Nitrogen, Phosphorus and Potassium are three major or primary nutrients that are to be made available in larger quantities. These three major elements are originally rich in the natural world, for instance 4/5 of the air is Nitrogen element. But high-class plants can't directly absorb gaseous Nitrogen. In nature only a few of microbes can convert gaseous nitrogen to ammoniac nitrogen that plant can easily absorb. Besides, the rich phosphorus and potassium minerals in the natural world that the plants can't directly take up also can be converted to soluble nutrients by only a few of microbes, too. These three microbes are the nitrogen-fixing bacteria, phosphate-decomposing bacteria and potassium-decomposing bacteria.

Shanghai Yuyuan's nitrogen-fixing bacteria are bacillus asotofixans, excreting multi-vitamins and growth nutrients during its overall growth, such as hexamethylene hydroxyketone, nicotinamide acid and pantothenic acid that plants can directly absorb.

The bacillus megatherium var.phosphaticum i n the microbial fertilizers, with the biggest number in quantity and the most effective in function, are the major bacteria to release phosphorus in paddy fields. They ferment in carriers of humic acid and the quick-acting phosphorus rises by 30% in carriers.

The bacillus mucilaginosus in the microbial fertilizers, mixing with phosphate bacteria into soil, produce organic acid and carbonic acid for growth, thereupon to speed up the separation of phosphorite and other minerals and then the soluble phosphorus and potassium in soils increase.

Through the growth activities and by means of taking up air and water in soil, the nitrogen-fixing bacteria in microbial fertilizers boast azotification, while the phosphorus and potassium bacteria release the concretion of phosphorus and potassium from soil and convert to soluble nutrients so that plants can absorb. Moreover, the growth irritant and antibiotic cultivated from bacteria multiply can enhance the plant growth and induce resistance from pests and disease, improve the physical and chemical properties of the soil.

The composite microbes coming from these three well-fermented bacteria can be absorbed by organic nutrients, such as protein, lightweight calcium carbonate, humic acid, clay, livestock manure and microelements. Then these organic fertilizers can be added into inorganic fertilizers according different proportion to produce multi-effect, compound fertilizers by appearance of powder or granule.