Why should the harvested rice be dried?

When crops are not dried, there is a lot of water, and water is a necessary catalyst for respiratory movement. When they breathe, they will generate heat, but the air in the piled things will not circulate, and these discharged heat will be unevenly distributed, which will form a high temperature. At high temperature, a large number of bacteria and fungi will survive, leading to decay and deterioration. Therefore, when storing grains, they should be dry. Its function is to reduce their respiration and achieve long-term non-deterioration.

Water is an important chemical component in rice, which not only has a great influence on the physiology of seeds, but also has a great relationship with the processing and storage of rice and the value of rice. Therefore, after harvest, rice must be dried or dried.

In general, the general water content of rice is 13%? 14%。 The moisture content of dried rice is controlled at about 65438 03%, and the head rice rate can be restored after storage. Appropriate moisture content is an important prerequisite to ensure the smooth processing of rice. Excessive moisture is the main factor of rice fever and mildew.

When the moisture content is lower than 1 1%, the head rice rate is very low in the later stage of rice storage. When the water content of rice is about 18%, it is stored in 1? After 2 days in the sun, the head rice rate of rice will be greatly improved. If conditions permit, it can be stored for 1 day after harvesting and then dried. If it's cloudy, do it. Not sunny 12: 00? When the rice is dried between 15: 00, the rice can be dried to a water content of about 14%, and it is not suitable for over-drying.

The harvest period of rice depends on the maturity of rice, generally from the end of wax maturity to the early stage of full maturity. As far as Lushui is concerned, the best harvest period of hybrid rice planting area is from late August to early September, and the best harvest period of mid-level rice planting area is from late September to early June. After the rice is harvested, it should be dried and cleaned in time.

Harvest rice should be dried as soon as possible, especially when the weather is bad and the water content is high. After harvesting, the rice should be spread out immediately and the net should be closed. Paddy should be spread in thick layer for 1-2 days, and then spread in thin layer for 1-2 days, so that the moisture content reaches about 14% before storage. In order to prevent mildew caused by the pollution of diseased grains such as false smut, reduce the head rice rate and affect rice consumption and commodity quality.

Note: After harvesting, spread the rice on the threshing floor or cement floor, turn it in the sun for 2-4 days to make its water content reach 14%, and then put it in storage.