To make good silage from summer annuals such as sorghum, sudangrass, and pearl millet, the dry matter concentration should be between about 30% to 40% (moisture contents of 60 to 70%). Silage made wetter can seep which causes a loss of nutrients and potential environmental damage if the seepage gets into surface water (fish kill). Silage made drier will not pack adequately and may heat during storage. In some situations, heat generation can be great enough to start a fire within the silage mass. The drier the silage, the greater the risk for a silo fire.