不同环境因子及施药量对土壤中唑菌酯残留的影响

EFFECT OF DIFFERENT ENVIRONMENTAL FACTORS AND FUNGICIDE DOSAGE ON THE RESIDUAL OF SYP-3343

在实验室条件下研究了土壤pH、温度、含水量及施药量对新型杀菌剂唑菌酯(E-2-(2-((3-(4-氯苯基)-1-甲基-1H-吡唑-5-基氧)甲基)苯基)-3-甲氧基丙烯酸甲酯)在土壤中残留量的影响。结果表明,在25d的培养时间内,随土壤含水量的增加,唑菌酯在土壤中的残留量减少;土壤含水量增加到60%田间最大持水量时,其残留达最低,为1.81μg/g,而在淹水环境中其残留量增加。随着土壤温度的升高,唑菌酯的残留呈现先降低后升高的趋势,4℃时的残留达最大(3.86μg/g)。土壤pH对其在土壤中的残留具有明显影响,在中性和弱碱性土壤中均具有相对较低的残留。在1～10μg/g施药量时,唑菌酯在土壤中的残留比例随其施药量的增加而少量降低,在药剂浓度为20μg/g时,土壤中唑菌酯的残留率为42.4%。

The present study investigated soil residue of a novel fungicide SYP-3343 [（ E ）-2-2-（ 3-（（ 3-（4- chlorophenyl） -1 -methyl-1 H-pyrazol-5-yloxy） methyl） phenyl） -3-methoxyacrylate ] under different laboratory incubation conditions, such as soil pH, temperature, water content and fungicide dosage. Results showed that SYP-3343 decreased with the increasing of soil water content and the lowest residue was 1.81μg/g at 60% of water holding capacity. However, the residual was increased in flooded soil. Further experimental results proved that the residual decreased with the soil temperature enhancing, the largest residual was 3.86p, g/g at 4℃ , and the residual was increased when the temperature was exceeding 20℃. Soil pH could affect the residual significantly, neutral and weak base soils showed relatively lower residual. The residual rate had a slight decrease with the fungicide dosage from 1 to 10μg/g, the residual rate was 42.4% when the application dosage of SYP-3343 reached to 20μg/g.