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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。第二,肥料施入土壤后会发生一些列变化。
Fertilization must consider the soil, which is because: First, fertilization is only needed when the soil is under-supplied with a nutrient. Second, some changes occur when fertilizers are applied to the soil.