在种植前用杀菌剂和杀虫剂对甘蔗种子进行化学处理,可以提高多年生甘蔗和糖的产量,每年收获的作物。然而,应用的化学品的命运是未知的。因此,这项研究的目的是测量路易斯安那州矿物甘蔗土壤中选定的方坯种子处理化学品的需氧耗散。表面15厘米的土壤样品用噻虫嗪处理,唑霉素,fluxapyroxad,丙环唑,或吡唑酯,并在实验室条件下监测超过100天。通过高效液相色谱法测定杀虫剂和杀真菌剂水平。耗散数据拟合到四个动力学模型:简单一阶(SFO),一阶多隔间(FOMC),双一阶并行(DFOP),和曲棍球棒(HS)。噻虫嗪的耗散半衰期(DT50),唑霉素,fluxapyroxad,丙环唑,或吡唑醇酯分别为275、100、144、74和39d,分别。总的来说,研究中农药的DT50表明,在实验条件下,土壤中的中长期持久性。这是其中几种与甘蔗种植土壤中有氧消散有关的农药的第一份报告。
Chemical treatment of sugarcane seed with fungicides and insecticides prior to planting increases yields of cane and sugar for the perennial, annually harvested crop. However, the fate of the applied chemicals is unknown. Therefore, the purpose of this study was to measure the aerobic dissipation of selected billet seed treatment chemicals in a mineral sugarcane soil from Louisiana. Soil samples from the surface 15 cm were treated with either thiamethoxam, azoxystrobin, fluxapyroxad, propiconazole, or pyraclostrobin and monitored over 100 days under laboratory conditions. Insecticide and fungicide levels were determined by high performance liquid chromatography. Dissipation data were fitted to four kinetic models: simple first-order (SFO), first order multi-compartment (FOMC), double-first order in parallel (DFOP), and hockey-stick (HS). The dissipation half-life (DT50) of thiamethoxam, azoxystrobin, fluxapyroxad, propiconazole, or pyraclostrobin were 275, 100, 144, 74, and 39 d, respectively. Overall, the DT50 for the pesticides in the study indicated medium to long persistence in soil under the conditions of the experiment. This is the first report for several of these pesticides related to the aerobic dissipation in soils used to grow sugarcane.