4. Filling and packing
To prevent spoilage between filling layers, fill bunkers as rapidly and continuously as possible. Stopping for a day or more may result in spoilage layers that can depress feed intake. Pack bunkers continuously during filling to expel air that is trapped between plant particles.
Cover bunkers and tower silos as soon as filling is completed. Plastic covering will prevent exposure of the top silage surface to air and water and control the extent of spoilage in the top layers. Tucking the plastic around bunker sidewalls will prevent water from seeping into the silage which will help prevent sidewall spoilage.
6. Preventing potential leachate problems
Harvesting at 30 to 40% WPDM is the first step in preventing silage seepage. Harvesting at less than 30% WPDM for horizontal silos increases the potential for seepage.
Vertical silos require higher WPDM to prevent leaching. After filling and covering is completed take care to clean up plant material from around the bunker, bags, piles or tower silo. Implement a plan to direct water from the silage bunk area to a properly designed system to prevent possible environmental problems.
Source: Mike Allen, Adam Lock, Dave Beede, Michigan State University Extension