One is a fertilizer with corrosive effects. Ammonium bicarbonate is volatile and corrosive, easily smothers 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.
The second is a fertilizer with toxic effects. In the process of crop growth, urea often produces a small amount of biuret. If the content of biuret exceeds 2%, it will cause toxicity to seeds and seedlings. In addition, urea molecules with high nitrogen content penetrate into the protein molecules of the seed, denature the protein, and poison the seed germination and radicle.
The third is a fertilizer containing harmful ions. Fertilizers containing chloride ions, such as potassium chloride, produce water-soluble chlorides when applied to the soil, which are detrimental to seed germination and seedling growth, and even burn seedlings. Nitrate ions contained in fertilizers such as ammonium nitrate and potassium nitrate have a toxic effect on seed germination.
The fourth is unfertile farmyard manure. Commonly used in rural areas are manure, human waste water and so on.
The second is a fertilizer with toxic effects. In the process of crop growth, urea often produces a small amount of biuret. If the content of biuret exceeds 2%, it will cause toxicity to seeds and seedlings. In addition, urea molecules with high nitrogen content penetrate into the protein molecules of the seed, denature the protein, and poison the seed germination and radicle.
The third is a fertilizer containing harmful ions. Fertilizers containing chloride ions, such as potassium chloride, produce water-soluble chlorides when applied to the soil, which are detrimental to seed germination and seedling growth, and even burn seedlings. Nitrate ions contained in fertilizers such as ammonium nitrate and potassium nitrate have a toxic effect on seed germination.
The fourth is unfertile farmyard manure. Commonly used in rural areas are manure, human waste water and so on.
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