Phosphate-solubilizing biofertilizers contain microorganisms that have the capacity to solubilize phosphorus from insoluble forms in the soil, making it more readily available for plant absorption. Examples of these microorganisms include certain bacteria and fungi. A key nutrient for plant growth and development, phosphorus is essential for activities including DNA synthesis and energy transfer. But a large portion of the phosphorus in the soil is there in forms that plants cannot utilise.
Phosphate-solubilizing biofertilizers function as follows:
Organic acid secretion: Organic acids, such as citric acid, gluconic acid, and oxalic acid, are released into the soil by phosphate-solubilizing microbes. The chemical connections between phosphorus and other elements found in soil minerals, such as calcium, iron, and aluminum, can be broken down by these organic acids.
Phosphate solubilization: As the organic acids interact with the phosphorus-bound compounds, they attach to the metal ions that surround the phosphate molecules and chelate them, thus releasing phosphorus into the soil solution. Insoluble forms of phosphorus, such as calcium phosphate and iron phosphate, are changed into soluble forms, mostly orthophosphate (H2PO4- and HPO42-), through this process.
Plant uptake: Plant roots may easily absorb phosphorus once it has been solubilized and added to the soil solution. The soluble phosphorus is subsequently moved through the tissues of the roots and used by the plant for a number of metabolic processes.
greater plant growth: Phosphate-solubilizing biofertilizers encourage greater plant growth, root development, blooming, and fruiting by making phosphorus more readily available, which is a limiting nutrient in many soils.
