Compound fertilizer is to point to contain two or more than two kinds of nutrition elements of fertilizer, compound fertilizer has high nutrient content and less vice composition and physical properties is good wait for an advantage, for balanced fertilization, improve the utilization rate of fertilizer to promote high and stable yield of crops has a very important role.But it also has some disadvantages, such as it is always a fixed proportion of nutrients, and needed for different soil and crop nutrition element types, quantity and proportion is varied.Before using the best for soil testing, therefore, to understand the field soil texture and nutritional status, also pay attention to the unit and fertilizer application, can obtain the better effect.