Using nitrogen to put grains in a dormant and oxygen deficient state, with slow metabolism, can achieve good insect, mold, and spoilage prevention effects. Grains are not contaminated, and using nitrogen to exhaust air to store grains such as rice, wheat, barley, corn, and rice can prevent insect infestation, heat generation, and mold growth, so as to ensure quality during summer. This method involves tightly sealing the grain with plastic cloth, first creating a low vacuum state, and then filling it with nitrogen gas with a purity of about 98% until the internal and external pressures are balanced. This can cause oxygen deficiency in the grain pile, reduce the respiratory intensity of the grain, inhibit the reproduction of microorganisms, and all pests will die within 36 hours due to oxygen deficiency. This method of reducing oxygen and killing insects can not only save a lot of costs (about one percent of the cost required for fumigation with highly toxic drugs such as zinc phosphide), but also maintain the freshness and nutritional value of food, prevent bacterial infection and drug contamination.
