1, do not choose a corrosive fertilizer
For example, ammonium bicarbonate and ammonia water are volatile and corrosive. They can easily injure 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. This kind of fertilizer can be applied under the seeding ditch or separated from the seed by a certain soil layer, or mixed with superphosphate and earth fertilizer.
2. Do not choose toxic fertilizers
For example, urea often contains a small amount of biuret, which has toxic effects on seeds and seedlings. In addition, urea molecules with a high nitrogen content penetrate into the protein molecules of the seed, denature the protein, and affect seed germination.
3, do not choose fertilizer containing harmful ions
For example, potassium chloride, ammonium chloride and other chemical fertilizers contain chloride ions, and when applied to the soil, water-soluble chlorides are produced, which are unfavorable for seed germination and seedling growth. Nitrate ions contained in fertilizers such as ammonium nitrate and potassium nitrate also affect seed germination.
4, do not choose unfamed farmyard fertilizer
Commonly used in the countryside, manure, human fecal urine and water are used as seed fertilizers. If it is not cooked, large amounts of heat can be easily burned in the fermentation process to release roots and release ammonia to burn seedlings. Therefore, do not use organic fertilizers that have not been matured. After high-temperature fermentation by stacking, fully decompose them to make them.
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