Abstract
Chemical fertilizers can supply essential nutrients to crops increasing their yield, however, they can also cause serious environmental problems. Biofertilizer has received more and more attention because of its environmentally friendly and pollution-free characteristics. Haloxylon ammodendron, a desert succulent shrub, has become an important plant species for vegetation restoration in several deserts in China because of its strong drought tolerance. Its extensive root systems and unique rhizosphere bacterial community aid H. ammodendron adapt to this extreme environment. In this study, Bacillus sp. WM13-24 and Pseudomonas sp. M30-35 isolated from the rhizosphere of H. ammodendron in our previous study and Bacillus amyloliquefaciens GB03 and Sinorhizobium meliloti ACCC17578 as well-studied beneficial strains were used to prepare two types of biofertilizer, WM13-24 biofertilizer containing Bacillus sp. WM13-24 and integrated biofertilizer containing all the four strains. Results presented here showed that WM13-24 biofertilizer and the integrated biofertilizer improved chili plant growth, fruit yield and quality and the rhizosphere soil nitrogen content, enzyme activities, and the quantity and biodiversity of viable bacteria. Compared to the control, WM13-24 biofertilizer and a commercial biofertilizer, the integrated biofertilizer performed best in significantly increasing plant height, stem diameter, leaf length and width, chlorophyll content, fruit yield, soluble sugar content, ascorbic acid content, organic acid content, soil urease activity, catalase activity and the quantity and biodiversity of viable bacteria. This study provided a theoretical and practical basis for large scale development of integrated biofertilizers using beneficial rhizobacterial strains from the desert plant rhizosphere.
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Acknowledgements
Prof. Suo-Min Wang from Lanzhou University is appreciated for his advice and laboratory support upon this work. This work was financially supported by the National Key Research and Development Program of China (Grant No. 2019YFC0507703 and 2017YFC0504802), the National Natural Science Foundation of China (Grant No. 31222053), the Science and Technology Support Program of Gansu Province, China (Grant No. 1604NKCA077).
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Gou, JY., Suo, SZ., Shao, KZ. et al. Biofertilizers with beneficial rhizobacteria improved plant growth and yield in chili (Capsicum annuum L.). World J Microbiol Biotechnol 36, 86 (2020). https://doi.org/10.1007/s11274-020-02863-w
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DOI: https://doi.org/10.1007/s11274-020-02863-w