Study on Response of Different Tobacco Genotypes to Nitrogen Nutrition

The water culture pot experiment was conducted to study the effect of nitrogen nutrition on the seedling growth of different tobacco genotypes.The results showed that there was significant difference in the response of different tobacco genotypes to nitrogen concentration.The nitrate reductase (NR) activity,chlorophyll concentration and nitrogen content of tobacco leaf and total absorption area of tobacco rhizotaxy were significantly or extremely significantly correlated with nitrogen concentration.NR activity of tobacco genotypes 8136 and Hongda as well as chlorophyll concentration,nitrogen content were higher than those of other tobacco genotype,but their biomass was reduced with increase of nitrogen concentration;Cultivars KY17 and Zhongyan 90 were opposite from the above.