Seed fertilization is an important method of scientific fertilization, but the application of seed fertilizer is technically strong, especially the selection of seed fertilizer is very particular. Improper use of seeds is harmful to the seeds and their rooting, thus delaying the season and causing losses. In the selection of seed fertilizers, there are the following "four taboos."
Do not use corrosive fertilizers, such as ammonium bicarbonate, ammonia water, etc., 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 to do fat. 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.
Avoid the use of toxic fertilizer urea in the growth process of the crop, often produce a small amount of adipic acid, the content of acetonitrile if more than 20%, will produce poison to the seed 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.
Avoid strong alkali fertilizers Alkaline fertilizers include kiln ash potash, steel slag phosphate fertilizer, etc. Kiln ash potash contains more calcium, strong water absorption, absorbs mature lime, and releases a lot of heat, easily burning seeds and young roots. When composting, it must be fully mixed with organic fertilizer which is higher 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 so as to prevent damage.
Avoid using unripe farmyard fertilizers. Farmhouse manures that have been adequately decomposed can be used as seed fertilizers. They are applied near the seeds when sown, and they work well. However, if the farmyard manure is not cooked as a fertilizer, the fertilizer will release a lot of heat during the fermentation process, which will not only easily cause burning of roots, but will also cause ammonia to burn the seedlings. Farmyard manures are subjected to high-temperature fermentation after stacking, and they can be used as seed fertilizers after they are fully cooked.
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