What kind of fertilizer can't be made into fertilizer?

What kind of fertilizer can't be made into fertilizer? What's the reason? Experienced netizens are also asked to introduce that seed fertilizer is usually applied near or mixed with seeds to provide nutrients for the initial growth of crops during sowing or transplanting, but some fertilizers should not be applied directly near seeds so as not to cause seed burning and rotten seeds, resulting in lack of seedlings and broken ridges. Therefore, the farming network has sorted out some fertilizers that should not be used as crop fertilizers, which are listed in detail for netizens' reference. First, ammonium bicarbonate and ammonia, which have corrosive effect on seeds, are volatile and corrosive, and are easy to fumigate seeds and seedlings. Calcium superphosphate contains free sulfuric acid and phosphoric acid, which will cause harm to seed germination and seedling growth. Generally speaking, it is not suitable to be used as seed fertilizer. Such fertilizers should be applied during ploughing, or in the lower layer of the sowing ditch, without direct contact with seeds, or mixed with soil and miscellaneous fertilizers. Second, fertilizer urea, which is toxic to seeds, will produce a small amount of biuret if the temperature is too high in the process of granulation. If the biuret content exceeds 2%, it will be toxic to seeds and seedlings. In addition, the urea molecule with high nitrogen content penetrates into the protein molecule of the seed, denaturation the protein and cause toxicity to the seed germination and young root. If it is really necessary to apply urea as a seed fertilizer, it must be under the condition of sufficient moisture, and it should be isolated from the seeds, strictly controlled at no more than 5 kg per mu, mixed with fine soil and sprinkled 2-3 cm below the seeds. Third, fertilizers such as potassium chloride and ammonium chloride containing harmful ions contain chloride ions, which will produce water-soluble chlorides when applied to the soil, which is disadvantageous to seed germination and seedling growth, and even burn seeds and seedlings; fertilizers such as ammonium nitrate and potassium nitrate contain nitrate ions, which are toxic to seed germination. Strong alkaline fertilizers include kiln ash potash fertilizer, steel slag phosphate fertilizer and so on. Kiln ash potash fertilizer contains more calcium, strong water absorption, gives off a lot of heat after water absorption, and is easy to burn seeds and young roots. If it is necessary to make seed fertilizer, it must be fully mixed with more than 10 times of organic fertilizer, applied to the lower layer of the sowing ditch (hole), do not come into direct contact with the seeds, and pay attention to cover the soil in time after sowing to prevent harm. 5. Unrotten human and animal manure is used as seed fertilizer, because the fertilizer will release a lot of heat energy in the process of fermentation, which is not only easy to burn roots, but also burn seedlings. Farm manure, such as human and animal manure, should be fermented at high temperature and fully mature before it can be used as fertilizer. What should we pay attention to when applying fertilizer? Fertilizer that cannot be mixed