Corn – Chapter 17
Official Grain Grading Guide

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Estimating test weight of well-matured corn after drying

Note: Test weight is determined on corn prior to removal of cracked corn and foreign material. At country elevators in eastern Canada test weight is determined after the removal of dockage.

Corn samples that contain a high percentage of moisture typically show an increase in test weight after drying. Use the following table to predict the test weight of well-matured corn before drying.

▲ Important: This is only a guide, and works only with well matured corn. Samples should be checked yearly to ensure that the forumla applies for that crop condition.

Moisture range	Amount to add
	kg/hl	g/0.5 L
15.8 - 16.4	0.5	2.6
16.5 - 16.9	1.0	5.2
17.0 - 17.3	2.0	10.5
17.4 - 17.6	2.1	11.0
17.7 - 17.9	2.2	11.5
18.0 - 18.3	2.3	12.0
18.4 - 18.6	2.4	12.5
18.7 - 18.9	2.5	13.0

1. Find the moisture range for the test weight of the sample.
2. Add the amount for that moisture range in the appropriate units, either kg/hl or g/l.

▲ Important: Corn samples are not to be downgraded on the basis of an “estimated” test weight. Questionable samples must be dried by exposure and then have the test weight determined.

For example,

The moisture for the tested sample is 17.5%, and the test weight is in kg/hl.

Moisture range	Amount to add
	kg/hl	g/0.5 L
17.4 - 17.6	2.1	11.0

Add 2.1 to the test weight in kg/hl.

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