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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 oxalic acid on (a) root length, (b) root surface, and (c) Root volume. Bars indicate standard error, n = 5.
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fig6: Effect of oxalic acid on (a) root length, (b) root surface, and (c) Root volume. Bars indicate standard error, n = 5.

Mentions: Root development in aerobic rice was influenced by the application of organic acids, PSB, and PR. The highest root length, surface area, and root volume were found in treatments with organic acids, PR, and PSB16 inoculations (Figures 6 and 7). Among both acids, oxalic acid produced higher root growth. Significantly (P < 0.05) higher root length (7.64 cm), root surface area (2.36 cm2) and root volume (0.11 cm3) were found in oxalic acid at 20 mM with PR and PSB16 inoculated treatments (Figures 6 and 7). External application of organic acids along with PSB enhanced soluble P in the solution and this had a positive impact on root growth.


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 oxalic acid on (a) root length, (b) root surface, and (c) Root volume. Bars indicate standard error, n = 5.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

fig6: Effect of oxalic acid on (a) root length, (b) root surface, and (c) Root volume. Bars indicate standard error, n = 5.
Mentions: Root development in aerobic rice was influenced by the application of organic acids, PSB, and PR. The highest root length, surface area, and root volume were found in treatments with organic acids, PR, and PSB16 inoculations (Figures 6 and 7). Among both acids, oxalic acid produced higher root growth. Significantly (P < 0.05) higher root length (7.64 cm), root surface area (2.36 cm2) and root volume (0.11 cm3) were found in oxalic acid at 20 mM with PR and PSB16 inoculated treatments (Figures 6 and 7). External application of organic acids along with PSB enhanced soluble P in the solution and this had a positive impact on root growth.

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