Straw biochar increases the abundance of inorganic phosphate solubilizing bacterial community for better rape (Brassica napus) growth and phosphate uptake

• Published in: The Science of the total environment 2019-01, Vol.647, p.1113-1120
• Main Authors: Zheng, Bang-Xiao, Ding, Kai, Yang, Xiao-Ru, Wadaan, Mohammed A.M., Hozzein, Wael N., Peñuelas, Josep, Zhu, Yong-Guan
• Format: Article
• Language: English
• Subjects: Brassica napus; Brassica napus - physiology; Charcoal - chemistry; Inorganic phosphate solubilizing bacteria; Phosphate uptake; Phosphates - chemistry; Phosphates - metabolism; Phosphorus; Soil; Soil Microbiology; Soil Pollutants - chemistry; Soil Pollutants - metabolism; Straw biochar
• ISSN: 0048-9697; 1879-1026
• DOI: 10.1016/j.scitotenv.2018.07.454

The direct application of inorganic-phosphate-solubilizing bacteria (iPSBs) for improving the efficiency of phosphorus (P) use leads to a low rate of bacterial survival. Biochar is a good inoculum carrier for microbial survival, and diverse feedstocks can have different effects. We generated an iPSB community using seven selected iPSB strains with various phylogenic taxonomies and P-solubilizing abilities. Biochar was then inoculated with the iPSB community and applied to soil in pots seeded with rape (Brassica napus). Growth of the rape for four weeks and the effects of biochars produced from six raw feedstocks, rice straw, rice husks, soybean straw, peanut shells, corn cobs and wood, were compared. The synthetic iPSB community had a larger capacity to solubilize inorganic P and exude organic anions than any of the individual strains. The structure of the iPSB community was analyzed by high-throughput sequencing four weeks after inoculation. All seven iPSB strains were detected, dominated by Arthrobacter defluvii 06-OD12. The abundance of the iPSB community was significantly correlated with rape biomass, P content and P uptake (P