What are the technical standards for commercial organic fertilizers?

Organic fertilizer, also known as farmhouse fertilizer, mainly comes from organic matter that can be used as fertilizer in rural and urban areas, including human and livestock manure, crop straw, green manure, etc., which is made by microbial fermentation and decomposition. Organic fertilizer is widely available, there are many varieties, and almost all materials that contain organic matter and can provide a variety of nutrients can be used as organic fertilizer. Organic fertilizer can provide crop nutrients, maintain soil fertility, and improve crop quality, so it is necessary to implement a fertilization system combining organic fertilizer and chemical fertilizer.

With the development of agriculture, a large number of enterprises producing organic fertilizer have emerged, and organic fertilizer has gone beyond the limitations of farm fertilizer to develop in the direction of commercialization.

The state has issued the agricultural industry standard NY525-2002. Commercial organic fertilizer must be registered in accordance with the fertilizer registration management measures, and obtain the registration certificate number, before it can be circulated and sold in the agricultural market. The technical indicators of organic fertilizer are shown in Table 2-1.

Table 2-1 Technical indicators of organic fertilizers (NY525-2002).

Item indicators: organic matter (on a dry basis), %30 total nutrients (N+P2O5+K2O), % moisture (free water), %20 pH, pH value.

The heavy metal content, roundworm egg mortality rate and E. coli value index in organic fertilizer should meet the requirements of GB 8172.

Legal Analysis: Requirements:

Appearance; Organic fertilizers are brown or gray-brown, granular or powdery, free of mechanical impurities, and free of foul odor.

The project indicators of organic fertilizer should meet the following requirements.

Project metrics. Organic matter content (on a dry basis) (45

Total nutrient (nitrogen + phosphorus pentoxide + potassium oxide) content (on a dry basis) (

Moisture (free water) content (%30

The heavy metal content, roundworm egg mortality rate and E. coli value index in pH organic fertilizer should meet the requirements of GB8172.

The national standard for organic fertilizers stipulates the technical requirements, test methods, testing rules, identification, packaging, transportation and storage of organic fertilizers. The industry standard "Organic Fertilizer" is in charge of the Ministry of Agriculture and Rural Affairs. This standard is applicable to organic fertilizers made from by-product resources rich in organic matter such as livestock and poultry manure, animal and plant residues as the main raw materials, and after fermentation and decomposition.

This standard does not apply to green manure, farmyard manure and other organic manure that farmers have accumulated themselves.

Normative: The clauses in the following documents become the clauses of this standard by reference to this standard. All subsequent revisions (excluding errata) or revisions of dated references are not applicable to this standard, however, parties who have reached an agreement under this standard are encouraged to investigate the possibility of using the latest versions of these documents.

The most recent version of an undated reference applies to this standard.

Preparation of standard solutions for GB-T601 chemical reagent titration analysis (volume analysis).

Representation and determination of the limit value of GB T1250.

GB T6679 General Rules for Sampling of Solid Chemical Products.

GB T6682 Analytical Laboratory Water Specifications and Test Methods.

GB8172 Agricultural control standard for urban waste.

GB T8576 Determination of free water content in compound fertilizer, vacuum oven method.

GB18382 fertilizer identification content and requirements.

Legal basis: "Organic fertilizer" article organic fertilizer production raw materials should follow the basic principles of "safety, hygiene, stability and effectiveness", give priority to the selection of applicable raw materials in the appendix, prohibit the selection of fly ash, steel slag, sludge, domestic garbage (except for kitchen waste after classification and aging), materials containing invasive alien species and materials prohibited by laws and regulations and other prohibited raw materials with potential safety hazards. The selection of evaluation raw materials must be evaluated and passed through the safety assessment before they can be used in the production of organic waste.