Grain Drying Shrink and Net Bushels
Moisture shrink from wet to market moisture, dried weight, handling shrink.
Example
You enter
- Gross wet weight (lb) 10000
- Wet moisture (%) 20
- Market moisture (%) 15
- Handling shrink (%) 0.5
- Test weight (lb/bu; 56 corn, 60 wheat/soy) 56
You get
- Net market weight 9361.8
- Net market bushels 167.2 bu
- Shrink 6.38
Checked against published worked examples from: National Corn Handbook (Hicks and Cloud, Purdue, Iowa State, Wisconsin reviewers); South Dakota State University Extension.
Details, formula, and sources
ScopeMoisture shrink from wet to market moisture, dried weight, handling shrink, and net market bushels at the crop test weight (56 corn, 60 wheat/soy). The buyer contract and moisture discount schedule govern.
Formula or tablemoist_shrink = (M_wet - M_dry)/(100 - M_dry); W_dry = W (100 - M_wet)/(100 - M_dry); W_net = W_dry - W x handling/100 (handling on the original wet weight, so total shrink = water shrink + handling); bushels = W_net / test_weight; total_shrink = (W - W_net)/W.
Source and editionThe standard grain moisture-shrink relation used by USDA and land-grant extension, by name.
Free accessGrain-shrink formulas are published free by land-grant extension services (e.g. Iowa State, Purdue). The buyer's contract, moisture discount schedule, and certified settlement scale govern.
What governsEstimate. AHJ and licensed professional govern.
API field namesW_lb, M_wet_pct, M_dry_pct, handling, tw_lbbu, W_net_lb, bushels, total_shrink_pct
- Moisture-shrink form (M_wet - M_dry)/(100 - M_dry) with the water-balance dried weightUSDA / land-grant extension
- Bushel weight 56 lb/bu corn, 60 lb/bu wheat and soybeans, 32 lb/bu oats (standard legal bushel weights, not FGIS grade minimums)standard bushel weights; cf. 7 CFR 810
- No dockage no foreign-material or damage dockage and no discount-dollar computationscope of this tile