The relation between the moisture content and the test weight of corn
1937
Miles, S.R.
Sixteen lots of five varieties of corn were tested daily while drying in a warm room to determine the relation between the weight per measured bushel and the percentage of water. The relation was somewhat different for Krug and the other four varieties. The association was negative in the range from 10 to about 30% water. In the range from 14% to 22% water, the association was practically linear, and for each change of 1% in the water Krug changed 0.59 pound and the average change of the other four varieties was 0.48 pound per bushel. The detailed results permit adjustments to improve comparisons of test weights of lots of corn with different moisture contents. It is best for the corn to contain less than 15 (or 20%) water when tested and there is little to gain from making comparisons between lots with over 25% water. Because the errors of adjustment increase with the moisture differences, it is desirable to have the moisture range as small as possible for the lots of corn to be compared. In addition, it is best to make all adjustments to the average percentage moisture of the lots. When water was added to corn the changes in test weight associated with changes in water content were much greater than when corn was drying. The standard deviation of individual determinations of test weight in corn was found to be 0.243 pound. For significance with this standard deviation, individual test weights must differ by 0.6 pound and means of five determinations by 0.25 pound.
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