Skip to main content
Iowa State University | Extension and Outreach
Agriculture & Environment
Pesticide Applicator Training Manuals
Families & Health
Home and Family
Food, Nutrition and Health
Strengthening Families Program
Planning and Zoning
Yard & Garden
Lawn, Shrubs, Trees
Vegetables and Herbs
Civic Engagement and Leadership
Communication and Arts
New & Revised
MidWest Plan Service
View All Topics
Remaining Time: 1:59:59
Your shopping cart will expire in
Redirecting to the homepage...
Extending your session...
An error has occurred,
redirecting to the homepage...
A look at how to maintain stored grain in good, quality condition, we’ll see how three different conditions interact to cause grain spoilage problems. This grain module is brought to you by the
Iowa Grain Quality Initiative
and was produced by the former Crop Adviser Institute.
Click here to access the Aeration Module
Understand the function of aeration in preventing grain spoilage. Learn to establish a grain quality monitoring system with frequent temperature checks to prevent spoilage.
In order to maintain grain in good quality condition, it’s important to avoid storage problems. There are three areas to focus on: moisture, temperature, and time. Holding grain that is too wet, too warm, or for too long can cause problems. This module explains how those three different conditions interact to cause grain spoilage. In addition, the accumulation of fines can promote spoilage or restrict airflow. This module will present solutions, including how aeration prevents uneven grain temperatures during moist conditions in storage, and the importance of checking grain while it is in storage to prevent small problems from developing into large ones.
Fungi and other spoilage organisms grow best at or above 65 percent relative humidity. The air within stored grain should stay below 65 percent relative humidity if possible to prevent spoilage. For wetter corn, temperature becomes the primary control factor.
Moisture migration can cause crusting or spoilage at the top of the bin near the center. Moisture migration can be prevented by cooling the grain with aeration fans. Aeration fans create a negative pressure system pulling cool air down through the grain or a positive pressure system by pushing cool air up through the grain. There are a variety of electronics available to measure grain temperature and monitor the aeration process.
Checking Grain Storage:
Stored grain needs to be checked to monitor grain quality. During the winter months, checking every other week is adequate. Checking once per week during summer, spring, and fall is recommended. Safety should be a priority when checking stored grain. Depending on the severity of the spoilage, correcting a storage problem can be done by aeration fans or grain removal.
Managing Dry Grain in Storage
Dry Grain Aeration Systems Design Handbook
Corn Drying and Storage
Pages / Length:
Permanent link for this product:
*Product contains more buying options
Fan Performance Module
Corn Growth and Development
Corn Growth and Development - Corn Staging
Corn Growth and Development - Key Growth Stages
Soybean Growth and Development
Soybean Growth and Development - Soybean Staging
Soybean Growth and Development - Key Growth Stages
A General Guide for Crop Nutrient and Limestone Recommendations in Iowa
Whole Farm Conservation Best Practices Manual
Crop Production Clipboard
Pasture Management Guide for Livestock Producers
Field Crop Production Handbook
Late Season Corn Scouting
Online review course for the Iowa Certified Crop Adviser Examination
Back to top
Create An Account