Different Pollution Condition Of Tobacco Plant Of Heavy Metals Distribution Rule And The Absorption Of Previous Crops Influence Of Research

The absorption and distribution of main heavy metals in tobacco plant under different pollution ways were studied in this research, and the mechanism was also discussed. The effect on the contents of heavy metal in flue-cured tobacco between different preceding crops was also studied in this passage. The main results of this research are as follows:1.The content of Arsenic in organization of tobacco plants was performed for Soil irrigation> Spraying on the leaf(under the same concentration of pollution), and in the Soil irrigation, the content increased along with the increasing of the concentration of Arsenic pollution. The content of Arsenic in different parts of tobacco plants was performed for root>interveinal organization> leaf vein> stem. The content of Arsenic in vein was lower than that in interveinal organization in tobacco leaves, and the content increased slightly with the position reducing, but the trend was not obvious in leaf interveinal organization. The Arsenic absorption of tobacco was performed for Soil irrigation> Spraying on the leaf(under the same concentration of pollution), the content during different parts of tobacco showed the highest in root and lowest in stem. With the position reducing in leaf vein and interveinal organization, the content increased. The distribution proportion of Arsenic in different parts of tobacco plants was performed for interveinal organization> leaf vein>root> stem, and in the Soil irrigation, the distribution proportion increased along with the increasing of the concentration of Arsenic pollution.2. The content of Mercury in organization of tobacco plants was performed for Spraying on the leaf>Soil irrigation (under the same concentration of pollution), and in the Soil irrigation, the content increased along with the increasing of the concentration of Mercury pollution. The content of Mercury in different parts of tobacco plants was performed for root> interveinal organization> leaf vein> stem. The content of Mercury in vein was lower than interveinal organization in tobacco leaves, and the content increased with the position reducing. The Mercury absorption of tobacco was performed for Soil irrigation> Spraying on the leaf(under the same concentration of pollution), the content during different parts of tobacco showed the highest in root. The distribution proportion of Mercury in different parts of tobacco plants was performed for interveinal organization> plant blade> leaf vein. The distribution proportion increased with the position reducing. In the low concentration of Soil irrigation, the distribution proportion during each part of veins showed that high in upper and lower parts while low in central parts.3. The content of Lead in organization of tobacco plants was performed for Spraying on the leaf>Soil irrigation (under the same concentration of pollution), and in the Soil irrigation, the content increased along with the increasing of the concentration of Lead pollution. The content of Lead in different parts of tobacco plants was performed for forinterveinal organization> root> leaf vein> stem. The Lead absorption of tobacco was performed for Soil irrigation> Spraying on the leaf(under the same concentration of pollution), the content during different parts of tobacco showed the highest in root but the trend was not obvious along with the increasing of he concentration of Lead pollution. The content was highest in forinterveinal organization while lower in root during Spraying on the leaf. The Lead absorption reduced with the position reducing during Soil irrigation. The distribution proportion of Lead in different parts of tobacco plants was performed increasing with the position reducing. But in Soil irrigation, the distribution proportion showed that high in upper and lower parts while low in central parts.4. The content of Cadmium in organization of tobacco plants was performed for Soil irrigation> Spraying on the leaf (under the same concentration of pollution), and in the Soil irrigation, the content increased along with the increasing of the concentration of Cadmium pollution. The content of Lead in different parts of tobacco plants was performed for highest in forinterveinal organization while lowest in root and stem. The Cadmium absorption of tobacco was performed for Soil irrigation> Spraying on the leaf(under the same concentration of pollution), the content during different parts of tobacco showed the highest in forinterveinal organization. With the position reducing in leaf, the content increased. The distribution proportion of Cadmium in different parts of tobacco plants was performed increasing with the position reducing in Soil irrigation, while reducing with the position reducing in orinterveinal organization during Spraying on the leaf.5. The effect on the contents of heavy metal in flue-cured tobacco between different preceding crops was performed that when the preceding crop was radish, the contents of heavy metal arsenic, mercury, lead, cadmium were slightly increased than idle processing while the content of chromium was reduced. When the preceding crop was wheat, the contents of heavy metal arsenic, lead, and cadmium were reduced than idle processing while the content of mercury and chromium were increased in upper and lower leaves and reduced in central leaves. When the preceding crop was barley, the content of cadmium was all increased and chromium was slightly increased, while the contents of heavy metal arsenic, mercury, lead were performed for low in upper and lower parts while high in central parts. When the preceding crop was green manure, the contents of heavy metal arsenic, mercury, lead, cadmium and chromium were all reduced than idle processing.