Advice and answers from the Centaur Analytics Inc. Team
Print

Stored grain problems and their solutions

Updated on

This article explains how to identify common stored grain problems and apply corrective actions to protect grain quality during storage

1. Common Grain Storage Symptoms, Causes, and Corrective Actions

The table below summarizes typical grain storage issues, their most likely causes, and recommended responses. These actions should be taken promptly to limit further deterioration.

Symptom Likely Cause Corrective Action
Musty or spoiled grain odor Heat or moisture accumulation in a localized area Run aeration fans to cool hot spots. If damage is extensive, remove and dispose of the affected grain.
Hard layer below the grain surface High moisture content or spoiled, caked grain mass Operate aeration or drying fans. If compacted grain blocks airflow, remove the affected material and resume cooling and drying.
Warm grain below the surface Elevated grain moisture Operate aeration fans regardless of outside weather conditions until exhaust air temperature reaches the desired grain temperature.
Grain is wet, slimy, sticking together, or frozen Early moisture migration, typically within the first two weeks after filling the bin Run aeration fans to cool the grain until exhaust air temperature equals outside air temperature or the target grain temperature.
Hard, caked crust blocking airflow Severe moisture migration and condensation in the top grain layer Remove spoiled grain from the surface. Run fans to cool remaining grain. Collect samples to assess grain condition below the crust.
Roof condensation dripping onto grain surface Warm grain in cold weather causing strong convection currents and moisture migration Aerate until exhaust air temperature equals the outdoor air temperature at the start of the cycle.
Wet or spoiled spots away from the center of the bin Condensation dripping from roof bolts, fixtures that channel moisture, or roof leaks Inspect for hot spots. Check the roof interior at night for condensation. Inspect and reseal roof inlets, seams, and joints as needed.
Wet or spoiled spot directly under the fill cap Leaking roof cap or condensation from a gravity spout Inspect and reseal the bin cap. Block or disconnect the gravity spout to prevent upward airflow. As a short-term check, hang a bucket under the spout inlet and monitor for water accumulation.
No airflow while fans are running Caked or moldy grain blocking airflow, or a moldy layer above the aeration duct or perforated floor in suction systems Locate spoiled grain to determine extent of blockage. Unload the bin and market sound grain.
White dust released when grain is disturbed Mold growth in the top grain layer Evaluate grain condition, determine the extent of mold damage, and decide whether continued storage is feasible.
Cooling takes longer than normal Excess fines in the grain increasing airflow resistance (two to four times higher than clean grain) Operate aeration fans for a longer duration until both grain temperature and exhaust air temperature reach the desired level.
Exhaust air temperature at the center of the bin surface is warmer than off-center areas Fines concentrated in the center restrict airflow, reducing cooling effectiveness in the core Run fans long enough to cool center exhaust air. Consider drawing down the bin center to remove fines and reduce grain depth to improve airflow.

 

(Source adapted from Purdue University grain storage guidance)