追施不同浓度锌对烟叶吸收砷铅镉的影响

为探索烤烟大田生育期抑制土壤重金属吸收的有效途径,选取含重金属较高的旱地红壤进行追施不同浓度硫酸锌的大田试验。研究结果表明,追施硫酸锌对烟叶吸收重金属砷和铅的影响很小,但对烟叶吸收镉有明显的抑制作用,而且追施硫酸锌浓度在6 g/L以上,上部叶镉含量可降低50%以上,中下部叶镉含量可降低40%以上。追施硫酸锌浓度超过12 g/L将引起烟叶硫酸锌含量大幅度升高,进而导致烟株锌中毒,并且烟株生长受到严重影响。

Influence of Topdressing Different Concentrations of Zinc on Tobacco Leaves Absorption of As, Pb, Cd

In order to explore effective ways to inhibit absorption of soil heavy metals in flue-cured tobacco growing period in the field, field experiment of topdressing different concentrations of zinc sulfate was carried out in tobacco fields of the dry red soil. The results showed that topdressing of different concentrations of zinc sulfate had very small effect on tobacco leaves absorption of arsenic and lead, but exhibited obviously inhibition on tobacco leaves absorption of cadmium, topdressing zinc sulfate concentration more than 6 g/L could reduce cadmium content by 50% in upper tobacco leaves and by 40% in middle and lower tobacco leaves. If topdressing zinc sulfate concentration was more than 12 g/L, the zinc content of tobacco leaves might increase greatly and led to zinc poisoning as well as serious impact on growth of tobacco plant.