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庄稼为什么要施肥庄稼需要吸收养分,和人需要吃饭一样。饭吃不饱,不但身体不健康,也不能很好地劳动;庄稼养分不足,不仅生长细弱,也打不下粮食。庄稼需要的养分很多,重要的有碳、氢、氧、氮、磷、钾、硫、铁、钙、镁等十多种。其中碳、氢、氧三种,庄稼可以从空气和水分中吸收到,其余的几种只有从土壤中才能吸收到。但是土壤中所能供给庄稼吸收的养分是有限的。在土壤中,除了钙、镁、硫、铁足够庄稼需要以外,氮、磷、钾三种,往往不能满足庄稼的要
Why crops need to fertilize crops need to absorb nutrients, just as people need to eat. If food is not enough, not only is the body unhealthy, but it also cannot work very well. The lack of nutrients in the crops not only results in weak growth, but also no food. Crops need many nutrients, such as carbon, hydrogen, oxygen, nitrogen, phosphorus, potassium, sulfur, iron, calcium, and magnesium. Carbon, hydrogen, and oxygen are three of them. Crops can be absorbed from air and water, and the rest can only be absorbed from the soil. But the nutrients that the soil can supply to crops are limited. In the soil, nitrogen, phosphorus, and potassium are not enough to meet the needs of crops except for calcium, magnesium, sulfur, and iron.