The effect of applying different amounts of nitrogen to tobacco seedlings on their growth and physiological characteristics
Year: 2017
Type: article
Abstract: In this study, we sought to elucidate how under-and over-application of fertilizers, which results often from erroneous calculation of the amount of fertilizer applied, affects tobacco seedling growth.Specifically, the effect of application of different amounts of nitrogen on the growth and physiological characteristics of seedlings of flue-cured tobacco K326 was investigated.Nitrogen treatment was done at four levels: 6 mg/plant (T 1 ), 11 mg/plant (T 2 ), 16 mg/plant (T 3 ), and 21 mg/plant (T 4 ).The root activity, enzyme activity, chlorophyll, photosynthetic performance, and root morphology were measured at 39, 45, 51, 57, and 63 days after seeding.Root activity exhibited a declining trend with increase in the amount of nitrogen applied at the late growth stage of tobacco seeding.Root activity decreased from 115.24 μg g -1 h -1 (T 1 ) to 109.65 μg g -1 h -1 (T 2 ), then to 85.07 μg g -1 h -1 (T 3 ), and finally to 76.86 μg g -1 h -1 (T 4 ) at 63 days after seeding.Moreover, nitrogen application also significantly increased the activity of resistance-related peroxidase, polyphenol oxidase, and phenylalanine, and enhanced the resistance of tobacco seedlings to pathogens.Applying the appropriate amount of nitrogen (6-11 mg/plant) could significantly increase the photosynthetic rate of tobacco seedling leaves, intercellular CO 2 content, transpiration rate, and water use efficiency.The amount of nitrogen most suitable for growth of tobacco seedlings with strong roots and resistance on a floating bed was 6-11 mg/plant.
Authors: Jiang Houlong, Tian Fengjin, Wang Daibin, Xu Chen, Li Najia, Wang Hongfeng, Yang Chao, Chen Yiyin
Institution: China Tobacco
Language: English
Subfield: Plant Science
Domain: Life Sciences
SDG: Zero hunger
Open Access status: bronze
OpenAlex ID: W2591789688