Harvest · July 2025 · 5 min read
Accurate grain moisture testing determines harvest timing, drying costs, and storage safety. Reliable moisture readings prevent over-drying that wastes energy and shrinks test weight, or under-drying that risks spoilage and rejected loads at the elevator.
Capacitance-based meters are the most common on-farm option, measuring the electrical properties of grain to estimate moisture content. Handheld models are portable for field checks, while combine-mounted sensors provide continuous readings during harvest. Near-infrared (NIR) meters offer higher accuracy and can measure protein and oil content simultaneously but cost significantly more.
Safe storage moisture is 15.5% for corn, 13.0% for soybeans, and 13.5% for wheat when storing through winter. For long-term storage beyond six months, reduce these targets by 1–2 percentage points. Harvesting slightly above target and using aeration or low-temperature drying can improve efficiency compared to waiting for field dry-down that risks late-season weather losses.
Each point of moisture removed from corn costs approximately $0.04–$0.07 per bushel depending on fuel type and dryer efficiency. Calculate your breakeven by comparing drying cost per bushel against the harvest losses and field time gained by harvesting wetter. Factor in the moisture shrink discount at the elevator — typically 1.4% weight reduction per point above target — when deciding whether to dry on-farm or deliver wet.
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