Among the grains, corn seeds are the most difficult to keep. This is due to the large size of the corn germ, the loose tissue, high protein and soluble sugar content, and the concentration of 80% of the corn kernel. Therefore, poor storage, easy to absorb moisture, infection, mold, mildew and rancidity, shorten life or loss of seed value.
China's vast territory, north and south climate is different, corn cultivation area and total output are second only to rice and wheat. The storage life of corn seeds is closely related to their own water content and meteorological conditions. From the temperature and humidity conditions, the annual average temperature in the country is below 10 °C in the northeast and Inner Mongolia, 10-14 °C in the Yellow River Basin, and above 15 °C in the Yangtze River Basin and its south regions; annual average relative humidity, Yellow River Basin and Its north area is below 70%, Hohhot in Inner Mongolia is only 55%, and the Yangtze River Basin and its south areas are more than 80%. The temperature and relative humidity of the air are increasing from north to south. As far as the moisture content of corn is concerned, according to the test, under the condition that the relative humidity of air is less than 75%, the water content of the cob is often lower than the water content of the grain, and the water in the grain is continuously absorbed by the cob to make it water content. When the seed is in a dry state, it is conducive to safe storage. Conversely, when the relative humidity of the air is higher than 75%, the water content of the cob is higher than the water content of the grain, and the moisture in the air is continuously absorbed and transported to the grain. The water content of the seeds is increased, which affects safe storage.
From this point of view, in the vast area north of the Yellow River Basin in China, there is a natural condition for the corn to be stored without threshing and storage. In the Huaibei area, the farmer also has the habit of storing with ears. After the farmers harvest the corn, they peel off the leaves and bundle them into bundles. After drying and drying, they are placed in a string and suspended in the indoor ventilation and light transmission area for winter. During storage, the grain moisture content remains below safe moisture, and despite the severe winter temperatures, the seeds remain intact. However, in most areas south of the Yangtze River, the relative humidity of the air is longer than 80%. Therefore, the ears should be dried and dried, then threshed and stored. Because chemical fertilizers and pesticides have certain corrosiveness and volatility, they cannot be placed in the same room as seeds to avoid corrosion of seed cells and seed embryos and to reduce seed quality.
After the corn seed of the grain is reduced to less than 14%, it can be packed and stacked in the room, and the bag filled with seeds can be piled into two or four columns, leaving no gap between the bags, but leaving it with the wall. At a distance of 50 cm, a distance of 60 cm should be set between each raft to facilitate seed ventilation and inspection and management at any time. The bottom of the raft is covered with wooden boards and mats to prevent moisture, but the seeds cannot be packed in plastic bags to avoid affecting the breathing and reducing the germination rate. Or cause mildew.
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