Biofertilizers are microorganisms that can be used to improve soil fertility and crop yields. Here are a few examples of biofertilizers that can be used in farming:

• Nitrogen-fixing bacteria: Nitrogen-fixing bacteria, such as Rhizobia and Azotobacter, can convert atmospheric nitrogen into a form that can be used by plants. These bacteria can be applied to the seed or soil and can be used to improve crop yields and soil health.
• Phosphorus-solubilizing bacteria: Phosphorus-solubilizing bacteria, such as Pseudomonas and Bacillus, can solubilize insoluble phosphates in the soil, making them available for plant uptake. These bacteria can improve crop yields, particularly in low-phosphorus soils.
• Potassium-solubilizing bacteria: Potassium-solubilizing bacteria, such as Bacillus and Streptomyces, can solubilize insoluble potassium in the soil, making it available for plant uptake. These bacteria can improve crop yields, particularly in low-potassium soils.
• Mycorrhizal fungi: Mycorrhizal fungi, such as Glomus and Pisolithus, form mutualistic relationships with plants, helping them to absorb nutrients and water. These fungi can improve crop yields, particularly in nutrient-poor soils.
• Bio-pesticide-producing bacteria: Some bacteria like Bacillus thuringiensis and Bacillus subtilis can produce bio-pesticides, which can help control pests and diseases in crops.
• Bio-stimulant-producing bacteria: Some bacteria like Bacillus methylotrophicus and Bacillus amyloliquefaciens can produce bio-stimulants, which can help improve crop growth and increase yields.
• Microorganisms for soil health: Some microorganisms like Trichoderma, Pseudomonas, and Mycorrhizal fungi can improve soil health by decomposing organic matter, suppressing pathogens, and promoting nutrient cycling.

These are just a few examples of the many types of biofertilizers that can be used in farming. The specific biofertilizers that are best suited for a particular crop or soil will depend on the specific conditions of the farm and the crop being grown.