摘要
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。
The results showed that with successive planting of tobaceo, the available nutrients in soil increased yearly under normal fertilization condition. The contents of P. S were aceumulated obviously, which were unfavourable to the growth of tobacco. Meanwhile, the proportion of available nutrients changed to some extent, especially the ratios of N/P, K/P, K/S decreased sighfeantly. when the proprtion of nutrients became imbalanced, the growth of tobacco would be affected, which resulted in the reduction of yields.
基金
贵州省科学基金
关键词
烤烟
连作
土壤养分
分析
tobacco successive planting soil nutrients analysis
