Simulation of soil water and herbicide migration in sunflower fields based on HYDRUS model
In order to examine the residues of herbicides at different dosages in the soil,field trials were carried out.Using the HYDRUS model,the transport process of soil water content,glyphosate and Haloxyfop-R-methyI (HPME) in sunflower fields in Hetao irrigation area were simulated,and the transport law of glyphosate and HPME at different dosages in soil was explored.The results showed that the residues of glyphosate and HPME were mainly distributed in the 0～5 cm and 5～10 cm soil layers,and residue of the 0～5 cm soil layer was relatively large.The residues of glyphosate and HPME in the 0～5 cm soil layer 7 days after the herbicide were reduced 71.0%～75.8% and 94.7%～94.9%.The residues of glyphosate and HPME in 5～10 cm soil layer 7 days after the herbicide were re-duced by 48.0%～50.0% and 86.2%～89.9%.No glyphosate residues and HPME residues were detected in soil and groundwater 21 days after the herbicide.Based on the simulation results of the HYDRYS model,the simulated values of soil water content,glyphosate and HPME residues were in good consistency with the field measurements,HYDRUS model simulated well the soil water content distribution characteristics and herbicide transport law in sunflower fields.
万方数据
维普
