Ideal moisture and packing for corn silage success

By Scout Nelson

For optimal corn silage harvest, aim for 62-68% moisture or around the ¾ milk line stage. However, this range can change depending on storage methods. Stalks and kernels contribute most to moisture levels, so even if fields appear stressed, plants may be wetter than assumed.

Dr. Joe Lauer's study in Wisconsin showed that kernel milkline is not always a reliable indicator of whole-plant moisture due to hybrid variability. Some corn hybrids at 50% milkline showed moisture levels as high as 74%. This variability highlights the importance of testing whole-plant moisture before harvesting.

Once the whole-plant moisture is known, estimate a daily dry down rate of 0.5% to plan the harvest start. Testing methods like the microwave or Koster Tester can help ensure accurate moisture levels.

Packing silage properly in a pile or bunker silo is crucial. Layers should not exceed six inches in depth, and pack density should be above 15 pounds of dry matter per cubic foot. To calculate the pounds needed for effective packing, Covering silage piles immediately after packing with an oxygen barrier tarp can significantly reduce spoilage.

Studies from Michigan State University and Kansas State University found a 7.8:1 return on investment for using tarps to cover silage, saving thousands in feed losses.

By following these steps, farmers can preserve their silage quality, maximize their investment, and reduce spoilage losses.

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