Minnesota is taking steps to safeguard its groundwater. The state's Agriculture Department (MDA) is advising farmers and commercial applicators about some restrictions. Specifically, certain parts of the state have a ban on fall nitrogen fertilizer use. This rule, named the Groundwater Protection Rule, is all about preventing environmental issues.
It especially focuses on places with certain soil types or karst geology that can be harmed the most by nitrate loss and groundwater contamination.
Every year, starting on September 1, these guidelines kick in. But how can farmers know if their fields fall under this rule? There's an online map showing these special areas, which can be found here.
For the rest of the state, fall nitrogen fertilizer isn't off the table. The MDA simply suggests waiting a bit. Because cooler soil is better for these applications.
If farmers wait until the average soil temperature goes down to 50 degrees F or less, it helps keep nitrogen safe. This not only protects the environment but also means more nitrogen stays for crops next season.
For those wondering about soil temperatures, the MDA is one step ahead. They've set up a system that shows real-time soil temperatures in 25 different locations in the state. There are also links to other research stations that track soil temperatures. All these can be seen on their interactive map.
This isn't just about fertilizers. Those looking to apply manure in fall should also pay attention to the same temperature guidelines. It's a win-win for both the environment and farmers.
Photo Credit: istock-cactusoup
Categories: Minnesota, Crops