Which four types of fertilizer should not be used as seed fertilizer

The corrosive fertilizer ammonium bicarbonate is volatile and corrosive, and easily smothers seeds and seedlings. Superphosphate contains free sulfuric acid and phosphoric acid, which can cause damage to seed germination and seedling growth. Generally, it is not suitable for seed fertilizer.

The toxic fertilizer urea often produces a small amount of adipic acid during the growth of the crop. If the content of the adipic acid exceeds 20%, it will be toxic to the seeds and seedlings. In addition, urea molecules with high nitrogen content penetrate into the protein molecules of the seed, denature the protein, and poison the seed germination and radicle.

Fertilizer containing harmful ions, potassium chloride and other chemical fertilizers containing chloride ions, will produce water-soluble chloride after application to the soil, which is unfavorable for seed germination and seedling growth, and is easy to burn and burn. Nitrate ions contained in fertilizers such as ammonium nitrate and potassium nitrate have a toxic effect on seed germination.

Unfertilized farmyard manure is commonly used in the countryside as manure, manure and urine, etc. If it is not decomposed, a large amount of heat is released during the fermentation process, and the root system is released, and ammonia is burned to burn the seedlings. Therefore, the unfertilized organic fertilizer should not be applied, and it can be fertilized after being fermented at high temperature and fully decomposed.

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