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通过对贵州绥阳、开阳等烟区不同种植年限的烟地进行调查和采样分析，探索连作烟地土壤养分变化趋势与对策。结果表明，正常施肥条件连作烤烟后土壤全氮、全磷和缓效钾的含量变化不大，而土壤有效养分出现不同程度的积累，其增加的顺序为Ｐ、Ｓ＞Ｋ、Ｍｇ＞ｃａ、Ｎ；长期连栽后，烟地Ｐ、Ｓ明显富积，对烟株生长产生一定的影响。烤烟连续种植后．土壤有效养分的比例也发生一定的变化，特别是Ｎ／Ｐ，Ｋ／Ｐ，Ｋ／Ｓ，Ｃａ／Ｍｇ比值明显下降，若养分比例变化过大，引起养分比例失调，影响烟株的正常生长，则造成烤烟明显减产。合理的轮作能减缓烟地养分的失调，测土平衡施肥可以调整养分比例。
Through the investigation and sampling analysis of the tobacco growing areas with different planting years in Suiyang, Kaiyang and other tobacco growing areas in Guizhou, the trend and countermeasures of the changes of soil nutrients in continuous cropping tobacco were explored. The results showed that the content of soil total N, total phosphorus and slow-acting potassium did not change much under the normal fertilization conditions, while the effective nutrients accumulated at different levels in the order of P, S> K, Mg> Ca, N After a long period of continuous planting, P and S in the tobacco land were obviously enriched, which had a certain impact on the tobacco plant growth. Flue-cured tobacco after continuous planting. The proportion of soil available nutrients also changed, especially the ratio of N / P, K / P, K / S and Ca / Mg decreased obviously. If the proportion of nutrients was too large, , Then the flue-cured tobacco will be significantly reduced. Reasonable rotation can reduce the imbalance of tobacco nutrients, soil testing and fertilization can adjust the proportion of nutrients.