article · Frontiers in Plant Science
Researchers evaluated twenty-two nitrogen-fixing microbial strains isolated from Moroccan rhizospheric soils, representing genera such as Bacillus, Pseudomonas, Arthrobacter, Burkholderia, and a yeast-like organism, for their ability to promote plant growth. In wheat cultivation trials, inoculation with the yeast Rhodotorula mucilaginosa NF 516 and the bacterium Arthrobacter sp. NF 528, applied either alone or together, significantly enhanced plant growth and improved nitrogen and phosphorus uptake under reduced nitrogen regimes. The beneficial effects occurred in the presence of both natural rock phosphate and triple superphosphate, demonstrating microbial effectiveness under complex nutrient limitations. Inoculation with these strains demonstrated the potential to lower chemical nitrogen fertiliser requirements by up to 50 percent without reducing wheat yields, with biological nitrogen fixation fulfilling the remaining nitrogen needs required for optimal crop development.
Synthetic nitrogen fertilisers are costly and carry significant environmental footprints. By identifying native soil microorganisms that supply nitrogen naturally and improve phosphorus uptake, this work shows how biological solutions can support robust cereal yields while reducing reliance on chemical inputs, contributing directly to more sustainable and cost-effective farming systems.
This research could support the development of microbial biofertilisers for agricultural input manufacturers and cereal growers. The findings demonstrate applied, tested efficacy in wheat under varied nutrient conditions, indicating that while candidate strains are validated, further formulation and field-scale testing would be required to advance these bio-inoculants towards commercial readiness.
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Twenty-two nitrogen-fixing strains (<i>nif-H</i>+) were isolated from various Moroccan rhizospheric soils, representing <i>Bacillus</i> sp., <i>Pseudomonas</i> sp., <i>Arthrobacter</i> sp., <i>Burkholderia</i> sp. and a yeast-like microorganism. These strains were carefully selected based on their potential to promote plant growth. The findings revealed that the application of <i>Rhodotorula mucilaginosa</i> NF 516 and <i>Arthrobacter</i> sp. NF 528 individually or in combination, significantly improved wheat plant growth and enhanced nutrients (N and P) uptake under reduced nitrogen regimes. Notably, their effectiveness was evident in response to both natural rock phosphate and TSP, demonstrating their important role in wheat production under conditions of low nitrogen and complex phosphorus inputs. This research underscores the significant role of nitrogen-fixing microorganisms, particularly <i>Rhodotorula mucilaginosa</i> NF 516 and <i>Arthrobacter</i> sp. NF 528, in wheat production under conditions of low nitrogen and complex phosphorus inputs. It showcases their potential to reduce chemical nitrogen fertilization requirements by up to 50% without compromising wheat plant yields. Our study emphasizes the importance of bacterial biological nitrogen fixation in meeting the remaining nitrogen requirements beyond this reduction. This underscores the vital role of microbial contributions in providing essential nitrogen for optimal plant growth and highlights the significance of biological nitrogen fixation in sustainable agriculture practices.
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DOI: 10.3389/fpls.2024.1388775
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