What are the types of biological fertilizers and microbial fertilizers

And also.. Plant-based fertilizers such as milk vetch.

Microbial fertilizer is a product containing specific microorganisms, which is used in agricultural production, through the life activities of the microorganisms contained in it, to increase the amount of plant nutrients or promote plant growth, increase yield, improve the quality of agricultural products and agricultural ecological environment (NY T 1113-2006 microbial fertilizer terminology).

According to the current standards, microbial fertilizers are mainly divided into two categories, namely microbial agents (referred to as microbial agents) and microbial fertilizers (referred to as microbial fertilizers), of which microbial microbial agents are divided into the following 9 varieties according to the types or functional characteristics of microorganisms contained therein: rhizobia agent (NY 410-2000 rhizobia fertilizer), nitrogen-fixing bacterial agent (NY 411-2000 nitrogen-fixing bacterial fertilizer), phosphorus-solubilizing microbial agent (NY 412-2000 phosphorus bacterial fertilizer), silicate microbial agent (NY 413-2000 silicate bacterial fertilizer), photosynthetic bacterial agent (NY 527-2002 photosynthetic bacterial agent), organic material decomposition agent (NY 609-2002 organic material decomposition agent), growth promoter, mycorrhizal agent, bioremediation agent (GB 20287-2006 agricultural microbial agent); Microbial fertilizers include bio-organic fertilizers (bacteria + organic matter fertilizers) (NY 884-2012 bio-organic fertilizers) and compound microbial fertilizers (bacteria + organic matter fertilizers + inorganic nutrients) (NY T 798-2015 compound microbial fertilizers).

There are many types of biological fertilizers, and the main ones that are now popularized and applied are rhizobia fertilizers, nitrogen-fixing bacteria fertilizers, phosphate and potassium dissolving bacteria fertilizers, antibiotic bacteria fertilizers and fungal fertilizers, and so on. Some of these biological fertilizers are products containing a single effective bacteria, and some are compound products made by mixing nitrogen-fixing bacteria and phosphate and potassium dissolving bacteria.

At present, except for a few fertilizer products such as rhizobia that contain a single effective bacteria, most of the products on the market are compound biological fertilizers.

Classification of fertilizers:

1. Physiological acidic fertilizer. In the aqueous solution of chemical fertilizer, the grass absorbs too many cations from the fertilizer, and the remaining anions generate the corresponding acids, making the solution acidic, and most of the ammonium salts and potassium salts belong to this type of fertilizer.

2. Physiological alkaline fertilizer beam cover. If the anion absorbed and utilized by the forage grass is faster than the cation absorbed and utilized, the cation in the soil solution is excessive, and the corresponding alkaline compounds are generated, so that the solution becomes alkaline, such as calcium nitrate, magnesium nitrate, etc., are alkaline fertilizers.

3. Physiological neutral fertilizer. The rate at which the grass absorbs anions and cations is about the same, and the soil solution has a neutral reaction, such as potassium nitrate, ammonium nitrate, urea, etc. According to the composition of nutrients, chemical fertilizers can be divided into:

Nitrogen fertilizer, phosphate fertilizer, potassium fertilizer, compound fertilizer, trace elements, etc. According to the use, chemical fertilizers can be divided into: base fertilizer and top dressing.

(1) Nitrogen fertilizer: that is, chemical fertilizer with nitrogen nutrients as the main component, including ammonium bicarbonate, urea, ammonium pin, ammonia, ammonium chloride, ammonium sulfate, etc.

2) Phosphate fertilizer: that is, chemical fertilizer with phosphorus nutrients as the main component, including calcium phosphate, calcium, magnesium and phosphorus fertilizer.

3) Potassium fertilizer: that is, chemical fertilizer with potassium nutrients as the main component, which is not used much at present, and the main varieties are potassium chloride, potassium sulfate, potassium nitrate, etc.

4) Compound and mixed fertilizer: that is, the fertilizer contains two kinds of fertilizer three elements (nitrogen, phosphorus, potassium) of the binary compound and mixed fertilizer and the three elements of nitrogen, phosphorus and potassium. Among them, mixed fertilizer has been promoted quickly throughout the country.

5) Trace element fertilizers and some medium element fertilizers: the former is such as fertilizers containing boron, zinc, iron, molybdenum, manganese, copper and other trace elements, and the latter is such as calcium, magnesium, sulfur and other fertilizers.

6) Fertilizers that are beneficial to certain crops: such as steel slag silicon fertilizer applied on rice, cobalt fertilizer applied on leguminous crops, and agricultural rare earths applied on sugarcane and fruits.