Journal
CHEMOSPHERE
Volume 78, Issue 1, Pages 13-21Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2009.09.059
Keywords
Compost; P forms; P-31 NMR spectroscopy; NIR spectroscopy; Multivariate calibration
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Funding
- Ministerio de Educacion y Ciencia of Spain [CICYT CFM2006-01363/TECNO, MTM200761554]
- University of Alicante [UAUST107-02]
- Generalitat Valenciana [GVPRE/2008/208]
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The content and chemical forms of P in compost are essential variables for its proper management with an agricultural purpose, especially considering the increasing P over-fertilization in agrosystems. In this study, the estimation of P content and dynamics in different composting scenarios was developed using near infrared reflectance spectroscopy (NIRS) coupled with a statistical tool for calibration, a penalized signal regression. Samples were analyzed on total P and partitioned using NaOH-solution P-31 NMR spectroscopy quantifying pyrophosphate, orthophosphate, orthophosphate diesters, phospholipids, and orthophosphate monoesters pools. According to the results obtained, total P content (r(2) = 0.99 and root mean square error of cross-validation = 0.53) and P forms can be estimated during composting using NIRS, as well as in the mature product, orthophosphate and orthophosphate monoesters being the most abundant P forms throughout the experiment. Penalized signal regression allows detecting the significant wavenumbers in each composting period, and also with the different P pools in the composting pile depending on time. (C) 2009 Elsevier Ltd. All rights reserved.
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