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- Title
Potential of endophytic phosphorus-solubilizing bacteria to improve soil fertility, P uptake, and yield of maize (Zea mays L.) cultivated in alluvial soil in dikes in Vietnam.
- Authors
Nguyen Quoc Khuong; Le Thanh Quang; Le Vinh Thuc; Tran Ngoc Huu; Le Thi My Thu; Tran Thi Bich Van; Do Thi Xuan; Nguyen Hong Hue; Nguyen Thi Thai Le; Pham Duy Tien; Tran Chi Nhan; Ly Ngoc Thanh Xuan; Nguyen Thi Thanh Xuan
- Abstract
This study aimed to (i) select endophytic bacteria in maize root for its phosphorus solubilization ability and (ii) evaluate the efficacy of selected indigenous bacterial strains on soil fertility, phosphorus (P) uptake, growth, and maize yield. A total of 31 maize root samples were collected from An Phu District, An Giang Province, to isolate the bacteria. In addition, the pot experiment was conducted with nine treatments of (i) 100% P of the recommended fertilizer formula (RFF), (ii) 75% P of the RFF, (iii) 50% P of the RFF, (iv) 25% P of the RFF, (v) 75% P of the RFF plus a mixture of the 3 selected strains, (vi) 50% P of the RFF plus a mixture of the 3 selected strains, (vii) 25% P of the RFF plus a mixture of the 3 selected strains, (viii) 0% P of the RFF plus a mixture of the 3 selected strains, and (ix) 0% P of the RFF plus none of the 3 selected strains. The results identified 72 isolates from LGI medium. All isolates were screened in a broth medium at pH 5.0, but only 16 isolates obtained OD660 > 0.5. All 16 isolates were able to solubilize various insoluble P fractions. Of those, strain ASD-21 had the highest P solubilization ability for the insoluble Al-P compound. Strains ASD-08 and ASD-21 had the highest Fe-P concentration at 39.8-41.5 mg P L-1. Strains ASD-08 and ASD-21 had the highest Ca-P concentration (46.6-51.3 mg P L-1) for 48 h of incubation. They were identified as Enterobacter spp. Results also showed the application of a mixture of strains ASD-08, ASD-10, and ASD-21 increased soil fertility by increasing phosphorus content by 13.7 mg P kg-1 and replacing 25% of P fertilizer, but this mixture did not change maize yield.
- Subjects
VIETNAM; SOIL fertility; ENDOPHYTIC bacteria; SOIL microbiology; FLUVISOLS; PLANT growth promoting substances; CORN; SOLUBILIZATION; ENTEROBACTER
- Publication
Bulgarian Journal of Agricultural Science, 2022, Vol 28, Issue 2, p217
- ISSN
1310-0351
- Publication type
Article