| Title | Customized biochar for soil applications in arid land: Effect of feedstock type and pyrolysis temperature on soil microbial enumeration and respiration |
| Publication Type | Journal Article |
| Year of Publication | 2022 |
| Authors | Al-Rabaiai A., Menezes-Blackburn D., Al-Ismaily S., Janke R., Pracejus B., Al-Alawi A., Al-Kindi M., Bol R. |
| Journal | Journal of Analytical and Applied Pyrolysis |
| Volume | 168 |
| Pagination | 13 |
| Date Published | Nov |
| Type of Article | Article |
| ISBN Number | 0165-2370 |
| Accession Number | WOS:000861803700003 |
| Keywords | adsorption, Agriculture, Biochar pyrolysis, by-products, carbon stability, Chemistry, Energy & Fuels, Engineering, Feedstock quality, Mesquite trees, Organic waste, plant biomass, slow pyrolysis, sludge, soil health, surface-area, valorization |
| Abstract | Biochar is rapidly gaining worldwide interest as an agro-technology for increasing soil health and carbon storage. This study investigated the physicochemical characteristics and impact on soil microbes of biochar amendments from three feedstock sources: date palm leaves (D), mesquite plants (M) and sludge compost (S.C.); pyrolyzed at 450?, 600 ? and 750 ?. Scanning electron microscopy images showed an apparent pore size increase with increasing pyrolysis temperature. The increase in pyrolysis temperature decreased O-H and C-O bonds and increased the proportion of C-C bonds, as obtained from the Fourier transform infrared spectroscopy studies. Thermostability was highest at a pyrolysis temperature of 750 ?, with distinct thermal decomposition profiles for each of the three feedstock materials used, as indicated by the dynamic thermal gravimetric analysis. The SC biochars showed the highest mineral content (45-66%) with significantly higher water-soluble and total concentrations of mineral elements. The SC samples also showed the presence of possible soil contaminants such as Pb and As, and its use as a soil amendment is not recommended, even though the SC at 450 ? was the only nonalkaline biochar in this study. The M feedstock produced biochar with the highest surface area (600 m(2) g(-1)) and carbon content based on loss on ignition (94.98%); nevertheless, the M biochar reduced soil microbial enumeration and respiration. This reduction increased with increasing pyrolysis temperature. Therefore, the M biochar feedstocks are not recommended for improving soil health and may be tested in the future as a microbial inhibitor for soil-borne plant pathogens. Considering the physicochemical properties and the biochar impact on soil, D at 600 ? was the best biochar selected for further studies as a soil amendment. The large differences in biochar physicochemical properties and their effect on soil microbes observed in this study suggest that the feedstock type and pyrolysis temperatures must be considered during biochar amendment production for improving soil health in arid-land agroecosystems.
|
| Short Title | J. Anal. Appl. PyrolysisJ. Anal. Appl. Pyrolysis |
| Alternate Journal | J. Anal. Appl. Pyrolysis |
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Cited Reference Count: 99
Al-Rabaiai, Ahmed Menezes-Blackburn, Daniel Al-Ismaily, Said Janke, Rhonda Pracejus, Bernhard Al-Alawi, Ahmed Al-Kindi, Mohamed Bol, Roland
Sultan Qaboos University entitled: Integrating modern soil and water smart technologies for salinity management in the Sultanate of Oman; Sultan Qaboos University; His Majesty Fund [SR/AGR/SWAE/21/01]
This work was funded by a grant from Sultan Qaboos University entitled: Integrating modern soil and water smart technologies for salinity management in the Sultanate of Oman, His Majesty Fund (SR/AGR/SWAE/21/01) . The authors appreciate the additional in-kind support from SQU, Oman.
6
Elsevier
Amsterdam
1873-250x
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Menezes-Blackburn, D (corresponding author), Sultan Qaboos Univ, Dept Soils Water & Agr Engn, POB 34,Al Khoud 123, Muscat, Oman.
danielblac@squ.edu.om
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