油母页岩是低品位油母页岩经多年自燃风化而成的肥料。它含有速效性的氮、磷、钾养分,同时肥劲较长,施后第二年还可继续发挥肥效。 Oil shale is a low-grade oil shale gas after years of spontaneous combustion of fertilizer. It contains quick-acting nitrogen, phosphorus and potassium nutrients, and at the same time exerts a long-lasting effect. It can also continue to exert its effect in the second year after its application.