Overview of Chemical Fertilizers:Chemical fertilizer is the abbreviation of chemical fertilizer. It is a substance containing one or several nutrient elements made by chemical or physical methods, used to improve soil properties and increase soil fertility levels, and has become an indispensable material input in agricultural production.

HACCP與化肥：The HACCP system is a food safety management system that provides safety guarantees for space food. After years of development, it has been widely applied in the food industry. The International Organization for Standardization has launched the ISO22000 food safety management system based on the HACCP principle, further ensuring food safety.

(1) Classification Based on Fertilizer - Effective Elements:Headings 31.02 to 31.04 are divided according to the fertilizer - effective elements (nitrogen, phosphorus, potassium) in chemical fertilizers. This also involves various factors such as the shape and packaging of the commodity and whether it is used as a fertilizer.

(2) Commodity Classification of Heading 31.05:This item mainly includes four parts: commodities made into a specific shape or packaging; fertilizers containing three fertilizer - effective elements; fertilizers containing two fertilizer - effective elements; and all other fertilizers.

(1) Basic Elements:When declaring chemical fertilizers, basic information such as their use, processing technology, packaging specifications, and whether they have been chemically treated need to be clarified.

(2) Specific Elements:For certain specific commodities, information such as the potassium chloride content by weight, ingredient content, whether it is for fertilizer use, and whether it is mixed with chemical fertilizers also needs to be declared clearly.

(3) Classification and Testing Methods:When classifying chemical fertilizers, various detection methods such as X - ray fluorescence spectroscopy and X - ray powder diffraction can be used to quickly test and identify chemical fertilizers.

In general, understanding the definition, types and customs classification of chemical fertilizers is the key to ensuring their compliance.import and exportAt the same time, for enterprises, being familiar with and strictly following the customs standard declaration elements is also a necessary condition to ensure smooth customs clearance.