The test of grain spending sumur was carried out in large warehouse.

For achieving goods effect, the ventilation cages were installed in large warehouse.

Research of grain storage technology of large warehouse in northeast China;

Three large warehouses were selected for in-store drying of corn.

According to the characteristic of high temperature and high humidity in south Chine,choosing the best opportunity to control insects and the suitable control dose,and improving the heat insulation,the large warehouse may realize the recirculation fumigation once a year to kill the stored grain insect thoroughly,reduce the dose,delay aging speed of the grain quality.

Making use of the advantage time in low temperature in winter and spring,using method of mechanical yen- tilation for bulk wheat in the large storehouse to descend grain temperature,thereafter,sealing the grain bulks, heat insulating to prevent pest.

Making use of advantageous time of low temperature in winter and spring,mechanical ventilation for bulk wheat in large storehouse was carried out to descend grain temperature,thereafter,heat insulating and sealing the grain bulks and low temperature grain storage test was carried out.

The structure,construction,long term storage and mechanical ventilation of large warehouse were evaluated comprehensively.

The ventilation system with the vertical ventilation ducts was used in the sealed bulk grain in large warehouses.

Mechanical ventilation with the cages on the ground was tested in large steel warehouse.

The detal of 50 kinds of warehouse measurements were collected.

The ceiling of warehouse was rebuilt for insulation heat,and then mechanical ventilation was tested for low temperature storage.

Recirculation fumigation in new built warehouse were tested.