Available micronutrient contents, including Cu, Zn, Fe, Mn, B and Mo, in 298 tobacco-grown soil samples of Bijie area were tested and evaluated. The results indicated that soil available Cu, Fe and Mn were extremely rich and available Zn was rich in Bijie, however, more than 50% and 40% of tobacco-grown soils were deficient in available B and Mo, respectively. There was a significantly negative correlation between the content of available Zn, Fe and Mn and the pH in the soil, while there was negative correlation between available Mo and pH. Moreover, there was a positive correlation between the available Zn, Fe, Mn and B content and the organic matter content. As a whole, B and Mo fertilizers should be added, and the amount of Cu, Zn, Fe and Mn should be controlled for tobacco production in case of heavy metal contamination in Bijie.%对毕节地区298个植烟土壤样品的有效态微量元素Cu、Zn、Fe、Mn、B和Mo的含量及丰缺特性进行了分析,以期为毕节烟区平衡施肥及提高烟叶品质提供依据.试验结果表明,毕节地区植烟土壤中有效态Cu、Fe、Mn含量极丰富,Zn含量丰富,有效硼和有效钼的含量比较缺乏,超过1/2的土壤缺硼,超过2/5的土壤缺钼.土壤中有效态Zn、Fe和Mn的含量与pH呈显著性负相关,有效钼含量与pH呈显著性正相关.土壤中有效Fe、Zn、Mn和B的含量与有机质含量呈显著性正相关.综上所述,毕节烟区要适当补充B肥和Mo肥,对Cu、Zn、Fe和Mn等元素要通过控制施入量或土壤改良来降低其有效含量,防止土壤重金属污染.
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