Organic fertilizer raw materials and proportions

Organic fertilizer raw materials generally come from animal husbandry and agricultural solid waste. There are many raw materials suitable for making organic fertilizers. To choose suitable raw materials, you must first understand the basic properties of various raw materials, especially some characteristics suitable for industrialization and commercial production. For example, whether the source of raw materials is extensive and stable, whether the nutrient indicators of the raw materials meet the requirements for making organic fertilizers, and whether the raw materials can be rapidly decomposed.

According to the amount used, raw materials can be divided into two types: main materials and auxiliary materials.

The main material is the main raw material for the production of organic fertilizer, usually the proportion of this kind of material is 60%-80%. The main material is composed of one or several raw materials, such as livestock and poultry manure, biogas residue, etc.

The auxiliary materials are mainly used to adjust the moisture, C/N, pH and permeability of materials, and are composed of one or several raw materials. Usually, the proportion of such raw materials in the whole material does not exceed 40%, and the proportion of a single material does not exceed 20%. Common ones are crop straw, mushroom residue, fly ash, quicklime, attapulgite powder, superphosphate or phosphate rock powder.

According to the nature of raw materials, raw materials can be divided into carbon raw materials, nitrogen raw materials, conditioner raw materials and other types.

Carbon raw materials refer to those raw materials with high organic carbon content, such as crop straw, fly ash, etc. Such raw materials can be used as the main auxiliary materials of organic fertilizers to adjust moisture, C/N and enhance the permeability of substances.

Nitrogen raw materials usually refer to those raw materials with a C/N value below 30%, which are the main materials of organic fertilizers, such as livestock and poultry manure, biogas residues, etc. There are also factories that use urea as a high nitrogen raw material for adjusting C/N, but this is not the main material.

Conditioner raw materials mainly refer to the materials added to the compost to adjust the properties of the raw material mixture, such as pH, moisture, C/N, etc. For example, less lime and grass ash are added to compost to neutralize the organic acid produced in the decomposition of organic matter to adjust the acidity; some highly absorbent substances such as crushed clay, peat, and sawdust are added to adsorb the ammonia released during the decomposition process. , in order to preserve nutrients and improve the quality of organic fertilizer. Adding some sawdust, straw powder and other conditioners is used to balance the moisture content in the compost raw material and increase the amount of organic matter in the material, which can prevent the moisture content in the material from being too high.