Fertilizer refers to the fertilizer that is applied to soaking, seed dressing or sowing in the vicinity of the seed before sowing. Fertilizer application technology is strong, especially the selection of seed fertilizer is very particular, otherwise it is easy to harm the seeds and their roots to germinate, thus delaying the season and causing losses. In the selection of seed fertilizers, remember “five taboosâ€.
1. Avoid corrosive fertilizer
Ammonium bicarbonate, ammonia water, etc., have volatile and corrosive, easily smoked seeds and seedlings, superphosphate contains free sulfuric acid and phosphoric acid, will cause damage to seed germination and seedling growth, generally not suitable for seed 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.
2. Avoid toxic fertilizers
During the growth of crops, urea often produces a small amount of adipic acid. If the content of acetonitrile exceeds 20%, 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.
3. Avoid using fertilizers with harmful ions
Potassium chloride, ammonium chloride and other chemical fertilizers contain chloride ions, which when applied into the soil will produce water-soluble chlorides, which are unfavorable to seed germination and seedling growth, and even burn seeds to burn seedlings. Ammonium nitrate, potassium nitrate and other fertilizers contain nitrate ions. It has toxic effects on seed germination.
4. Avoid strong alkaline fertilizer
Strong alkali fertilizers include kiln ash potash fertilizer and steel slag phosphate fertilizer. Kiln ash Potash contains more calcium and is hygroscopic. 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.
5. Avoid using unfaid human and animal dung
In general, farmyard manure, such as manure, livestock and manure, can be used as a seed fertilizer, and it is applied to the seed near the seeding, which is very effective. However, if raw manure is not used as a compost, fertilizer will release a large amount of heat during the fermentation process, which will not only easily cause burning of roots, but also release ammonia gas to burn seedlings. Manure, livestock manure and other farmyard manures are subjected to high-temperature fermentation by heaping and fully cooked before they can be used for seed fertilizers.
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