*Amonette, J.E., and S. Joseph. 2009. Characteristics of Biochar: Microchemical Properties. In Biochar for Environmental Management: Science and Technology, ed. J. Lehmann, and S.Joseph, 33–52. London: Earthscan.
*Baldock, J.A., and R.J. Smernik. 2002. Chemical composition and bioavailability of thermally altered Pinus resinosa (red pine) wood. Organic Geochemistry 33: 1093–1109.
*Bourke, J., M. Manley-Harris, C. Fushimi, K. Dowaki, T. Nunoura,
and M.J. Antal Jr. 2007. Do all carbonized charcoals have the same chemical structure? 2. A model of the chemical structure of carbonized charcoal. Industrial and Engineering Chemistry Research 46: 5954–5967.
*Bruun, S., S.L. Harmer, G. Bekiaris, W. Christel, L. Zuin, Y. Hu, L.S. Jensen, and E. Lobi. 2017. The effect of different pyrolysis temperatures on the speciation and availability in soil of P in biochar produced from the solid fraction of manure. Chemosphere 169: 377–386.
*Chan, K.Y., and Z. Xu. 2009. Biochar: Nutrient properties and their enhancement. In Biochar for Environmental Management: Science and Technology, ed. J. Lehmann, and S. Joseph, 67–84. London: Earthscan.
*Degenstein, J.C., P. Murria, M. Easton, H. Sheng, M. Hurt, A.R. Dow, J. Gao, J.J. Nash, et al. 2015. Fast pyrolysis of 13C-labeled cellobioses: Gaining insights into the mechanisms of fast pyrolysis of carbohydrates. Journal of Organic Chemistry 80:1909–1914.
*Demirbas, A. 2004. Effects of temperature and particle size on biochar yield from pyrolysis of agricultural residues. Journal of Analytical and Applied Pyrolysis 72: 243–248.
*Gao, H., C. Zhou, R. Wang, and X. Li. 2015. Comparison and
evaluation of co-composting corn stalk or rice husk with swine waste in China. Waste and Biomass Valorization 6: 699–710.
*Hesterberg, D., W. Zhou, K.J. Huchison, S. Beauchemin, and D.E. Sayers. 1999. XAFS study of adsorbed and mineral forms of phosphate. Journal of Synchrotron Radiation 6: 636–638.
Hesterberg, D. 2010. Macroscale chemical properties and X-ray absorption spectroscopy of soil phosphorus. In Synchrotron-Based Techniques in Soils and Sediments. Developments in Soil Science, 34th ed, ed. B. Singh, and M. Grafe, 1–480. Amsterdam: Elsevier.
*Hossain, M.K., V. Strezov, K.Y. Chan, A. Ziolkowski, and P.F. Nelson. 2011. Influence of pyrolysis temperature on production and nutrient properties of wastewater sludge biochar. Journal of Environmental Management 92: 223–228.
*Hu, Y.F., I. Coulthard, D. Chevrier, G. Wright, R. Igarashi, A. Sitnikov, B.W. Yates, E.L. Hallin, et al. 2010. Preliminary commissioning and performance of the soft X-ray microcharacterization beamline at the Canadian Light Source. AIP Conference Proceedings 1234: 343–346.
*Huang, R., and Y. Tang. 2015. Speciation dynamics of phosphorus during (hydro)thermal treatments of sewage sludge. Environmental Science and Technology 49: 14466–14474.
*Hussain, M., M. Farooq, A. Nawaz, A.M. Al-Sadi, Z.M. Solaiman, S.S. Alghamdi, U. Ammara, Y.S. Ok, et al. 2016. Biochar for crop production: Potential benefits and risks. Journal of Soils and Sediments. https://doi.org/10.1007/s11368-016-1360-2.
*Ingall, E.D., J.A. Brandes, J.M. Diaz, M.D. De Jonge, D. Paterson, I. McNulty, W.C. Elliott, and P. Northrup. 2011. Phosphorus K edge XANES spectroscopy of mineral standards. Journal of Synchrotron Radiation 18: 189–197.
*Jarvie, H.P., A.N. Sharpley, D. Flaten, P.J.A. Kleinman, A. Jenkins, and T. Simmons. 2015. The pivotal role of phosphorus in a resilient water-energy-food security nexus. Journal of Environmental Quality 44: 1049–1062.
*Keiluweit, M., P.S. Nico, M.G. Johnson, and M. Kleber. 2010. Dynamic molecular structure of plant biomass-derived black carbon (biochar). Environmental Science and Technology 44: 1247–1253.
*Kruse, J., W. Negassa, N. Appathurai, L. Zuin, and P. Leinweber. 2010. Phosphorus speciation in sequentially extracted agroindustrial byproducts: Evidence from X-ray absorption near edge structure spectroscopy. Journal of Environmental Quality 39: 2179–2184.
*Le Corre, K.S., E. Valsami-Jones, P. Hobbs, and S.A. Parsons. 2009. Phosphorus recovery from wastewater by struvite crystallization: A review. Critical Reviews in Environmental Science and Technology 39: 433–477.
*Leinweber, P. 1996. Phosphorus fractions in soils from an area with high density of livestock population. Zeitschrift fu¨r Pflanzenerna¨hrung und Bodenkunde 159: 251–256.
*Lu, H., W. Zhang, S. Wang, L. Zhuang, Y. Yang, and R. Qiu. 2013. Characterization of sewage sludge-derived biochars from different feedstocks and pyrolysis temperatures. Journal of Analytical and Applied Pyrolysis 102: 137–143.
*Mehta, C.M., W.O. Khunjar, V. Nguyen, S. Tait, and D.J. Batstone. 2015. Technologies to recover nutrients from waste streams: A critical review. Critical Reviews in Environmental Science and Technology 45: 385–427.
*Morales, M.M., N. Comerford, I.A. Guerrini, N.P.S. Falcao, and J.B. Reeves. 2013. Sorption and desorption of phosphate on biochar and biochar–soil mixtures. Soil Use Manage 29: 306–314.
*Negassa, W., J. Kruse, D. Michalik, N. Appathurai, L. Zuin, and P. Leinweber. 2010. Phosphorus speciation in agro-industrial byproducts: Sequential fractionation, solution 31P NMR, and P K-and L2,3-edge XANES spectroscopy. Environmental Science and Technology 44: 2092–2097.
*Oenema, O., W. Chardon, P. Ehlert, K. van Dijk, and O. Schoumans. 2012. Phosphorus fertilizers from by-products and wastes. In Proceedings 717, International Fertilizer Society. Leek, U.K.
*Pan, H., and B.W. Darvell. 2010. Effect of carbonate on hydroxyapatite solubility. Crystal Growth & Design 10: 845–850.
*Peak, D., J.T. Sims, and D.L. Sparks. 2002. Solid-state speciation of natural and alum-amended poultry litter using XANES spectroscopy. Environmental Science and Technology 36: 4253–4261.
*Prietzel, J., G. Harrington, W. Ha¨usler, K. Heister, F. Werner, and W. Klysubum. 2016. Reference spectra of important adsorbed organic and inorganic phosphate binding form for soil P speciation using synchrotron-based K-edge XANES spectroscopy. Journal of Synchrotron Radiation 23: 532–544.
*Ravel, B., and M. Newville. 2005. ATHENA and ARTEMIS:
Interactive graphical data analysis using IFEFFIT. Physica
Scripta T115: 1007–1010.
*Schroder, J. 2005. Revisiting the agronomic benefits of manure: A correct assessment and exploitation of its fertilizer value spares the environment. Bioresource Technology 6: 253–261.
*Shaltout, A.A., M.A. Allam, and M.A. Moharram. 2011. FTIR
spectroscopic, thermal and XRD characterization of hydroxyapatite from new natural sources. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 83: 56–60.
*Shober, A.L., D.L. Hesterberg, J.T. Sims, and S. Gardner. 2006. Characterization of phosphorus species in biosolids and manures using XANES spectroscopy. Journal of Environmental Quality 35: 1983–1993.
*Toor, G.S., S. Hunger, J.D. Peak, J.T. Sims, and D.L. Sparks. 2006. Advances in the characterization of phosphorus in organic wastes: Environmental and agronomic applications. Advances in Agronomy 89: 1–72.
*Uchimiya, M. 2014. Changes in nutrient content and availability during the slow pyrolysis of animal wastes. In Applied manure and nutrient chemistry for sustainable agriculture and environment, ed. Z. He, and H. Zhang, 53–68. New York: Springer.
*Uchimiya, M., and S. Hiradate. 2014. Pyrolysis temperature-dependent changes in dissolved phosphorus speciation of plant and manure biochars. Journal of Agricultural and Food Chemistry 62: 1802–1809.
*Verheijen, F., S. Jeffery, A.C. Bastos, M. van der Velde, and I. Diafas. 2010. Biochar application to soils. A critical scientific review of effects on soil properties, processes, and functions. Luxembourg: Office for the Official Publications of the European Communities.
*Wang, T., M. Camps-Arbestain, M. Hedley, and P. Bishop. 2012. Predicting phosphorus bioavailability from high-ash biochars. Plant and Soil 357: 173–187.
*Wang, T., M. Camps-Arbestain, and M. Hedley. 2014. The fate of phosphorus of ash-rich biochars in a soil-plant system. Plant and Soil 375: 61–74.
*Weiner, S., and P.M. Dove. 2003. An overview of biomineralization processes and the problem of the vital effect. Reviews in Mineralogy and Geochemistry. https://doi.org/10.2113/0540001.
*Withers, P.J.A., K.C. van Dijk, T.S.S. Neset, T. Nesme, O. Oenema, G.H. Rubaek, O.F. Schoumans, B. Smit, et al. 2015. Stewardship to tackle global phosphorus inefficiency: The case of Europe. Ambio 44: 193–206.
*Zhang, Q., H. Liu, W. Li, J. Xu, and Q. Liang. 2012. Behaviour of phosphorus during co-gasification of sewage sludge and coal. Energy & Fuels 26: 2830–2836.
*Zheng, H., Z. Wang, X. Deng, J. Zhao, Y. Luo, J. Novak, S. Herbert, and B. Xing. 2013. Characteristics and nutrient values of biochars produced from giant reed at different temperatures. Bioresource Technology 130: 463–471.
*Zwetsloot, M.J., J. Lehmann, and D. Solomon. 2014. Recycling slaughterhouse waste into fertilizer: How do pyrolysis temperature and biomass additions affect phosphorus availability and chemistry? Journal of the Science of Food and Agriculture 95: 281–288.