Abstract
Low soil phosphate availability is a major constraint for soil fertility in the tropics. Phosphate ions are either adsorbed onto the surface of soil minerals or precipitated by free aluminum and iron ions in acidic soils. In highly weathered soils, this is so intense that plant crops commonly exhibit phosphate deficiency. To overcome this problem, high rates of soluble phosphate fertilizers can be employed to increase the concentration of phosphate in soil solution. Nonetheless, the large quantity of phosphate required in these soils makes it an unviable solution to most farmers in poor developed countries of the tropics. One alternative is to use locally available rock phosphates that are cheaper than soluble phosphate fertilizers. However, the low solubility of rock phosphate limits their agronomic effectiveness in increasing plant phosphate and growth. An alternative means of improving plant phosphate uptake is the combined use of phosphate solubilizing microorganisms (PSMs) and arbuscular mycorrhizal fungi (AMF). The first group of soil microorganisms can enhance the dissolution of rock phosphate via the release of organic acids. The latter group of microorganisms forms symbiotic associations with plant roots and take up phosphate from the soil solution more efficiently than the unaided roots. Once the phosphate is absorbed by the mycorrhizal hyphae, it is delivered into the root tissue. In this text, I will illustrate the mechanisms and synergistic effects that they exhibited to improve plant phosphate uptake and growth.
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Osorio, N.W. (2011). Effectiveness of Phosphate Solubilizing Microorganism in Increasing Plant Phosphate Uptake and Growth in Tropical Soils. In: Maheshwari, D. (eds) Bacteria in Agrobiology: Plant Nutrient Management. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-21061-7_4
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