To minimize the loss of nitrogen (N) from fall-applied anhydrous ammonia (AA), follow these four best practices as defined by Purdue University: seal the application slot, avoid applications on poorly-drained or excessively well-drained soils, wait till soil temperatures approach freezing, and use a nitrification inhibitor.

Here are six key management practices and five key timings to improve control of herbicide-resistant weeds this year.