Biogas potential from forbs and grass-clover mixture with the application of near infrared spectroscopy

Wahid, Radziah; Ward, Alastair James; Møller, Henrik Bjarne; Søegaard, Karen; Eriksen, Jørgen

doi:10.1016/j.biortech.2015.08.154

Cited by 20 publications

(20 citation statements)

References 24 publications

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“…In order to improve the economic sustainability of anaerobic digestion of green manure, the amount of harvested biomass should be maximized (Tersbøl and Malm 2013). Inclusion of forbs increases the aboveground productivity of grass-clover mixtures, thus increasing the energy yield (Cong et al 2017).…”

Section: Introductionmentioning

confidence: 99%

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Nitrogen fertilizer replacement value of digestates from three green manures

Notaris

Sørensen

Møller

et al. 2018

Nutr Cycl Agroecosyst

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Green manure mixtures including legumes and forbs can help to increase N availability in organic arable systems. Anaerobic digestion of green manures may provide ammonium rich digestate, which can be redistributed as fertilizer. The aim of this study was to investigate the effect of plant species composition, cutting strategy and anaerobic digestion on the N fertilizer replacement value (NFRV) of different green manures. Digestates obtained from silages of pure stand lucerne (four cuts/year) and a mixture including lucerne, grass and forbs (two or four cuts/year) were used to fertilize winter wheat (surface banding) and spring barley (injection). In general, NFRV was 46-173% higher in spring barley than winter wheat, due to the different application method and timing, which reflect the common practices in Denmark. NFRV of digestates were 25-63% higher than the corresponding silages, with the largest increase with the most fibrous material (mixture at two cuts/year).Total N concentration (DM based) in the silages largely explained NFRV of the digestates. To obtain NFRV above 60%, total N concentration of silage should exceed 3.5 g 100 g -1 DM, achievable with silages from four-cut strategies. Silages of plant materials with different composition and N content may be similar in terms of biomethane production, but the fertilizer value of the digestates varies considerably depending on total N concentration.

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Section: Introductionmentioning

confidence: 99%

“…In addition, pollinators also benefit from a reduced cutting frequency (Potts et al 2009). Performing fewer cuts per year would also decrease management costs, with effects on the initial quality of the material but no significant reduction in the biogas yield (Wahid et al 2015).…”

Section: Introductionmentioning

confidence: 99%

Nitrogen fertilizer replacement value of digestates from three green manures

Notaris

Sørensen

Møller

et al. 2018

Nutr Cycl Agroecosyst

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“…Recently, Near-Infrared spectroscopy analysis has been extensively studied for measurement of water content. NIR spectroscopy is frequently used for rapid and reliable prediction of quality parameters in plant, food, animal, and pharmacy (Prevolnik et al, 2011; Lin et al, 2014; Aernouts et al, 2015; Wahid et al, 2015). Lin et al (2014) successfully developed four calibration models of grain protein content (GPC) in barley, which could be applied to quality control in malting, feed processing, and breeding selection.…”

Section: Introductionmentioning

confidence: 99%

Determination of Leaf Water Content by Visible and Near-Infrared Spectrometry and Multivariate Calibration in Miscanthus

Jin

Shi

et al. 2017

Front. Plant Sci.

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Leaf water content is one of the most common physiological parameters limiting efficiency of photosynthesis and biomass productivity in plants including Miscanthus. Therefore, it is of great significance to determine or predict the water content quickly and non-destructively. In this study, we explored the relationship between leaf water content and diffuse reflectance spectra in Miscanthus. Three multivariate calibrations including partial least squares (PLS), least squares support vector machine regression (LSSVR), and radial basis function (RBF) neural network (NN) were developed for the models of leaf water content determination. The non-linear models including RBF_LSSVR and RBF_NN showed higher accuracy than the PLS and Lin_LSSVR models. Moreover, 75 sensitive wavelengths were identified to be closely associated with the leaf water content in Miscanthus. The RBF_LSSVR and RBF_NN models for predicting leaf water content, based on 75 characteristic wavelengths, obtained the high determination coefficients of 0.9838 and 0.9899, respectively. The results indicated the non-linear models were more accurate than the linear models using both wavelength intervals. These results demonstrated that visible and near-infrared (VIS/NIR) spectroscopy combined with RBF_LSSVR or RBF_NN is a useful, non-destructive tool for determinations of the leaf water content in Miscanthus, and thus very helpful for development of drought-resistant varieties in Miscanthus.

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“…Bioenergy production was then estimated by calculating the net energy balance, i.e., subtracting total energy input from methane energy output related to the whole production process. Methane energy output was calculated based on the harvested biomass and previously determined specific methane yields of grass-clover mixture and pure stands of chicory, caraway and plantain 26 . Energy input related to each of above-mentioned operational steps was calculated by employing field measured data or country-specific values 27, 28 where possible; otherwise the IPCC 29 default values were used.…”

Section: Methodsmentioning

confidence: 99%

Forbs enhance productivity of unfertilised grass-clover leys and support low-carbon bioenergy

Cong

Jing

Rasmussen

et al. 2017

Sci Rep

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Intensively managed grasslands are dominated by highly productive grass-clover mixtures. Increasing crop diversity by inclusion of competitive forbs may enhance biomass production and sustainable biofuel production. Here we examined if one or all of three forbs (chicory, Cichorium intybus L.; caraway, Carum carvi L.; plantain, Plantago lanceolata L.) included in ryegrass-red clover mixtures enhanced above- and below-ground productivity, and assessed their biofuel potentials, based on a three-year experiment with and without fertilisation as cattle slurry. We determined herbage yield, standing root biomass, and estimated methane energy output and greenhouse gas (GHG) emissions per energy unit using life cycle assessment. Results showed that plantain-containing grass-clover mixtures significantly increased herbage yield, while chicory- or caraway-containing mixtures maintained similar yields to the grass-clover mixture. Standing root biomass of the grass-clover mixture was enhanced by inclusion of caraway and plantain, with that of plantain further enhanced by fertilisation. The highest methane energy output was achieved in plantain-containing grass-clover mixtures. All unfertilised mixtures achieved the 60% reduction in GHG emissions compared to fossil fuel, whereas all fertilised mixtures did not meet the 60% reduction target. These findings suggest that including competitive forbs such as plantain in grass-clover mixtures enhances productivity, supporting low-carbon footprint bioenergy production.

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Biogas potential from forbs and grass-clover mixture with the application of near infrared spectroscopy

Cited by 20 publications

References 24 publications

Nitrogen fertilizer replacement value of digestates from three green manures

Nitrogen fertilizer replacement value of digestates from three green manures

Determination of Leaf Water Content by Visible and Near-Infrared Spectrometry and Multivariate Calibration in Miscanthus

Forbs enhance productivity of unfertilised grass-clover leys and support low-carbon bioenergy

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