One of the indicators that will help you to detect any possible problems with the products storage inside the silos is the change in color and general appearance.

In general, sound soybeans are plump with bright uniform tan and not green color and free from unusual spots and shriveled appearance. Discolored soybeans usually indicate inferior quality and lower market value. The change in color is usually associated with mold invasion accompanied by microbial respiration and subsequent heating. This deterioration process can be detected by periodic drawing of samples from the stored soybeans as part of an integrated approach to quality maintenance.

Change in color is mainly caused by the appearance of mold. The following table shows the minimum % of humidity at which the different molds can develop, as well as the minimum, optimum and maximum temperatures at which they develop. Most of them have an optimum between 25 and 28ºC.

Change in color

If we control temperature and moisture, we will avoid change in color, therefore our product will have a higher market value. 

Preventive measures:

  • Cooling the grain either by aeration or use of a portable cooling unit.
  • To transfer the grain to another silo thus breaking any hot spots present and cooling the soybeans during the conveying process. However, this should be done only as a last resort since it is costly and will increase the amount of broken or split soybeans.

References: Department of Grain Science and Industry, Kansas State University, USA

 

RELATED CONTENT

  1. How to minimize spoilage during the storage of soybeans
  2. Indicators to detect problems with the soybeans stored in a silo: Heating
  3. Indicators to detect problems with the soybeans stored in a silo: Change in color
  4. Indicators to detect problems with the soybeans stored in a silo: Musty odour
  5. Indicators to detect problems with the soybeans stored in a silo: Lumping and caking

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