Fertilizer refers to the fertilizer that is applied at the same time as the sowing or mixing with the seed. Fertilizer has great influence on crop seeds. If proper selection can ensure smooth germination of seed and vigorous growth of seedlings, some fertilizers are not suitable for seed fertilizer.
First, there is toxic fertilizer. Urea often contains a small amount of biuret, which is toxic to the seed and seedlings. In addition, urea molecules with a high nitrogen content penetrate into the protein molecules of the seeds, which can denature proteins and affect seed germination.
Second, it is a strong alkaline fertilizer.
Kiln ash potassium fertilizer, steel slag phosphate fertilizer and other alkaline fertilizers are also not suitable for seed fertilizer. Potash kiln ash has strong hygroscopicity, and it releases a lot of heat after absorbing water, easily burning seeds and radicles. When it is necessary to make fertilizer, it must be mixed with organic fertilizer, applied into the sowing ditch, and then sown with cover soil.
The third is fertilizers containing harmful ions.
Potassium chloride, ammonium chloride and other chemical fertilizers contain chloride ions. When applied to the soil, they produce water-soluble chlorides, which are detrimental to seed germination and seedling growth. Nitrate ions contained in fertilizers such as ammonium nitrate and potassium nitrate also affect seed germination.
Fourth, it is a corrosive fertilizer.
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 harm 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.
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