www.manureadvisorysystem.wi.gov. An online, color-coded map (no, they didn’t use the color brown) will alert Wisconsin farmers to conditions and days that are good or bad for spreading manure, so it doesn’t wash off fields into waterways.Manure is a valuable commodity; a farmer doesn't wanted it washing off the fields. Equally importantly, nobody wants it getting into the streams and lakes, where the huge organic content promotes algal blooms. The link is for Wisconsin, but your state probably provides a similar service.
The latest map Thursday showed most of the soil across Wisconsin is still frozen this winter. That limits the ability of any manure that’s spread to infiltrate the ground. The map also cautioned farmers across most of south-central Wisconsin and Dane County against spreading manure over the next 10 days, citing a high risk of melting snow.
Our house is just a couple hundred yards from the nearest corn/soybean field. My wife and I can always tell when the farmer is manuring the fields. Frankly, it's not an unpleasant odor, but we both have farm backgrounds.
Photo credit: Steve Apps, Wisconsin State Journal.