The present invention relates to uracilpyridines of formula (I), or their agriculturally acceptable salts, wherein the variables are defined according to the description, process for preparation their use as herbicides, i.e. for controlling harmful plants, and also a method for controlling unwanted vegetation which comprises allowing a herbicidal effective amount of at least one uracilpyridine of formula (I) to act on plants, their seed and/or their habitat.