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在低肥力地块上,通过田间试验研究了不同氮肥用量对烤烟干物质积累、氮素吸收及产质量的影响。结果表明,增加施氮量可提高烟株干物质积累量、氮素积累量和根、茎、叶的氮素含量;土壤中无机氮含量变化可分为前期增加、中期降低和后期相对稳定3个阶段,增施化学氮肥可以短期内明显增加植烟土壤中无机氮含量。在0～105kg/hm2施氮范围内,随施氮量增加,烟叶产量、均价、产值增加,烟叶化学成分趋于协调。施氮对烤烟生物产量、氮素吸收积累和烟叶产质量有明显的影响。
In low-fertility plots, field experiments were conducted to study the effects of different nitrogen rates on dry matter accumulation, nitrogen uptake and yield and quality of flue-cured tobacco. The results showed that increasing the amount of nitrogen fertilizer could increase the dry matter accumulation, nitrogen accumulation and the nitrogen content in roots, stems and leaves of tobacco plants. The content of inorganic nitrogen in soil could be increased in the early period, decreased in the middle period and relatively stable in the later period In this phase, the application of chemical nitrogen could significantly increase the content of inorganic nitrogen in tobacco in the short term. Within the range of 0 ~ 105kg / hm2 nitrogen application, with the increase of nitrogen application rate, the yield, average price and output value increased, and the chemical components of tobacco leaf tended to be coordinated. Nitrogen fertilizer had significant effects on the yield, nitrogen uptake and accumulation of tobacco and the yield and quality of tobacco.