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SE ND | http://www.ag.ndsu.nodak.edu/abeng/postharvest.htm
Grain test weight is expected to increase as the grain dries. The amount of the increase in test weight will vary depending primarily on the amount of kernel damage and the gentleness of the drying process. Normally the increase is about 0.25 to 0.33 pound per bushel per point of moisture removed when drying combine harvested corn in a high temperature dryer. Therefore, the test weight should increase about 2.5 to 3.3 pounds per bushel when drying corn 10 percentage points. In the research, they measured a 2.8% increase in test weight when there was mechanical damage of 15% and an initial moisture content of 26%. Corn harvested at moisture contents of 25% to 30% typically will have higher mechanical damage. A larger test weight increase may be expected with more gentle drying obtained with some of the newer high temperature dryers and with natural air or low temperature drying. No or little increase in test weight may occur if the corn is immature, has light test weight, has high harvest mechanical damage, or is dried and cooled rapidly using a high drying temperature.
In 2008, little or no increase in test weight occurred during drying. Likely this was due to corn being harvested at high moisture contents, which resulted in higher mechanical damage to the corn, and being dried at high temperatures.
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test weight of corn
