Agronomic characterization of anaerobic digestates with near-infrared spectroscopy

Zennaro, Bastien; Marchand, Paul; Latrille, Éric; Thoisy, Jeanne-Chantal; Houot, Sabine; Girardin, Cyril; Steyer, Jean‐Philippe; Béline, Fabrice; Charnier, Cyrille; Richard, Charlotte; Accarion, Guillaume; Jimenez, Julie

doi:10.1016/j.jenvman.2022.115393

Cited by 5 publications

(1 citation statement)

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“…In contrast, near infrared reflectance spectroscopy (NIRS) is a sensitive, fast and non-destructive analytical technique and may be a potential solution for fast and cheap chemical and biochemical characterization of materials ( Galvez-Sola et al., 2010a ; Peltre et al., 2011 ; Viaene et al., 2017 ). NIRS has been reported as a fast method of screening of chemical and biochemical properties during the composting process ( Galvez-Sola et al., 2010b ; Viaene et al., 2017 ), screening of chemical composition of compost or digestate products ( Galvez-Sola et al., 2010a ; Peltre et al., 2011 ; Zennaro et al., 2022 ) and determination of humic acids in composts ( Meissl et al., 2008 ). NIRS has potential for predicting chemical parameters and phytotoxicity of peats and peat-based growing media ( Ludwig et al., 2006 ; Terhoeven-Urselmans et al., 2008 ) as well as for determining the degree of maturity and biological stability of composts ( Lohr et al., 2016 ; Erhart et al., 2017 ).…”

Section: Introductionmentioning

confidence: 99%

Fast screening of total nutrient contents in strawberry leaves and spent growing media using NIRS

Vandecasteele,

Van Waes

2023

Front. Plant Sci.

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IntroductionIn closed-loop soilless cultivation, the main nutrient sinks are nutrients retained either by the crop or in spent growing media. Measurement of nutrients in spent growing media and in the aboveground vegetative plant biomass at crop termination can be a tool for assessing and optimizing nutrient efficiency. The first aim of this study was to test the potential of near-infrared reflectance spectroscopy (NIRS) to forecast the various nutrient contents in strawberry leaves, which would then allow for assessment of crop nutrient status and total nutrient uptake by strawberry plants. The second aim was to test NIRS as a high throughput technique for assessing the N, K, Ca, Mg and organic matter (OM) content and the pH, EC and C:N and C:P ratios for a dataset of composts, plant fibers and spent growing media. The NIRS prediction model for fast screening of the total nutrient contents in spent growing media was compared with a single extraction method.MethodsA database with 369 dried and ground strawberry leaf samples with known contents of N, P, K, Ca, and Mg were scanned using NIRS. The database covered a range of leaf contents of 6-35 g N/kg dry matter (DM), 0.7-6.3 g P/kg DM and 2-29 g K/kg DM. A dataset of 458 samples of different types of materials used in growing media was validated with a dataset of 109 samples.ResultsValidation for the strawberry leaves indicated potential for this application, with R2 values of 0.90 or higher for N, K and Ca, and R2 values higher than 0.85 for P and Mg. Validation for the dataset of composts, plant fibers and spent growing media also indicated the potential for this application, with R2 values of 0.90 or higher for organic matter, and with R2 values of 0.85 or higher for total Ca, pH and C:N. A first test indicated potential for the calibration based on fresh samples of compost, plant fiber as well as spent growing media or dried (not ground) samples.DiscussionUse of NIRS on fresh samples would eliminate the need for drying and grinding the samples and would reduce screening time. The ammonium acetate extraction is a reliable alternative to NIRS for fast screening of the total P, K, Ca, and Mg contents in composts, plant fibers and spent growing media.

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