Blended fertilizer, also known as BB fertilizer or dry mixed fertilizer, is a fertilizer made by mechanically blending two or more types of single or compound fertilizers with similar particle sizes in a certain proportion. Here are some specific information about blended fertilizers:

1. Characteristics
Flexible formula: The proportion of nutrients such as nitrogen, phosphorus, and potassium can be adjusted according to different crops, soil types, and nutrient requirements to meet the growth needs of various crops.
Simple production process: The production process mainly involves mixing different base fertilizers without the need for complex chemical reactions. This makes the production of blended fertilizers relatively easy and cost-effective.
Wide applicability: Suitable for various soils and crops, it can be used as base fertilizer and topdressing.

2. Advantages and disadvantages
advantage:
Highly targeted, the formula can be customized according to specific soil and crop conditions to improve fertilizer utilization, reduce waste, and promote cost saving and efficiency improvement.
The production process is relatively simple, with low investment, low cost, and easy to promote and apply.
The production method is flexible, and it can be prepared in any place such as urban and rural areas, factories, etc. The production volume can be large or small, without "three wastes" pollution.
The fertilization methods are flexible and diverse, including machine application, planting application, spreading application, strip application, hole application, etc.
Disadvantages:
The requirements for basic raw materials are high, and it is necessary to ensure that the particle size and density of the raw materials are uniform and consistent, otherwise it is easy to cause layering and affect the fertilization effect.
Easy to absorb moisture and clump. In environments with slightly higher humidity, components such as urea in mixed fertilizers will absorb a certain amount of water, leading to clumping.
Due to differences in raw material density and particle size, mixed fertilizers are prone to layering during transportation and storage, and need to be mixed multiple times upside down during use.

In summary, blended fertilizer is a fertilizer customized according to soil and crop needs, with advantages such as flexible formula, simple production process, and wide applicability. However, it also has disadvantages such as high requirements for raw materials, easy moisture absorption and agglomeration, and easy layering. When using, it should be selected and applied reasonably according to specific circumstances.