农作物获得产量,必须不断地从土壤中吸收各种营养物质,其中氮磷钾三种营养元素吸收量最大。而土壤经过连年耕种,将其地上部分有机物质收获,施入土壤中的有机肥料数量少,质量低,增施的化肥又比较单一化,土壤中三种主要营养入不敷出,破坏了土壤原有氮磷钾养分平衡状态。一些高产地块肥力明显下降,出现缺氮少磷,不协调现象,产量受到影响,不少群 The crop yield, must continue to absorb a variety of nutrients from the soil, of which the three elements of nitrogen, phosphorus and potassium absorption of the largest. The soil after years of cultivation, the aboveground organic matter harvest, the amount of organic fertilizer applied to the soil is low, low quality, additional fertilizer more sole, the three main nutrients in the soil make ends meet, destroying the original soil nitrogen Phosphorus and potassium nutrient balance. Some high-yield plots decreased significantly fertility, there is a lack of nitrogen and phosphorus, uncoordinated, affected output, many groups