Soybean storage

Storage characteristics

In addition to the mildew, condensation, rot, deterioration, and aging commonly encountered by grain and oil crops, soybeans have the following characteristics:

1. Soybeans have good moisture absorption When the water content of soybeans exceeds 14-15%, the grains tend to become soft.

2. Soybeans are susceptible to "changing" and "moving oil". Soybeans "changing" and "moving oil" are common undesirable changes in storage. Longer shelf life of soybeans, after a high temperature season, although no heat, mildew, but the color of the cotyledon near the umbilical parts will deepen, turning red (commonly known as red-eye). With the extension of storage time, the red color of the cotyledons has deepened and expanded, commonly known as "red change." The phenomenon of peeling occurs when the skin becomes severe, and it appears transparent at the beginning of the leaf. It is commonly called "walking oil". This is the phenomenon of soybean aging.

The characteristic of soybean mildew is that the beans are softened and their volume increases. They begin to generate heat and the red circle appears in the embryo. The color of the cotyledon is deepened, and a mildew smell is produced. With aged or poisoned soybean oil, the amount of oil produced is reduced, the oil color is deepened, and the cake is brown.

3. Soybeans tend to lose the high moisture content of soybeans. When the temperature rises to 25°C, it is difficult to maintain the germination rate. The length of time to maintain the germination rate is related to factors such as temperature and seed coat color. Black soybeans have a longer germination rate, and yellow soybeans are most susceptible to loss of germination. This is due to the deeper color of the seed coat tissue and the relatively weak metabolism. The greater the moisture, the higher the temperature, the faster the loss of germination.

Soybean Storage Measures

At present, foreign stockpiles of soybeans are usually made of concrete, and their diameter is generally 6-12 meters, 45 meters high, and from two to three rows. China has also built a number of such silos, but most of them still use flat-style warehouses. Soybeans must be washed and dried before entering the warehouse. In particular, soybeans with high moisture content must be dried before they are put into storage. In China, the sun is mainly used. Tests have shown that sun exposure has no adverse effect on soybean oil production, but care should be taken not to expose it to high temperatures under the hot sun.

A large-scale commercial grain storage facility is provided with a temperature control device. When a local overheat signal occurs, this portion must be transported to another warehouse for a downsizing operation or sent to a production workshop for processing. This movement, mixing high-moisture soybeans with low-moisture soybeans, can control soy fever.

Soybeans are oils that are not prone to insects. For occasional pests, the method of sifting out the air is generally used, and the effect is good.