Herbicidally active thiocarbamates are employed in combination with certain mono-, di- or trihaloalkylphosphonodithioates, the latter in sufficient quantity to lessen the rate of soil degradation of the former. As a result, the herbicidal effectiveness of the thiocarbamate is significantly enhanced and prolonged, rendering a single application or multiple applications of the herbicide effective over a longer period of time. Such herbicidal compositions can optionally contain a non-phytotoxic antidotally effective amount of an amide of haloalkanoic or dihaloalkanoic acid. Also novel compounds trichloro- and bromodichloro- methylphosphonodithioates and the process for their preparation are disclosed.
具有除草活性的
硫代
氨基甲酸酯与某些单、二或三卤代
磷酸二
硫酯结合使用,后者的数量足以减缓前者的土壤降解速度。因此,
硫代
氨基甲酸酯的除草效果显著提高并延长,使
除草剂的单次或多次应用在更长的时间内有效。这种除草组合物可以选择性地含有一种非植物毒性的抗毒性有效量的卤代酸酰胺。此外,还披露了新型化合物三
氯甲基-和
溴二
氯甲基磷酸二
硫酯及其制备方法。