Phosphorus Fractions in Soil as an Influence of Rock Phosphate and Phosphate-Solubilizing Microorganisms

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Published: Oct 31, 2025
Keywords:
Phosphorus fraction Rock phosphate Phosphate-solubilizing microorganisms Acid sulfate soil

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Sanit Sawatdikarn
Faculty of Science and Technology, Phranakhon Si Ayutthaya Rajabhat University, Phra Nakhon Si Ayutthaya 13000
Saychol Sukyankij
Faculty of Science and Technology, Phranakhon Si Ayutthaya Rajabhat University, Phranakhon Si Ayutthaya 13000

Abstract

An important problem with acid sulfate soils (ASS) is that plant nutrients are present in unavailable forms, particularly phosphorus (P). This study aimed to investigate the effects of applying rock phosphate (RP)and phosphate-solubilizing microorganisms (PSMs) on available P and P fractions in ASS. The experiment was conducted using a completely randomized design (CRD) with three replicates and five treatments. The treatments were as follows: T1-no addition of RP and PSM (control), T2-addition of PSMs, T3-addition of RP at 100 g/pot (RP100), T4-addition of RP at 50 g/pot combined with PSMs (RP50+PSMs), and T5-addition of RP at 100g/pot combined with PSMs (RP100+PSMs).The findings revealed that the application of RP at 50 and 100g/pot (RP100,RP50+PSMs,RP100+PSMs) resulted in higher inorganic P, organic P, and residual P compared with the control and the treatment with PSMs alone. Regarding Kalmegh yield, there was no significant difference between RP50+PSMs and RP100+PSMs. However, the RP100+PSMs treatment provided the highest values of available P, soluble P, Fe-P, and Al-P. The results indicate that in ASS, the combined application of RP and PSMs is important for increasing soil P content, both in available forms (available P and soluble P) and in reserve forms (Fe-P and Al-P).

Article Details

Issue
Vol.33 No.5 (September-October2025)
Section
Biological Sciences

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