Corn - Chapter 17 | Official Grain Grading Guide

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. When the Terms of Delivery or terms of a contract state that dockage can be deducted then 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.

This table is used to predict the test weight of well-matured corn before drying.
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.

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.