Why is it necessary to dry harvested food grains before storage?

Proper drying of harvested grains is absolutely critical for preserving grain quality, preventing losses, and ensuring food safety during storage periods that may extend several months.

Freshly harvested grains typically contain 20-25% moisture content, which creates an ideal environment for microbial growth, particularly fungi and bacteria. These microorganisms cause grain spoilage, producing mycotoxins that make food unsafe for human and animal consumption. High moisture also promotes the growth of molds that produce aflatoxins—dangerous carcinogens that can contaminate entire grain batches.

Excess moisture accelerates insect infestation, as stored grain pests like weevils, beetles, and moths thrive in humid conditions and reproduce rapidly, causing massive losses. Wet grains also undergo faster respiration, generating heat that further elevates storage temperature and moisture—a self-perpetuating cycle of deterioration.

By reducing moisture content to 12-14% for most cereals and 8-9% for pulses through sun-drying or mechanical dryers, farmers create unfavorable conditions for pests and microbes. Dry grains maintain their nutritional value, germination capacity (for seeds), market quality, and weight, preventing economic losses. Proper drying also prevents grains from clumping together, making storage, handling, and transportation much easier.