一、外包装识别法。主要看生产许可证、肥料登记证、产品合格证是否齐全有效。二、简易目测法。专用复合肥都经过一套复杂程序挤压造粒或圆盘造粒,颜色表现为灰白色或淡灰色,很少有杂色,且造粒均匀,或圆形或圆柱形。 First, the packaging identification method. Mainly to see the production license, fertilizer registration certificate, product certification is complete and effective. Second, simple visual method. Specialized compound fertilizers have passed through a complex process of extrusion granulation or disc granulation, the color is gray or light gray, with little variegated, and granulation, or round or cylindrical.