Ammonium bicarbonate, ammonia and other fertilizers that have a corrosive effect on seeds 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. Doing fertilizer. This kind of fertilizer should be applied when plowing, or applied to the lower layer of the sowing ditch, not in direct contact with the seeds, or mixed with earth fertilizer.
Fertilizers that are toxic to the seed Fertilizer Urea produces a small amount of biuret when the temperature is too high. If the biuret content 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 poison the seeds and young roots. If it is really necessary to use urea as a seed fertilizer, it must be under the conditions of the athlete's foot and should be isolated from the seed, strictly controlled at no more than 5 kg per acre, mixed with fine soil, and sprinkled 2 to 3 cm below the seed.
Fertilizers containing harmful ions, such as potassium chloride and ammonium chloride, contain chloride ions. When applied to the soil, they will produce water-soluble chlorides, which are harmful to seed germination and seedling growth, and even burn seedlings; ammonium nitrate, potassium nitrate and other fertilizers. Contains nitrate ions, toxic to seed germination.
Alkaline Fertilizers Alkaline fertilizers include kiln ash potassium fertilizer, steel slag phosphate fertilizer, etc. Kiln ash Potash contains more calcium and strong water absorption. After absorbing water, it releases a lot of heat and easily burns seeds and young roots. When seed fertilizer is required, it must be fully mixed with organic fertilizer more than 10 times, and applied to the lower layer of the sowing ditch (hole). Do not make direct contact with the seed, and pay attention to timely covering the soil after sowing to prevent damage.
The unfamed human and animal manure is used as a seed fertilizer without ripening manure, because the fertilizer will release a lot of heat during the fermentation process, not only can easily cause burning of roots, but also release ammonia gas will burn the seedlings. Manure, manure, and other farmyard manures are subjected to high-temperature fermentation after heaping, and they can be fully cooked before they can be used as seed fertilizers.
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