Buy fertilizer has a stress

Fertilizer refers to fertilizer that is applied near the seed or mixed with the seed when sowing or planting. Appropriate fertilization can meet the needs of crops for nutrients as soon as possible, but also can save the top-dressing laborers, on the contrary, it will harm the seeds. Therefore, when applying fertilizer, pay attention to the following points:

No corrosive fertilizer is selected. Ammonium bicarbonate and ammonia water are volatile and corrosive. They can easily injure seeds and seedlings. Superphosphate contains free sulfuric and phosphoric acids, which can cause harm to seed germination and seedling growth. Generally, it is not suitable for seed fertilizer. Such fertilizers can be applied under the seeding ditch or separated from the seed by a certain soil layer, or mixed with superphosphate and earth miscellaneous fertilizers.

Do not choose toxic fertilizers. In the process of growing crops, urea often produces a small amount of biuret. If the content of this substance exceeds 2%, it will poison the 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.

Do not choose fertilizers that contain harmful ions. Potassium ammonium chloride, ammonium chloride and other chemical fertilizers contain chloride ions. When applied to the soil, they produce water-soluble chlorides, which are harmful to seed germination and seedling growth. Nitrate ions contained in fertilizers such as ammonium nitrate and potassium nitrate are used to germinate seeds. influential.

Do not choose strong alkaline fertilizers. Potash ash potash, steel slag phosphate fertilizer and other alkaline fertilizers are also not suitable for seed fertilizer. Potash ash potash contains more calcium, strong hygroscopicity, and becomes mature lime after absorbing water, releasing a lot of heat and easily burning out seeds and young roots. When seed fertilizer is required, it must be mixed with organic fertilizer and applied into the sowing ditch. Reseeding the cover soil can avoid hazards.

Do not choose unfamed farmyard fertilizers. In rural areas, farmyard manure, manure, urine, and other farmyard manure are commonly used as seed fertilizers. If the manure is not cooked, releasing large amounts of heat during the fermentation process can easily burn the root system and release ammonia to burn the 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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