Iranian researchers at Shahroud University have deactivated bacteria, producing a type of biological fertilizer 100 gram of which can replace 70-100 kg of chemical fertilizer.
"The fertilizer is composed of an efficient material and a carrier," Director of the Project Rahim Nosrati told the Iranian students' news agency.
The bacteria used in the biological fertilizer include calcium phosphate found in the soil and cannot be absorbed by the plant. The fertilizer changes it to an absorbent phosphate and makes nitrogen absorbable by the plant.
The combinations of the carrier make bacteria inactive. The bacteria duplicate when they are added to soil. The soluble and absorbable phosphorus is released and nitrogen is stabled for the plant.
He added that the biological fertilizer does not include harmful materials found in chemical types including phosphorus and nitrogen.
The biological fertilizer is carrying useful bacteria not damaging the environment.