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以西南地区广泛种植的烤烟品种云烟87为材料,在重庆市彭水县烟区进行大田试验,研究了118.5kg/hm2(处理一,常规施氮水平,作为对照CK)和155.6kg/hm2(处理二)2种氮素水平下,烟株光合、呼吸指标以及烟叶产、质量的变化.结果表明:在移栽后45d和75d时,处理二的烟叶叶绿素质量分数高于处理一;在移栽45d到90d之间,2种施氮量下烟株的净光合速率和气孔导度变化趋势相同,都呈先增加后下降的变化趋势,处理二能增加云烟87在生长后期的净光合速率;2种施氮量下,烟株的蒸腾速率变化趋势不尽相同,在移栽后的各个时间,处理二烟株的蒸腾速率低于处理一;2种施氮处理对云烟87叶片中过氧化物酶和多酚氧化酶活性有影响,在移栽60～75d之间,处理二烟叶叶片的过氧化物酶和多酚氧化酶活性大于处理一;处理二增加上、中、下烟叶烟碱和中、下部烟叶K质量分数,降低烟叶上、中、下各个部位总糖的质量分数,使中部烟叶化学成分更协调;处理一烤烟每667m2的产量和每667m2的产值都高于处理二,而均价、上等烟率和桔色烟率则是处理二高于处理一.
A field experiment was conducted in Yunzhui 87, a flue-cured tobacco variety widely planted in the southwest of China. The effects of 118.5kg / hm2 (treatment one, conventional nitrogen application, CK) and 155.6kg / hm2 The results showed that: At 45d and 75d after transplanting, the chlorophyll content of tobacco leaves in the second treatment was higher than that in the first treatment, while in the second treatment, the photosynthesis, The net photosynthetic rate and stomatal conductance showed the same trend at the two nitrogen application rates for the first 45 days to the 90th days. Both of them showed the trend of first increasing and then decreasing. The second treatment increased the net photosynthetic rate Under the two nitrogen rates, the transpiration rates of tobacco plants varied with different trends. Transpiration rate of two tobacco plants was lower than that of treatment one at each time after transplanting. Oxidase and polyphenol oxidase activity, transplanting between 60 ~ 75d, the treatment of the second leaf of tobacco leaves peroxidase and polyphenol oxidase activity is greater than the treatment of a; two to increase the upper, middle and lower leaf tobacco Base and middle and lower leaves K mass fraction, lower tobacco leaf, middle and lower The mass fraction of total sugar in each part made the chemical constituents in the middle part more coordinated. The output per 667m2 and the output value per 667m2 of one flue-cured tobacco were higher than those in the second part, while the average price, the first-class tobacco percentage and the orange smoke rate were the same Two is higher than dealing with one.