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<p>The application potential of the biochar enriched with insoluble calcium and phosphorus crystal was limited as a fertilizer. In this study, a composite material B@PM was prepared by loading <i>Paenibacillus mucilaginosus</i>, one of the commonly used typical silicate bacteria, on the calcium and phosphorus modified biochar BCEKH. It was also observed through XRD data that <i>Paenibacillus mucilaginosus</i> can effectively dissolve pyrophosphate crystals, such as Ca<sub>2</sub>P<sub>2</sub>O<sub>7</sub> and K<sub>2</sub>CaP<sub>2</sub>O<sub>7</sub>. The release behaviors of phosphate, K and Ca from B@PM were diffusive and dissolved, which conformed to the Power function and Parabolic diffusion models, respectively. The potting experiment showed that the root length (30.77%), leaf width (71.67%), and plant height (81.08%) of Chinese cabbage were increased after the application of B@PM, as well as the organic matter, available phosphorus, available potassium, and total calcium in the soil. In addition, the abundance of the <i>Proteobacteria</i>, <i>Actinobacteria</i>, <i>Bacteroidetes</i> and <i>Firmicutes</i> in the rhizosphere soil was increased during the planting. The activities of catalase and alkaline phosphatase were increased by 82.84% and 39.64%, respectively. RDA analysis showed that these microorganisms were greatly correlated with environmental factors in the rhizosphere soil, such as OM, URE, EC, TCa, AK, CAT, AP and ALP. (In this experiment, soil organic matter (OM), adequate phosphorus (AP), quick-acting potassium (AK) and total calcium (TCa) concentrations were all measured using a soil nutrient tachometer (YT-TRB, Shandong Yuntang Intelligent Technology Co.). The activities of soil urease (URE), catalase (CAT) and alkaline phosphatase (ALP) were determined using soil enzyme activity kits (A121-1–1\T005\T010, Nanjing Jiancheng Bioengineering Research Institute). This work demonstrated that the combination of <i>Paenibacillus mucilaginosus</i> and biochar can effectively improve the utilization efficiency of insoluble minerals that were produced during the phosphorus-containing waste treatment as slow-release fertilizer.</p>

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Enhanced Nutrient Release and Microbial Activity: Assessment of Ca-P mineral enriched biochar loaded with Paenibacillus mucilaginosus

  • 期刊论文

  • 发表日期：

    2025年5月29日

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  • Yanjiao Qi,
  • Jiazhi Gao,
  • Shen Yang,
  • Qian Li,
  • Linshan Wang,
  • Bo Zhang,
  • Yidan Duan,
  • Huining Lu,
  • Lan Wu,
  • Hong Zhang,
  • Yamin Zhao

摘要

The application potential of the biochar enriched with insoluble calcium and phosphorus crystal was limited as a fertilizer. In this study, a composite material B@PM was prepared by loading Paenibacillus mucilaginosus, one of the commonly used typical silicate bacteria, on the calcium and phosphorus modified biochar BCEKH. It was also observed through XRD data that Paenibacillus mucilaginosus can effectively dissolve pyrophosphate crystals, such as Ca2P2O7 and K2CaP2O7. The release behaviors of phosphate, K and Ca from B@PM were diffusive and dissolved, which conformed to the Power function and Parabolic diffusion models, respectively. The potting experiment showed that the root length (30.77%), leaf width (71.67%), and plant height (81.08%) of Chinese cabbage were increased after the application of B@PM, as well as the organic matter, available phosphorus, available potassium, and total calcium in the soil. In addition, the abundance of the Proteobacteria, Actinobacteria, Bacteroidetes and Firmicutes in the rhizosphere soil was increased during the planting. The activities of catalase and alkaline phosphatase were increased by 82.84% and 39.64%, respectively. RDA analysis showed that these microorganisms were greatly correlated with environmental factors in the rhizosphere soil, such as OM, URE, EC, TCa, AK, CAT, AP and ALP. (In this experiment, soil organic matter (OM), adequate phosphorus (AP), quick-acting potassium (AK) and total calcium (TCa) concentrations were all measured using a soil nutrient tachometer (YT-TRB, Shandong Yuntang Intelligent Technology Co.). The activities of soil urease (URE), catalase (CAT) and alkaline phosphatase (ALP) were determined using soil enzyme activity kits (A121-1–1\T005\T010, Nanjing Jiancheng Bioengineering Research Institute). This work demonstrated that the combination of Paenibacillus mucilaginosus and biochar can effectively improve the utilization efficiency of insoluble minerals that were produced during the phosphorus-containing waste treatment as slow-release fertilizer.