低肥力土壤施氮对烤烟干物质积累、氮素吸收及产质量的影响

Effects of Nitrogen Application on Dry Matter Accumulation,Nitrogen Uptake,Yield,and Quality of Flue-cured Tobacco in Low Fertilility Soil

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。

A field experiment was conduected to investigate the effects of nitrogen rates on dry matter accumulation, nitrogen uptake, yield and quality of the flue-cured tobacco in low fertility soil. The results showed that accumulation of dry matter and nitrogen, and nitrogen content in roots, stems, and leaves of the tobacco increased with increasing nitrogen rate. The soil inorganic nitrogen content increased and then decreased and kept stable finally. Appllying chemical nitrogen fertilizers could remarkably increase soil inorganic nitrogen content in short term. The yield, average price and output value of the tobacco increased and the chemical compositions bacame more balanced as the nitrogen rate increased if nitrogen rate was less than 105 kg/ha. In conclusion, nitrogen application can remarkably influence the biomass, nitrogen uptake and accumulation of the flue-cured tobacco.