The adoption of cereal rye (Secale cereale) cover crop has triggered the interest of farmers as an additional tool for pigweed (waterhemp [Amaranthus tuberculatus] and Palmer amaranth [A. palmeri]) management in soybean production systems. Along with interest in this practice, there have been many questions about how cereal rye can impact other weed management practices, such as the fate of PRE-emergence (PRE) herbicides in the soil when applied over high cereal rye biomass

See the study in this PDF (dowloadable): Cereal Rye Cover Crop PreEmergence Herbicide Fate, and Pigweed Residual Control.