碳酸氢铵(有挥发性和腐蚀性,易熏伤种子和幼苗),过磷酸钙(含有游离态的硫酸和磷酸,对种子发芽和幼苗生长会造成伤害),尿素(生成少量的缩二脲,含量若超过2%对种子和幼苗就会产生毒害),氯化钾(含有氯离子),硝酸铵,硝酸钾(含硝酸根离子,对种子发芽有毒害作用),未腐熟的农家肥(在发酵过程中释放大量热能,易烧根,释放氨气灼伤幼苗),这些都不适宜做种肥。种肥要选用含氮、磷、钾三元素的复合肥,其中氮的含量不要过高,否则容易引起 Ammonium bicarbonate (volatile and corrosive, easy to injure seeds and seedlings), superphosphate (containing free sulfuric acid and phosphoric acid, which can cause damage to seed germination and seedling growth), urea (which produces small amounts of biuret, If the content is more than 2% of the seeds and seedlings will be poisoned), potassium chloride (containing chloride), ammonium nitrate, potassium nitrate (nitrate ions, toxic effects on seed germination), not decomposed farmers fertilizer Release a lot of heat during fermentation, easy to burn roots, release ammonia burns seedlings), these are not suitable for fertilizer. The kind of fertilizer to use nitrogen, phosphorus, potassium three elements of fertilizer, nitrogen content should not be too high, otherwise easily lead