Evaluation of Available Micronutrient Contents in Tobacco Planting Soils in Bijie

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.