论文部分内容阅读
为了科学、安全地使用百菌清、腈菌唑防治香蕉病害,采用气相色谱法及田间试验方法研究百菌清、腈菌唑在香蕉上的残留消解动态。结果表明,百菌清在香蕉上的原始沉积量大于腈菌唑,同一农药的原始沉积量与施用量密切相关。百菌清施药后14 d内的消解率大于腈菌唑,而14～21 d的消解率与腈菌唑接近。百菌清、腈菌唑在香蕉上的残留消解规律符合一级动力学关系,相关系数|r|=0.942 8～0.998 0(P<0.1)。百菌清的消解速度较快,消解系数|κ|=0.220 45±0.009 15,半衰期(T_(1/2))为3.1～3.3 d,消解99%所需要的时间(T_(0.99))为20.1～21.7 d;腈菌唑的消解速度缓慢,|κ|=0.170 3±0.000 1,T_(1/2)为4.1 d,T_(0.99)为27.1 d。距第2次(末次)施药后55～68d,在香蕉产品上均未检出百菌清、腈菌唑残留。
In order to scientifically and safely use chlorothalonil and myclobutanil to prevent and cure banana diseases, the residual digestion dynamics of chlorothalonil and myclobutanil on banana were studied by gas chromatography and field experiments. The results showed that the initial deposition of chlorothalonil on banana was greater than that of myclobutanil. The original deposition of the same pesticide was closely related to the application rate. Chlorothalonil application within 14 days after the digestion rate greater than myclobutanil, and 14 ~ 21d digestion rate and myclobutanil close. Residues of chlorothalonil and myclobutanil on banana accorded with the first order kinetics, the correlation coefficient | r | = 0.942 8 ~ 0.998 0 (P <0.1). The digestion coefficient | κ | = 0.220 45 ± 0.009 15, the half-life (T 1/2) was 3.1-3.3 d, and the time required for 99% digestion (T 0.99) was 20.1 ~ 21.7 d. The dissolution rate of myclobutanil was slow, | κ | = 0.170 3 ± 0.000 1, T 1/2 (1/2) was 4.1 d, T 0.99 was 27.1 d. From the second (last time) application 55 ~ 68d after the banana products were not detected chlorothalonil, myclobutanil residues.