Seed variety field-trial calculator
Compare two crop varieties using actual harvested plot weights, plot sizes, grain moisture and seed costs. Numbers here are an illustration until you enter your own measurements.
Enter trial measurements
Compare only like-for-like plots of the same crop, planted under similar management. Measurements below are for grain crops; adjust standard moisture using the accepted crop-specific value.
Enter conversion weight (lb/bushel); corn uses 56, soybeans 60, wheat generally 60. Verify crop standards before comparison.
Variety A
Variety B
Method and important limitations
Moisture-adjusted weight = harvested weight × (100 − harvested moisture)/(100 − market moisture). Yield in bushels per acre = adjusted weight ÷ standard bushel weight ÷ measured harvested acreage. Seed-cost-adjusted gross return = yield × crop price − seed cost per acre. This is not net profit; it excludes all other production costs, drying charges, test weight effects, shrink beyond simple moisture adjustment and other price adjustments.
A two-plot comparison cannot establish statistical significance. For reliable field research, use multiple randomized replicates, consistent equipment calibration, comparable soil and management, and multiple years or environments where possible. Verify study design with Cooperative Extension.
Additional reading: USDA National Agricultural Statistics Service; Cooperative Extension programs; and Farm.FM agricultural reporting.