Agricultural salt (coarse salt) is different from salt (commonly known as salt), and its main component is sodium chloride. It also contains magnesium, potassium, sulfur, and a small amount of nutrients needed by crops such as boron and iodine. Although it is not a direct fertilizer for crops, as long as it is reasonably applied, it will have a good effect on some of the sour-sodium crops. If agricultural salt is applied to crops such as sugar beet and celery, sodium ions can substitute potassium ions and magnesium ions adsorbed by soil colloids for crop absorption. At the same time, chloride ions have the effect of inhibiting nitrifying bacteria in the soil, thereby reducing the loss of nitrogen nutrients in the soil. Magnesium, potassium, sulfur and certain trace elements can be used as nutrition for crops. Therefore, it not only increases production, but also improves and improves the quality of hi-sodium crops such as sugar beets and celery. However, rice fields cannot be used for a long period of time alone and agricultural salt alone is applied year after year. Otherwise, sodium ions will destroy the good structure of the soil. When dry, the plate cracks, when wet, it is rotten and sticky, and the permeability deteriorates. At the same time, sodium ions replace the potassium ions in the soil colloids for crop absorption. Although beneficial to the growth of the current crop, due to the dug of stocks of potassium in the soil, the shortage of potassium nutrition in the next crop is caused. A predatory approach. Therefore, the application of agricultural salt can only be used as a supplementary fertilization method. It is imperative that the agricultural salt be applied with reasonable discretion on the basis of increasing the organic fertilizer. Do not apply it more often or for consecutive years. The method of applying agricultural salt is generally mixed with human and animal manure and other organic fertilizers as a base fertilizer, and can also be used for rooting when planting rice seedlings. It can also be directly used as a topdressing fertilizer. Application of 5 kg to 8 kg per acre is appropriate.