This study investigated the influence of the application amounts of nitrogen on the growth and physiological characteristics of tobacco seedlings by studying flue-cured tobacco K326,the appropriate amount of nitrogen fertilizer needed for tobacco seedlings grown in floating beds was determined. Results showed that applying small amount of nitrogen increased the number of tobacco seedling roots and improved root activity,thus enhancing root adsorption. Moreover,it also significantly increased the activity of resistance-related peroxidase,polyphenol oxidase,and phenylalanine and reinforced the resistance of tobacco seedlings to pathogens. Applying appropriate amount of nitrogen could significantly increase the photosynthetic rate of tobacco seedling leaves,intercellular CO2 content,transpiration rate,and water use efficiency. The amount of nitrogen appropriate in the process of growing tobacco seedlings on a floating bed was 6 ~ 11 mg / plant,this nitrogen concentration was conducive to the growth of healthy tobacco seedlings with strong roots and resistance.
Acta Agriculturae Jiangxi
Growth and development