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This is an early access version, the complete PDF, HTML, and XML versions will be available soon.
Article

Effect of K-Solubilizing Purple Nonsulfur Bacteria on Soil K Content, Plant K Uptake, and Yield of Hybrid Maize Grown on Alluvial Soil in a Dyke Area in Field Conditions

by
Nguyen Quoc Khuong
1,
Ly Kim Quyen
1,
Tran Trong Khoi Nguyen
1,
Nguyen Duc Trong
1,
Le Thi My Thu
1,
Vo Yen Ngoc
1,
Le Thanh Quang
1,
La Cao Thang
1 and
Pham Thi Phuong Thao
2,*
1
Faculty of Crop Science, College of Agriculture, Can Tho University, Can Tho 94000, Vietnam
2
Faculty of Physiology-Biochemistry, College of Agriculture, Can Tho University, Can Tho 94000, Vietnam
*
Author to whom correspondence should be addressed.
Appl. Microbiol. 2025, 5(4), 137; https://doi.org/10.3390/applmicrobiol5040137
Submission received: 26 October 2025 / Revised: 19 November 2025 / Accepted: 25 November 2025 / Published: 26 November 2025
Versions Notes

Abstract

Microorganisms are considered a potential source of biofertilizers for mobilizing nutrients from insoluble mineral potassium (K). This study was conducted to evaluate the effects of liquid potassium-solubilizing bacteria, Cereibacter sphaeroides M-Sl-09, Rhodopseudomonas thermotolerans M-So-11, and Rhodopseudomonas palustris M-So-14 (LPS-PNSB), on soil K content, plant K uptake, growth, and yield of hybrid maize cultivated on alluvial soil in the dyke-protected area of An Phu, An Giang, Vietnam. Results showed that the application of LPS-PNSB significantly improved exchangeable soil K from 0.428 to 0.460–0.470 meq 100 g−1, total plant K uptake from 181.5 to 205.8–259.4 kg ha−1, and yield from 11.1 to 12.2–12.6 ton ha−1, compared with the recommended 100% NPK fertilization. The addition of LPS-PNSB allowed a 100% reduction in K fertilizer compared with the recommended rate while still maintaining yield. Hybrid maize grain yield further increased when 100% recommended K was applied in combination with LPS-PNSB, surpassing the yield obtained with 100% K alone.
Keywords: Cereibacter sp.; exchangeable potassium; potassium uptake; potassium-solubilizing bacteria; Rhodopseudomonas spp. Cereibacter sp.; exchangeable potassium; potassium uptake; potassium-solubilizing bacteria; Rhodopseudomonas spp.

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MDPI and ACS Style

Khuong, N.Q.; Quyen, L.K.; Nguyen, T.T.K.; Trong, N.D.; Thu, L.T.M.; Ngoc, V.Y.; Quang, L.T.; Thang, L.C.; Thao, P.T.P. Effect of K-Solubilizing Purple Nonsulfur Bacteria on Soil K Content, Plant K Uptake, and Yield of Hybrid Maize Grown on Alluvial Soil in a Dyke Area in Field Conditions. Appl. Microbiol. 2025, 5, 137. https://doi.org/10.3390/applmicrobiol5040137

AMA Style

Khuong NQ, Quyen LK, Nguyen TTK, Trong ND, Thu LTM, Ngoc VY, Quang LT, Thang LC, Thao PTP. Effect of K-Solubilizing Purple Nonsulfur Bacteria on Soil K Content, Plant K Uptake, and Yield of Hybrid Maize Grown on Alluvial Soil in a Dyke Area in Field Conditions. Applied Microbiology. 2025; 5(4):137. https://doi.org/10.3390/applmicrobiol5040137

Chicago/Turabian Style

Khuong, Nguyen Quoc, Ly Kim Quyen, Tran Trong Khoi Nguyen, Nguyen Duc Trong, Le Thi My Thu, Vo Yen Ngoc, Le Thanh Quang, La Cao Thang, and Pham Thi Phuong Thao. 2025. "Effect of K-Solubilizing Purple Nonsulfur Bacteria on Soil K Content, Plant K Uptake, and Yield of Hybrid Maize Grown on Alluvial Soil in a Dyke Area in Field Conditions" Applied Microbiology 5, no. 4: 137. https://doi.org/10.3390/applmicrobiol5040137

APA Style

Khuong, N. Q., Quyen, L. K., Nguyen, T. T. K., Trong, N. D., Thu, L. T. M., Ngoc, V. Y., Quang, L. T., Thang, L. C., & Thao, P. T. P. (2025). Effect of K-Solubilizing Purple Nonsulfur Bacteria on Soil K Content, Plant K Uptake, and Yield of Hybrid Maize Grown on Alluvial Soil in a Dyke Area in Field Conditions. Applied Microbiology, 5(4), 137. https://doi.org/10.3390/applmicrobiol5040137

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