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Corrosive fertilizers Ammonium bicarbonate and ammonia are volatile and corrosive. They are easy to smear 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. Such fertilizers can be applied under the seeding ditch or separated from the seed by a certain soil layer, or mixed with superphosphate and soil fertilizer.
The toxic fertilizer urea often contains a small amount of biuret, which is toxic to seeds and seedlings. In addition, urea molecules with high nitrogen content penetrate into the protein molecules of the seeds, denature the proteins and affect seed germination.
Fertilizers containing harmful ions Potassium chloride, ammonium chloride and other chemical fertilizers contain chloride ions, which produce water-soluble chlorides when applied to the soil, which is detrimental to seed germination and seedling growth. The nitrate ions contained in fertilizers such as ammonium nitrate and potassium nitrate also have an effect on seed germination.
Strong alkaline fertilizers such as kiln ash potassium fertilizer and steel slag phosphate fertilizer are not suitable for seed fertilizer. The kiln ash potassium fertilizer has strong hygroscopicity, and releases a large amount of heat after absorbing water, which easily burns out seeds and radicles. When it is necessary to make a seed fertilizer, it must be mixed with organic fertilizer, applied to the seeding ditch, and then planted with soil.
Fertilizer refers to fertilizer that is applied at the same time as seeding or mixed with seeds. The effect of seed fertilizer on crop seeds is very large. If proper selection can ensure the smooth germination of crop seeds and the growth of seedlings, some fertilizers are not suitable for crop seed fertilizers. Fertilizers that are not suitable for crop seed fertilizers are:
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