Test Weight and Moisture Relationship
Test weight and grain moisture are inversely related, at least in the range of 20% to 30% moisture where most corn is harvested. As corn dries, the kernel shrinks and becomes more dense, and the kernels pack tighter together due to less surface friction. Studies have shown that corn can gain up to 0.25 pounds of test weight for each point of moisture removed. For example, corn at 28% moisture with a test weight of 54 lbs/bu, may have a test weight of 56 lbs/bu when dried to 20% moisture.