Abstract

The reaction mechanisms of phosphate-bearing mineral phases from sewage sludge ash-based fertilizers in soil were determined by Raman and synchrotron infrared microspectroscopy. Different reaction mechanisms in wet soil were found for calcium and magnesium (pyro-) phosphates. Calcium orthophosphates were converted over time to hydroxyapatite. Conversely, different magnesium phosphates were transformed to trimagnesium phosphate. Since the magnesium phosphates are unable to form an apatite structure, the plant-available phosphorus remains in the soil, leading to better growth results observed in agricultural pot experiments. The pyrophosphates also reacted very differently. Calcium pyrophosphate is unreactive in soil. In contrast, magnesium pyrophosphate quickly formed plant-available dimagnesium phosphate.

Accurate and rapid detection of soil and fertilizer properties based on visible/near-infrared spectroscopy

Zhidan Lin, Rujing Wang, Yubing Wang, Liusan Wang, Cuiping Lu, Yang Liu, Zhengyong Zhang, and Likai Zhu
Appl. Opt. 57(18) D69-D73 (2018)

Laser-induced breakdown spectroscopy and digital image data fusion for determination of the Al, Ca, Fe, Mg, and P in mineral fertilizer: overcome matrix effects in solid direct analysis

Diego Victor Babos, Jéssica Franciele Kaminski Ramos, Gabriel Carlos Francisco, Vinícius de Melo Benites, and Débora Marcondes Bastos Pereira Milori
J. Opt. Soc. Am. B 40(3) 654-660 (2023)

Infrared Microspectroscopy. II*

Elkan R. Blout and George R. Bird
J. Opt. Soc. Am. 41(8) 547-551 (1951)

High-sensitivity determination of available cobalt in soil using laser-induced breakdown spectroscopy assisted with laser-induced fluorescence

Ran Zhou, Ke Liu, Zhiyang Tang, Peiyuan Gao, Jiujiang Yan, and Xiangyou Li
Appl. Opt. 60(29) 9062-9066 (2021)

Synchrotron Radiation as an Infrared Source

James R. Stevenson, H. Ellis, and Roger Bartlett
Appl. Opt. 12(12) 2884-2889 (1973)