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Identification of potential phosphate-solubilizing bacteria across different levels of humic acid application under sweet corn cultivation |
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| รหัสดีโอไอ | |
| Creator | Phrueksa Lawongsa |
| Title | Identification of potential phosphate-solubilizing bacteria across different levels of humic acid application under sweet corn cultivation |
| Contributor | Mona Ayu Santi, Saowalak Somboon, Tanabhat-Sakorn Sukitprapanon |
| Publisher | Faculty of Agriculture |
| Publication Year | 2567 |
| Journal Title | Khon Kaen Agriculture Journal |
| Journal Vol. | 52 |
| Journal No. | 5 |
| Page no. | 1006-1020 |
| Keyword | humic acid, phosphate-solubilizing bacteria, organic amendment, bacterial population, sweet corn rhizosphere |
| URL Website | https://li01.tci-thaijo.org/index.php/agkasetkaj |
| Website title | Khon Kaen Agriculture Journal |
| ISSN | 3027-6497 (Online) |
| Abstract | Phosphate-solubilizing bacteria (PSB) plays a crucial role in enhancing phosphorus availability to plants, thereby promoting plant growth and productivity in agricultural ecosystems. Given the inherent challenges of low soil fertility, organic matter deficiency, and phosphorus fixation in northeastern Thailand's soil, organic fertilizers such as humic acid (HA) offer a promising avenue for enhancing soil health and productivity. Therefore, further investigation into the direct effects of humic acid on PSB is considered crucial, particularly to determine the optimal application rates that can stimulate PSB efficiency in soil. This study aims to assess the influence of different concentrations of humic acid on the population of PSB and identify the potential PSB isolates from distinct HA application rates. The pot experiment was conducted using a completely randomized design with six treatments: T1 (control), T2 (chemical fertilizer), T3 (HA 0.5%), T4 (HA 1%), T5 (HA 1.5%), and T6 (HA 2%). The initial soil (O1) was also assessed. We uncovered that the highest PSB population was observed with a 1.5% HA treatment, presenting a 40% increase compared to the control. This suggests that a 1.5% HA concentration is the most favorable for increasing the PSB populations, while higher concentrations may not provide additional benefits and might potentially lead to adverse effects on the bacterial population. Soluble P content in broth culture medium was analyzed during a 9-day period with 3-day interval measurements. The five potential PSB isolates were chosen and identified as Priestia megaterium, Bacillus subtilis, Priestia aryabhattai, Bacillus sp., and Mycolicibacterium sp. The strongest solubilizing ability was observed from Priestia megaterium and Bacillus sp., with soluble P concentrations of approximately ยฑ 607 mg Lโ'1 and ยฑ 601 mg Lโ'1, respectively, on day 6. This study provides comprehensive knowledge regarding the potential PSB community isolated from various HA treatments and suggests their potential for further biofertilizer application as plant growth-promoting rhizobacteria. |
