Harvest · July 2025 · 5 min read
Silage quality is largely determined by harvest timing and processing settings. Chopping at the right moisture with proper kernel processing and chop length sets the stage for excellent fermentation and maximum feed value for your livestock.
Whole-plant corn silage should be harvested at 63–68% moisture for bunker silos and drive-over piles, or 60–65% for upright silos and bags. Use the milk line as a visual guide — harvest when the milk line is between one-half and two-thirds down the kernel. Grab samples and use a Koster tester or microwave to verify moisture before committing to full-scale harvest.
Set theoretical length of cut to 3/8 to 3/4 inch depending on moisture and fiber content. Kernel processing rolls should be set at 1–3 mm clearance to crack every kernel — unprocessed kernels pass through the animal and represent wasted feed energy. Check kernel processing score by spreading a 32-ounce sample in a pan and counting whole or half kernels, targeting fewer than two per sample.
Pack bunker silos aggressively in thin 6-inch layers using heavy tractors to achieve a minimum density of 15 pounds of dry matter per cubic foot. Seal immediately with oxygen-barrier film topped by standard plastic and weighted with tires or gravel bags. Every hour a silo remains uncovered allows aerobic spoilage organisms to consume dry matter and reduce feed quality.
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