氮素形态和数量对烤烟干物质积累及钾含量与积累量的影响

Effects of Nitrogen Form and Concentration on Flue-cured Tobacco Dry Matter Accumulation and Potassium Content and Accumulation

水培条件下,于烤烟打顶后改变营养液中铵硝配比(NH+4 -N/NO- 3-N)和氮素浓度,对烤烟体内干物质积累量及根、茎、叶的钾含量和积累量进行研究。结果表明,水培条件下,铵硝配比0∶10 ,氮素浓度14 0mg/L时烤烟干物质积累量达到最大。烤烟叶片和茎中钾含量在铵硝配比为0∶10 ,氮素浓度35mg/L时达到最大,钾积累量在铵硝配比0∶10 ,氮素浓度14 0mg/L时最大。而烤烟根中钾含量和积累量在铵硝配比5∶5 ,氮素浓度70mg/L时最大。不同处理烤烟不同部位钾含量和积累量的变化规律均表现为叶>茎>

In hydroponics test the flue cured tobacco dry matter accumulation and potassium content and accumulation in root, stem and leaf were studied when changing the rations of NH + 4/NO - 3 and nitrogen concentration in nutrient solution after topping.The results showed that flue cured tobacco dry matter accumulation raised to the maximum when the ration of NH + 4/NO - 3 was 0∶10 and nitrogen concentration was 140 mg/L. Potassium in leaf and stem raised to the maximum when the ration of NH + 4/NO - 3 was 0∶10 and nitrogen concentration was 35 mg/L.Potassium accumulation in leaf and stem raised to the maximum when the ration of NH + 4/NO - 3 was 0∶10 and nitrogen concentration was 140 mg/L. Potassium content and accumulation in root raised to the maximum when the ration of NH + 4/NO - 3 was 5∶5 and nitrogen concentration was 70m g/L. In different treatments, change of potassium content and accumulation in different parts of tobacco was according to the following sequence∶leaf>stem>root.