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施肥必须考虑土壤,这是因为:第一,只有在土壤对某一养分供应不足时,才需要施肥,并不需要把所有的必需元素施入土壤,因为大多数营养元素,土壤(或大气)已能充分供应,否则会造成浪费,甚至造成作物中毒。这一点有时被忽视。第二,肥料施入土壤后会发生一系列变化,会在不同程度上影响肥料效果,不考虑土壤,也就谈不上真正的合理施肥。如在水田中施用硝态氮肥,必然会降低肥效等。
Fertilization must consider the soil because: First, fertilization is not needed when the soil is under-supplied with a nutrient and does not require all the necessary elements to be applied to the soil because most nutrients, soils (or the atmosphere) Has been fully supplied, otherwise it will cause waste and even cause crop poisoning. This is sometimes overlooked. Second, a series of changes occur when fertilizers are applied to the soil, affecting the fertilizer effect to varying degrees. Without considering the soil, there is no real reason for fertilization. As in the paddy nitrate fertilizer application, will inevitably reduce fertilizer and so on.