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Application of potential phosphate-solubilizing bacteria and organic acids on phosphate solubilization from phosphate rock in aerobic rice.

Panhwar QA, Jusop S, Naher UA, Othman R, Razi MI - ScientificWorldJournal (2013)

Bottom Line: The results of the study showed significantly high P solubilization in PSB with organic acid treatments.Among the two organic acids, oxalic acid was found more effective compared to malic acid.A higher bacterial population was found in rhizosphere (8.78 log10 cfu g(-1)) compared to the nonrhizosphere and endosphere regions.

View Article: PubMed Central - PubMed

Affiliation: Department of Land Management, Faculty of Agriculture, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia.

ABSTRACT
A study was conducted at Universiti Putra Malaysia to determine the effect of phosphate-solubilizing bacteria (PSB) and organic acids (oxalic & malic) on phosphate (P) solubilization from phosphate rock (PR) and growth of aerobic rice. Four rates of each organic acid (0, 10, 20, and 30 mM), and PSB strain (Bacillus sp.) were applied to aerobic rice. Total bacterial populations, amount of P solubilization, P uptake, soil pH, and root morphology were determined. The results of the study showed significantly high P solubilization in PSB with organic acid treatments. Among the two organic acids, oxalic acid was found more effective compared to malic acid. Application of oxalic acid at 20 mM along with PSB16 significantly increased soluble soil P (28.39 mg kg(-1)), plant P uptake (0.78 P pot(-1)), and plant biomass (33.26 mg). Addition of organic acids with PSB and PR had no influence on soil pH during the planting period. A higher bacterial population was found in rhizosphere (8.78 log10 cfu g(-1)) compared to the nonrhizosphere and endosphere regions. The application of organic acids along with PSB enhanced soluble P in the soil solution, improved root growth, and increased plant biomass of aerobic rice seedlings without affecting soil pH.

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Related in: MedlinePlus

Effect of organic acids on PSB16 population, (a) oxalic acid without PR, (b) oxalic acid with PR, (c) malic acid without PR, (d) malic acid with PR. Bars indicate standard error, n = 5.
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fig2: Effect of organic acids on PSB16 population, (a) oxalic acid without PR, (b) oxalic acid with PR, (c) malic acid without PR, (d) malic acid with PR. Bars indicate standard error, n = 5.

Mentions: The addition of organic acids influenced the bacterial population. Significantly (P < 0.05) higher populations were found in the rhizosphere (8.78 log10 cfu g−1), while lower populations were found in nonrhizosphere soils (5.40 log10 cfu g−1). The highest rhizosphere population (8.65 log10 cfu g−1) was found in the 30 mM oxalic acid treatment (Figures 2(a) and 2(b)). In the case of malic acid, a significantly higher population was found in the rhizosphere at 30 mM acid without PR treatment (8.78 log10 cfu g−1), whereas, in nonrhizosphere soil the highest population was recorded at 10 mM acid without PR (6.54 log10 cfu g−1). However, the endosphere population was not influenced by the addition of organic acids (Figures 2(c) and 2(d)). Solubilization of P by PSB in the rhizosphere is a continuous process. The addition of organic acids had a positive influence on the PSB16 population. A higher population was found with the addition of organic acids combined with PR. The changes in PSB population occurred mostly in the nonrhizosphere region, and it becomes lower with the addition of oxalic acid treatments.


Application of potential phosphate-solubilizing bacteria and organic acids on phosphate solubilization from phosphate rock in aerobic rice.

Panhwar QA, Jusop S, Naher UA, Othman R, Razi MI - ScientificWorldJournal (2013)

Effect of organic acids on PSB16 population, (a) oxalic acid without PR, (b) oxalic acid with PR, (c) malic acid without PR, (d) malic acid with PR. Bars indicate standard error, n = 5.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3814071&req=5

fig2: Effect of organic acids on PSB16 population, (a) oxalic acid without PR, (b) oxalic acid with PR, (c) malic acid without PR, (d) malic acid with PR. Bars indicate standard error, n = 5.
Mentions: The addition of organic acids influenced the bacterial population. Significantly (P < 0.05) higher populations were found in the rhizosphere (8.78 log10 cfu g−1), while lower populations were found in nonrhizosphere soils (5.40 log10 cfu g−1). The highest rhizosphere population (8.65 log10 cfu g−1) was found in the 30 mM oxalic acid treatment (Figures 2(a) and 2(b)). In the case of malic acid, a significantly higher population was found in the rhizosphere at 30 mM acid without PR treatment (8.78 log10 cfu g−1), whereas, in nonrhizosphere soil the highest population was recorded at 10 mM acid without PR (6.54 log10 cfu g−1). However, the endosphere population was not influenced by the addition of organic acids (Figures 2(c) and 2(d)). Solubilization of P by PSB in the rhizosphere is a continuous process. The addition of organic acids had a positive influence on the PSB16 population. A higher population was found with the addition of organic acids combined with PR. The changes in PSB population occurred mostly in the nonrhizosphere region, and it becomes lower with the addition of oxalic acid treatments.

Bottom Line: The results of the study showed significantly high P solubilization in PSB with organic acid treatments.Among the two organic acids, oxalic acid was found more effective compared to malic acid.A higher bacterial population was found in rhizosphere (8.78 log10 cfu g(-1)) compared to the nonrhizosphere and endosphere regions.

View Article: PubMed Central - PubMed

Affiliation: Department of Land Management, Faculty of Agriculture, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia.

ABSTRACT
A study was conducted at Universiti Putra Malaysia to determine the effect of phosphate-solubilizing bacteria (PSB) and organic acids (oxalic & malic) on phosphate (P) solubilization from phosphate rock (PR) and growth of aerobic rice. Four rates of each organic acid (0, 10, 20, and 30 mM), and PSB strain (Bacillus sp.) were applied to aerobic rice. Total bacterial populations, amount of P solubilization, P uptake, soil pH, and root morphology were determined. The results of the study showed significantly high P solubilization in PSB with organic acid treatments. Among the two organic acids, oxalic acid was found more effective compared to malic acid. Application of oxalic acid at 20 mM along with PSB16 significantly increased soluble soil P (28.39 mg kg(-1)), plant P uptake (0.78 P pot(-1)), and plant biomass (33.26 mg). Addition of organic acids with PSB and PR had no influence on soil pH during the planting period. A higher bacterial population was found in rhizosphere (8.78 log10 cfu g(-1)) compared to the nonrhizosphere and endosphere regions. The application of organic acids along with PSB enhanced soluble P in the soil solution, improved root growth, and increased plant biomass of aerobic rice seedlings without affecting soil pH.

Show MeSH
Related in: MedlinePlus