一、多效硅肥在石灰性水稻土上应用的由来　　硅虽然不是作物生长的必需营养元素 ,但禾本科作物对硅的吸收量相当于氮磷钾吸收量的总和 ,如此高的吸收量势必会影响到作物的生长发育。 195 4年日本在水稻田施用熔渣试验 ,明确了熔渣对水稻的增产作用不是石灰而是硅素的作用 ,以 First, the application of multi-effect silicon fertilizer in the calcareous paddy soil Although silicon is not an essential nutrient for crop growth, but the amount of silicon absorbed by gramineous crops is equivalent to the sum of nitrogen, phosphorus and potassium absorption, such a high absorption is bound Will affect the crop growth and development. 195 4 years Japan in the paddy field test slag application, it is clear that the role of slag production of rice is not the role of lime but the role of silicon to