occurrence of NC55 leaves. Effective accumulated temperature and the occurrence of leaves, and establish the dynamic model of Richards growth. The results showed that different transplanting periods did not change the final leaf number of tobacco, but had obvious influence on the dynamic rule of leaf. The leaf emergence time of each part was shortened with the delay of transplanting, but the middle and upper leaves of different treatments needed No significant difference in effective accumulated temperature. The dynamic model of tobacco leaves was established with R ~ 2 values above 0.980, which indicated that the model was highly accurate. During the transplanting period, the process of leaf development was controlled mainly through the control parameters of B value, K value and N value. The integrated model of effective accumulated temperature Is better than the synthetic model of growth time. Tobacco leaf emergence model is an incomplete “S ” growth curve with only slow and rapid increase.