不同施镁水平对烤烟干物质积累及烟碱含量的影响

目的]研究不同施镁水平对烟草生育期干物质积累及烟碱含量的影响。方法]试验共设4个处理：不施镁肥（对照）;低镁处理（150kg/hm2）;中镁处理（300kg/hm2）;高镁处理（450kg/hm2）,其中镁用量为MgSO4.7H2O肥料量。结果]不同生育期烟草叶片内镁含量均随着施镁量的增加而提高。在旺长期和成熟期,随着施镁量增加,叶片积累的干物质量越多。随着施镁水平的增加,烟叶中烟碱含量逐步下降,其中对下部叶片烟碱含量影响较小,对中部叶片烟碱影响居中,对上部叶片烟碱影响最大。结论]该研究为烟叶生产上合理施肥、改善烟株营养状况、提高烟叶的产量和品质提供了科学依据。

Effects of Different Mg Fertilizer Levels on Dry Matter Accumulation and Nicotine Content of Flue-cured Tobacco

Objective]The research aimed to study the effects of different Mg fertilizer levels on dry matter accumulation and nicotine content of flue-cured tobacco.Method]Four treatments were designed,no Mg fertilizer treatment,the low Mg fertilizer treatment,the middle Mg fertilizer treatment and the high Mg fertilizer treatment,and the Mg fertilizer amount was 0,150,300,450 kg/hm~2 respectively.Thereinto,the Mg fertilizer was MgSO_4·7H_2O.Result]The Mg content of flue-cured tobacco leaf at different growth stages increased with the Mg fertilizer amount increasing.With the Mg fertilizer amount increasing,the dry matter accumulation amount of flue-cured tobacco leaf were more at the strongly growing stage and the mature stage,but nicotine content of flue-cured tobacco leaf decreased gradually.Mg fertilizer level had relatively less affected on the lower leaves,the middle affected on the middle leaves and the biggest affected on the upper leaves.Conclusion]The study can provide the scientific basis for reasonably applying fertilizer in tabocco leaf production,impoving the nutrition status of tobacco plant,raising the yield ang quality of tobacco leaf.