施用7%草甘膦水剂对土壤盐化和碱化的影响

通过室内盆栽模拟实验,研究了5种浓度的7%草甘膦水剂对土壤盐化和碱化的影响。结果表明,施药后土壤盐度(用电导率表示)、钠碱化度(ESP)、钠吸附比(SAR)、总碱度及pH值都明显增大,且随施药次数的增加,上述各项盐化和碱化指标不断增大;每次施药后,土壤的各项盐化和碱化指标都随施药浓度的升高呈增大趋势。6次施用0.352 g/L的7%草甘膦水剂后,土壤的电导率由施药前的1 010增加为2 460 μS/cm,ESP由2.247％增加为7.983％,SAR由1.576增加为4.305,总碱度由1.443 mmol/L增加为4.485 mmol/L,pH值由6.92变为7.89。虽然土壤各项盐化和碱化指标的变化都还在非盐化和非碱化土范围内,但有盐化和碱化的趋势。

Effect of 7 % Glyphosate Aqueous Solution on Soil Salinize and Alkalize

Potted plant experiment was used in studying the effect of 7% glyphosate aqueous solution at five concentrations on soil salinize and alkalize.The results indicate that after glyphosate was applicated,salinity(expressed by electrical conductivity),exchangeable sodium percentage(ESP),sodium adsorption ratio(SAR),alkalinity and pH of soil increased obviously.With the increasing of the times of glyphosate applicated,all indexes mentioned above increased. With the increasing of the concentration,all indexes increased after glyphosate was applicated every time.After 7% glyphosate aqueous solution at the concentration of 0.352 g/L was applicated six times,electrical conductivity of soil changes from 1 010 μS/cm to 2 460 μS/cm;ESP of soil changes from 2.247％ to 7.983％;SAR of soil changes from 1.576 to 4.305;alkalinity of soil changes from 1.443 mmol/L to 4.485 mmol/L;pH of soil changes from 6.92 to 7.89.Though the changes of all indexes are within the range of nonsaline and nonsodic soils,the soils affected by salt in glyphosate aqueous solution tend to saline-sodic soils.