Influence of the safety of raw materials and excipients on microbial fertilizers

Raw materials and excipients have an important impact on maintaining the survival, efficacy and safety of microorganisms in the product, and are also one of the main components of the product.
It is clarified that the raw materials and auxiliary materials used in the production of biological fertilizers should meet the following requirements: the wastes processed with livestock and poultry manure, animal and plant residues, and animal and plant products as raw materials must be fermented and decomposed and meet the requirements of harmlessness. Oriented as raw materials and auxiliary materials for the production of microbial fertilizers; it is not suitable to use materials such as fly ash and other chemically synthesized carbon materials such as mineralized carbon and waste plastic powders for biological fertilizer production; it is also not suitable to use raw materials that may bring potential risks to biological safety, such as protein-rich materials. The antibiotic industrial waste residue, which is applied to the field will induce the growth of drug-resistant bacteria.
At present, various raw materials and auxiliary materials are used for the production of microbial fertilizers. In addition to the traditional fermented livestock manure, straw and other agricultural wastes, in recent years, such as the leftovers of the monosodium glutamate factory, sugar industry, paper industry, etc., domestic waste , urban sludge, bentonite, diatomaceous earth, coal powder, lignite, nutrition, etc., their composition is complex, and there are potential safety hazards such as heavy metals, pathogenic bacteria, and antibiotic residues.
At present, the excessive heavy metal content has caused widespread concern in the society, especially the heavy metal content of edible agricultural products exceeds the standard. The large-scale application of organic fertilizers containing high heavy metals causes the rapid increase of soil heavy metal content, which must be paid enough attention. production of microbes
The microorganisms of the material fertilizer are safe, and the hidden dangers of the microbial fertilizer are often caused by the insufficient control of raw materials and auxiliary materials.
Quality safety and effect assurance are very important, because it is not only a carrier, but also a “food” for microorganisms. It not only provides materials for the manufacture of microorganisms and their metabolites, but also provides energy for the growth, metabolism and reproduction of microorganisms. Specifically, only when microorganisms have available organic sources can they proliferate in large quantities, and only then can they metabolize, fix nitrogen, and activate the energy of potassium and phosphorus minerals; can they synthesize active substances such as polysaccharides, polyamino acids, biological hormones, etc. , soil aggregate structure of aeration function, etc.
Good organic matter raw materials can be decomposed by microbial fermentation, and the carbon source contained in this organic matter is usually called fermentable carbon. And this organic matter carrier (fermentable carbon) that can be decomposed by microorganisms is directly related to its source. Therefore, it is necessary to clarify the source and type of various raw materials, auxiliary materials and other organic carriers used in microbial fertilizers, which is also convenient for its safety. On the contrary, microbial fertilizers made of inorganic materials such as bentonite, diatomite, and fly ash as carriers (or adsorbents) have slow performance and even insignificant fertility because of the lack of organic matter carriers (fermentable carbons). ) for bacterial growth.