海泡石及钙镁磷肥对烟草主要农艺性状及吸收镉的影响

采用田间小区试验,研究海泡石和钙镁磷肥在400、800 g/m2处理水平下对烟田土壤有效态Cd含量、土壤pH值、烟草Cd含量及主要农艺性状的影响。结果表明,在本试验条件下,海泡石和钙镁磷肥均能有效降低烟田土壤中有效态Cd含量,减少土壤Cd向烟草各组织的迁移转运,2种材料的效果差异不显著;施用海泡石和钙镁磷肥均能小幅度提高土壤pH值,但不能过量施用;400 g/m2钙镁磷肥处理能提高烟叶鲜重,800 g/m2钙镁磷肥和海泡石处理对烟叶鲜重、株高、有效叶数均无显著影响。

Effects of sepiolite and calcium magnesium phosphate fertilizer on agronomic character and cadmium uptake of tobacco

A field experiment was conducted to study the effect of sepiolite and calcium magnesium phosphate fertilizer at application levels of 400 and 800 g/m2 on available Cd content in tobacco planting soil,soil pH value,Cd contents in tobacco and agronomic characters of tobacco.Both sepiolite and calcium magnesium phosphate proved to reduce available Cd content in soil and Cd uptake by tobacco,and the reduction effects was improved with increasing application levels of the 2 materials.However,there was no significant difference in reduction effect between sepiolite and calcium magnesium phosphate fertilizer.At the same time,the 2 materials resulted in increasing soil pH value.Decrease in available Cd in soil and in Cd uptake by tobacco could be partially attributed to the increase in soil pH value,but the 2 materials could not be applied excessively because an appropriate soil pH value was necessary for the growth of tobacco.At the application level of 400 g/m2,calcium magnesium phosphate fertilizer increased fresh weight of tobacco leaf.In application level of 800 g/m2,sepiolite and calcium magnesium phosphate fertilizer showed no significant effect on fresh weight,plant height and effective leaf number of tobacco.