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在２４±２℃及２９±２℃的温室中，播种后５～７天子叶出生，子叶寿命为２４～２８天。叶序与真叶出生日期呈直线正相关，平均４．６～４．８天长出一片新叶。随叶位升高，真叶寿命逐渐延长，第１～３真叶寿命为２５～３６天，第４真叶增至５２天以上。烟苗叶位与叶寿命符合Ｌｏｇｉｓｔｉｃ方程。２４±２℃与２９±２℃相比，前者更有利于子叶出生、真叶寿命增长和培育壮苗。为ｐ＜０．００１显著水平。比较上列各方程中的ｂ值，可以看出，自第１真叶出现开始，在２２～３１℃温度条件下，平均每４．６～４．８天长出１片叶。每长出一片真叶间隔的时间，两品种，即Ｋ３２６与ＮＣ８２，在２４±２℃条件下，平均前者为４．５９天，后者为４．６７天；在２９±２℃条件下，平均前者为４．７５天，后者为４．８５天。试验表明，真叶出生的间隔时间，在２４±２℃条件下比在２９±２℃条件下要稍快（或稍短），两品种分别快０．１６天和０．１８天。但两品种间差异很小，在２４±２℃条件下，两品种相差仅０．０８天；在２９±２℃条件下，两品种相差为０．１天。２．２烟苗各叶位叶的寿命２．２．１子叶寿命表１及图１、图２表明，在本试验温度范围内（２２～３１℃），子叶寿命为２４～２８天，不同?
In 24 ± 2 ℃ and 29 ± 2 ℃ in the greenhouse, 5 to 7 days after sowing cotyledons, cotyledons life of 24 to 28 days. Leaf sequence and true leaf birth date was linearly positive, an average of 4.6 to 4.8 days to grow a new leaf. With the leaf position increased, the true leaf life is gradually extended, the first to the true leaf life of 25 to 36 days, the fourth true leaves increased to 52 days or more. Leaf tobacco leaf position and leaf life in line with Logistic equation. 24 ± 2 ℃ compared with 29 ± 2 ℃, the former is more conducive to cotyledons, true leaf life growth and nurturing seedlings. P <0.001 significant level. Comparing the b values in the above equations, it can be seen that one leaf per 4.6 to 4.8 days grows at an average temperature of 22 to 31 ° C since the appearance of the first true leaf. For each true leaf interval, two varieties, K326 and NC82, averages 4.59 days at 24 ± 2 ° C and 4.67 days at the latter. At 29 ± 2 ° C, The average was 4.75 days for the former and 4.85 days for the latter. Experiments showed that true leaf birth intervals were slightly faster (or slightly shorter) at 24 ± 2 ° C than at 29 ± 2 ° C, with 0.16 and 0.18 days for the two varieties, respectively. However, the difference between the two cultivars was very small. Under the condition of 24 ± 2 ℃, the difference between the two cultivars was only 0.08 days. Under the condition of 29 ± 2 ℃, the difference between the two cultivars was 0.1 day. 2.2 lifespan of leaves leaf position 2.2.1 cotyledon life table 1 and Figure 1, Figure 2 shows that in the test temperature range (22 ~ 31 ℃), cotyledon life of 24 to 28 days, different ?