References of "Bodson, Bernard"
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See detailSensitive parameters in local agricultural life cycle assessments: the illustrative case of cereal production in Wallonia, Belgium
van Stappen, Florence; Mathot, Michael; Loriers, Astrid et al

in International Journal of Life Cycle Assessment (in press)

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See detailA push–pull strategy to control aphids combines intercropping with semiochemical releases
Xu, Qingxuan ULiege; Hatt, Séverin ULiege; Chevalier Mendes Lopes, Thomas ULiege et al

in Journal of Pest Science (in press)

Even if insect pest populations can be reduced by increasing plant diversity through intercropping, natural enemies are not always favored in such systems. Alternatively, semiochemical substances have ... [more ▼]

Even if insect pest populations can be reduced by increasing plant diversity through intercropping, natural enemies are not always favored in such systems. Alternatively, semiochemical substances have been tested to enhance biological control, with inconsistent results. Combining both strategies can be an interesting way to maximize pest control. In this work, a 2-year setup involving wheat–pea strip intercropping combined with the release of E-b-farnesene (EBF) or methyl salicylate (MeSA) was tested as a push–pull strategy to simultaneously repel aphids and attract beneficials. Two types of slow-release formulation (i.e., oil and alginate beads) containing EBF or MeSA were deployed with the intercropping. The abundance of aphids was significantly decreased, while hoverfly larvae and mummified aphids increased on both pea plants and wheat tillers by the release of oil-formulated EBF and MeSA. The proportion parasitism of the aphid-parasitism rate [mummies/(aphids + mummies)] was also increased by treating both crops in both years. Releasing EBF through oil rather than alginate beads proved significantly better for attracting natural enemies and reducing aphids. Aphids were negatively correlated with the density of hoverflies (both adults and larvae) and numbers of mummies. All these results showed that combining intercropping with the release of EBF or MeSA formulated in oil can significantly reduce aphid density and attract their natural enemies. Therefore, the combination of both strategies could help farmers reduce the use of insecticides. [less ▲]

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See detailRotational and continuous grazing does not affect the total net ecosystem exchange of a pasture grazed by cattle but modifies CO2 exchange dynamics
Gourlez de la Motte, Louis ULiege; Mamadou, Ossenatou; Beckers, Yves ULiege et al

in Agriculture, Ecosystems & Environment (2018), 253

Grassland carbon budgets are known to be greatly dependent on management. In particular, grazing is known to directly affect CO2 exchange through consumption by plants, cattle respiration, natural ... [more ▼]

Grassland carbon budgets are known to be greatly dependent on management. In particular, grazing is known to directly affect CO2 exchange through consumption by plants, cattle respiration, natural fertilisation through excreta, and soil compaction. This study investigates the impact of two grazing methods on the net ecosystem exchange (NEE) dynamics and carbon balance, by measuring CO2 fluxes using eddy covariance in two adjacent pastures located in southern Belgium during a complete grazing season. Rotational (RG) grazing consists of an alternation of rest periods and short high stock density grazing periods. Continuous grazing (CG) consists of uninterrupted grazing with variable stocking rates. To our knowledge, this is the first study to assess the impact of these grazing methods on total net ecosystem exchange and CO2 exchange dynamics using eddy covariance. The results showed that NEE dynamics were greatly impacted by the grazing method. Following grazing events on the RG parcel, net CO2 uptake on the RG parcel was reduced compared to the CG parcel. During the following rest periods, this phenomenon progressively shifted towards a higher assimilation for the RG treatment. This behaviour was attributed to sharp biomass changes in the RG treatment and therefore sharp changes in plant photosynthetic capacity. We found that differences in gross primary productivity at high radiation were strongly correlated to differences in standing biomass. In terms of carbon budgets, no significant difference was observed between the two treatments, neither in cumulative NEE, or in terms of estimated biomass production. The results of our study suggest that we should not expect major benefits in terms of CO2 uptake from rotational grazing management when compared to continuous grazing management in intensively managed temperate pastures. [less ▲]

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See detailUtilisation de l'imagerie hyperspectrale proche infrarouge dans l'étude de systèmes racinaires
Eylenbosch, Damien ULiege; Fernández Pierna, Juan Antonio; Baeten, Vincent et al

Conference (2018, January 25)

Lors d’études de systèmes racinaires sur base de prélèvements de carottes de sol, le tri manuel des racines et des résidus de cultures, récupérés après le lavage des échantillons, afin de les quantifier ... [more ▼]

Lors d’études de systèmes racinaires sur base de prélèvements de carottes de sol, le tri manuel des racines et des résidus de cultures, récupérés après le lavage des échantillons, afin de les quantifier, est une étape fastidieuse. Pour faciliter et accélérer cette étape, nous avons mis au point une méthode de discrimination de ces éléments sur base d’images prises en proche infrarouge. Les échantillons lavés et séchés sont passés sous une caméra qui enregistre, pour chaque pixel de l’image, un spectre en proche infrarouge. Ces spectres sont liés à la nature physico-chimique des éléments présents sur l’image et ils sont analysés à l’aide d’algorithmes d’analyses discriminantes qui permettent de les classer et donc de prédire la nature de chaque pixel de l’image. Sur base du nombre de pixels prédits comme étant des racines ou des résidus de culture, et grâce à des droites de régression reliant le nombre de pixels prédits pour ces éléments à une masse connue, nous pouvons finalement quantifier ces éléments au sein d’échantillons de sol. Cette méthode a été testée avec succès en froment et a permis de mettre très clairement en évidence l’effet du travail du sol sur le développement du système racinaire. Elle a également été utilisée sur des échantillons de sol prélevés sous des cultures associées de froment et de pois afin de distinguer et quantifier les racines des 2 espèces et les nodosités. [less ▲]

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See detailDéveloppement d’un système d’aide à la décision multicritère pour l’optimisation de la fertilisation azotée
Dumont, Benjamin ULiege; Basso, Bruno; Destain, Jean-Pierre ULiege et al

in Gate, Philippe (Ed.) Phloème : 1ères biennales de l’innovation céréalière (2018, January)

Since 2002, the Sustainable Nitrogen Management Program (PGDA), which is the transposition of the Nitrate Directive 91/676/EEC in Wallonia (Be), has defined "good agricultural practices" to reduce ... [more ▼]

Since 2002, the Sustainable Nitrogen Management Program (PGDA), which is the transposition of the Nitrate Directive 91/676/EEC in Wallonia (Be), has defined "good agricultural practices" to reduce detrimental environmental impacts while maintaining farmers and crop productivity. However, optimizing fertilization management remains complex, since the effects of application are temporally separated from the moment of their application. This research aims to develop a decision support tool (DSS) to optimize N fertilization of winter wheat (Triticum aestivum L.), meeting both productivity criteria and PGDA requirements. The STICS soil-crop model (INRA, France) has been used to study the effects N management, soil and climate conditions on wheat growth. The tool developed for the management and optimization of N consists of a stochastic study where agronomic (yields) and environmental outputs (soil N content) are simulated under a wide range of fertilization levels and climatic conditions (derived here from LARS-WG - Rothamsted, UK). Finally, decision rules, integrating agronomic, economic and environmental criteria have been defined, to objectify the optimization of N. On this basis, a DSS has been developed allowing strategic or tactical management of fertilization. The results obtained suggest that, 75% of the time, 15 to 35 kgN. ha-1, could be saved on the fraction of N usually brought to the Zadok 39 stage, respectively based on economic or environmental considerations. [less ▲]

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See detailEtude de l’influence de la fertilisation azotée sur le développement racinaire du froment d’hiver (Triticum aestivum L.)
Eylenbosch, Damien ULiege; Fernández Pierna, Juan Antonio; Baeten, Vincent et al

Poster (2018, January)

Le poster présente les premiers résultats obtenus dans un essai sur l'effet de fertilisation azotée sur le système racinaire du froment d'hiver. La quantification des racines a été réalisée sur base d ... [more ▼]

Le poster présente les premiers résultats obtenus dans un essai sur l'effet de fertilisation azotée sur le système racinaire du froment d'hiver. La quantification des racines a été réalisée sur base d'échantillons de sol analysés, après lavage, par imagerie hyperspectrale proche infrarouge. Cette méthode d'analyse de prélèvements racinaires permet de quantifier les racines sans devoir les séparer préalablement des résidus de culture présents dans les échantillons de sol et sans devoir les peser. Pour le prélèvement racinaire réalisé au stade redressement de la culture de froment, aucun effet de la fertilisation azotée apportée au stade tallage n'a pu être mis en évidence. Une diminution de la densité racinaire sur les 90 cm de sol étudiés a par contre été clairement mesurée. [less ▲]

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See detailUtilisation de l’imagerie hyperspectrale proche infrarouge combinée aux outils de la chimiométrie dans l’étude de systèmes racinaires.
Eylenbosch, Damien ULiege; Fernández Pierna, Juan Antonio; Baeten, Vincent et al

in Recueil de communications (2018, January)

In studies on root systems using the soil coring method, roots, crop residues and soil particles extracted after washing of soil samples need to be manually sorted before root quantification. If different ... [more ▼]

In studies on root systems using the soil coring method, roots, crop residues and soil particles extracted after washing of soil samples need to be manually sorted before root quantification. If different species are present in the sample, their discrimination is based on several criteria. In order to reduce the complexity and the time needed for this tedious sorting step, near infrared hyperspectral imaging was used to discriminate all these elements. Images of washed and dried samples were acquired with a camera saving, for each pixel, a near infrared spectrum. These spectra are linked to the physicochemical nature of the elements visible on the hyperspectral images and were analyzed with discriminant algorithms allowing their discrimination and to link each pixel spectrum to the nature of the elements. According to the number of pixels classified as roots and thanks to the linear relationship between the number of pixels and the root biomass in the sample, it was possible to quantify roots in soil samples without manual sorting and weighing. This methodology was successfully tested on winter wheat roots and highlighted the tillage effect on root system development. It was also tested on wheat-pea intercropping in order to quantify separately the roots of each species. [less ▲]

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See detailShort-Term Effects of Tillage Practices and Crop Residue Exportation on Soil Organic Matter and Earthworm Communities in Silt Loam Arable Soil
Lemtiri, Aboulkacem ULiege; Colinet, Gilles ULiege; Alabi, Taofic ULiege et al

in Angeles Munoz, Maria; Zornoza, Raul (Eds.) SOIL MANAGEMENT AND CLIMATE CHANGE : EFFECTS ON ORGANIC CARBON, NITROGEN DYNAMICS, AND GREENHOUSE GAS EMISSIONS (2018)

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See detailSowing flower strips in a wheat field to enhance biological control of aphids and support pollinators
Amy, Clara ULiege; Brigode, Mélanie ULiege; Hatt, Séverin ULiege et al

Poster (2017, November 14)

Insect pests are responsible, among other factors, for reducing the productivity of crops. While chemical insecticides used to control them cause harmful effects on human health and the environment ... [more ▼]

Insect pests are responsible, among other factors, for reducing the productivity of crops. While chemical insecticides used to control them cause harmful effects on human health and the environment, conservation biological control, i.e. managing habitats in agricultural landscapes to support pest natural enemies, turns out to be a promising approach. Moreover, the decline of pollinators in agricultural areas is observed since a few decades, being partly due to the intensification of agriculture which homogenizes and degrades agricultural landscape. To reduce the detrimental effects of agricultural intensification on biodiversity, ecosystem functioning and ecosystem services, farmers have the opportunity to adopt agri-environmental measures. Among them, the establishment of flower strips, with a recognized interest in biological control and the conservation of pollinators, is proposed. However, their establishment is not systematically efficient and profitable for the farmers. Adapting mixture composition to farmer’s need may encourage their adoption. Thus, the research project has a double goals (i) to provide intercropping flower strips for promoting the attraction of beneficial insects against pests and for promoting pollinators diversity; and (ii) to suggests diversification of farm income by planting monospecific oilseed flower strips. [less ▲]

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See detailNIR hyperspectral imaging spectroscopy and chemometrics for the discrimination of roots and crop residues extracted from soil samples
Eylenbosch, Damien ULiege; Bodson, Bernard ULiege; Baeten, Vincent et al

in Journal of Chemometrics (2017)

Roots play a major role in plant development. Their study in field conditions is important to identify suitable soil management practices for sustainable crop productions. Soil coring, which is a common ... [more ▼]

Roots play a major role in plant development. Their study in field conditions is important to identify suitable soil management practices for sustainable crop productions. Soil coring, which is a common method in root production measurement, is limited in sampling frequency due to the hand‐sorting step. This step, needed to sort roots from other elements extracted from soil cores like crop residues, is time consuming, tedious, and vulnerable to operator ability and subjectivity. To get rid of the cumbersome hand‐sorting step, avoid confusion between these elements, and reduce the time needed to quantify roots, a new procedure, based on near‐infrared hyperspectral imaging spectroscopy and chemometrics, has been proposed. It was tested to discriminate roots of winter wheat (Triticum aestivum L.) from crop residues and soil particles. Two algorithms (support vector machine and partial least squares discriminant analysis) have been compared for discrimination analysis. Models constructed with both algorithms allowed the discrimination of roots from other elements, but the best results were reached with models based on support vector machine. The ways to validate models, with selected spectra or with hyperspectral images, provided different kinds of information but were complementary. This new procedure of root discrimination is a first step before root quantification in soil samples with near‐infrared hyperspectral imaging. The results indicate that the methodology could be an interesting tool to improve the understanding of the effect of tillage or fertilization, for example, on root system development. [less ▲]

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See detail5. Froment 2017: une récolte hâtive et étalée avec une qualité moyenne
Sinnaeve, Georges; Gofflot, Sébastien; Chandelier, Anne et al

in Bodson, Bernard; Watillon, Bernard (Eds.) Livre Blanc Céréales (2017, September 14)

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See detail2. Variétés
Meza Morales, Walter ULiege; Jacquemin, Guillaume; Dumont, Benjamin ULiege et al

in Bodson, Bernard; Watillon, Bernard (Eds.) Livre Blanc Céréales (2017, September 14)

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See detail1. Implantation des cultures
Eylenbosch, Damien ULiege; Meza Morales, Walter ULiege; Monfort, Bruno et al

in Bodson, Bernard; Watillon, Bernard (Eds.) Livre Blanc Céréales (2017, September 14)

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See detailLivre Blanc Céréales
Bodson, Bernard ULiege; Watillon, Bernard

Book published by Gembloux Agro Bio Tech (2017)

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See detailVariétés - 1. Froment d'hiver
Meza Morales, Walter ULiege; Dumont, Benjamin ULiege; Jacquemin, Guillaume et al

in Watillon, Bernard; Bodson, Bernard (Eds.) Livre Blanc Céréales (2017, September)

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See detailImpact of tillage on greenhouse gas emissions by a maize crop and dynamics of N2O fluxes.
Lognoul, Margaux ULiege; Theodorakopoulos, Nicolas; Hiel, Marie-Pierre ULiege et al

Conference (2017, July)

N2O is a potent greenhouse gas produced by nitrifying and denitrifying microorganisms. In agricultural soils, the uppermost soil layer constitutes the main source of N2O emissions, which are driven by ... [more ▼]

N2O is a potent greenhouse gas produced by nitrifying and denitrifying microorganisms. In agricultural soils, the uppermost soil layer constitutes the main source of N2O emissions, which are driven by climatic events such as precipitations, but also by soil properties such as N and C availability. Farming practices like tillage can influence these soil properties and consequently affect greenhouse gas emissions. Between June and October 2015, CO2 and N2O fluxes were measured on a maize crop located in Gembloux (Belgium), using a homemade automated set of dynamic closed chambers. Two tillage treatments were compared: reduced tillage and conventional tillage, both applied since 2008. A significant impact of tillage was observed on GHG emissions: mean emissions were twice larger (CO2) and six times larger (N2O) under reduced tillage than in conventional tillage, presumably because of higher total organic C and total N content, and greater microbial biomass in the upper soil layer. An emission peak of N2O was observed in both treatments mid-June less than 24h after heavy precipitations. The absence of peak later during the experiment was attributed to maize growth and competition for soil N. In reduced tillage, soil temperature explained ~10% of N2O background flux variability, but no significant relationship was found for conventional tillage. No clear pattern (e.g. daily cycle) was identified in N2O background fluxes. Our results highlight the need for continuous measurements as peaks can happen several months after fertilization, and the need for high temporal resolution measurements to understand the dynamics behind N2O emissions. [less ▲]

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See detailQuantification of roots by the use of NIR hyperspectral imaging and chemometrics
Eylenbosch, Damien ULiege; Baeten, Vincent; Bodson, Bernard ULiege et al

Conference (2017, June)

Estimation of root system development is often based on the soil coring method which allows repeated measurements during the growing season in the field as well as in different soil horizons. However ... [more ▼]

Estimation of root system development is often based on the soil coring method which allows repeated measurements during the growing season in the field as well as in different soil horizons. However, this method is limited due to the time needed to extract roots from soil cores and to manually sort them from crop residues before quantification. To avoid this tedious sorting step and remove operator subjectivity, a procedure based on NIR Hyperspectral Imaging (NIR-HSI) has been developed. [less ▲]

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See detailQuantification of roots by the use of NIR hyperspectral imaging and chemometrics
Eylenbosch, Damien ULiege; Baeten, Vincent; Bodson, Bernard ULiege et al

Poster (2017, June)

Roots, the belowground part of plants, play a major role in plant development. Their study in field conditions is important to identify suitable soil management practices for suitable crop production but ... [more ▼]

Roots, the belowground part of plants, play a major role in plant development. Their study in field conditions is important to identify suitable soil management practices for suitable crop production but roots are hidden by soil and their study is therefore difficult. Estimation of root system development is often based on the soil coring method which allows repeated measurements during the growing season in the field as well as in different soil horizons. However, this method is limited due to the time needed to extract roots from soil cores and to manually sort them from crop residues before quantification. To avoid this tedious sorting step and remove operator subjectivity, a faster sorting method was developed. Near infrared hyperspectral imaging (NIR-HIS) was tested as a rapid method to quantify the amount of roots in soil samples. [less ▲]

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See detailReduced Tillage generates higher N2O emissions: results of continuous chamber-based measurement in a winter wheat field.
Broux, François ULiege; Lognoul, Margaux ULiege; Theodorakopoulos, Nicolas et al

Poster (2017, April 24)

Agriculture is one of the most important contributors to GHG emission, notably through fertilized croplands. Though, few publications have studied simultaneously and through continuous measurement the N2O ... [more ▼]

Agriculture is one of the most important contributors to GHG emission, notably through fertilized croplands. Though, few publications have studied simultaneously and through continuous measurement the N2O and CO2 emissions in cultivated lands. We conducted this study to assess the effect of farming practices and climate on both N2O and CO2 emissions from a winter wheat crop. The experiment was held in an experimental field in the loamy region in Belgium from March 2016 till crop harvest in August 2016. The fluxes were measured on two nearby parcels in a winter wheat field with restitution of the residues from previous crop. For the past 8 years, one parcel was subjected to a Reduced tillage (RT, 10 cm depth) and the other one to a conventional tillage (CT, 25 cm depth). On each parcel, the emissions are assessed with homemade automated closed chambers. Measurement continuity and good temporal resolution (one mean flux every 4 hours) of the system allowed a fine detection and quantification of the emission peaks which usually represent the major part of N2O fluxes. In addition to gas fluxes, soil water content and temperature were measured continuously. Soil samples were taken regularly to determine soil pH, soil organic carbon and nitrogen pools (total, NO3- and NH4+) and study microbial diversity and nitrification/denitrification gene expression. Surprisingly, results showed N2O emissions twice as large in the RT parcel as in the CT parcel. On the contrary, less important CO2 emissions were observed under RT. Several emission peaks of N2O were observed during the measurement period. The peaks occurred after fertilization events and seemed to be triggered by an elevation of soil water content. Interesting links could be made between soil NH4-N and NO3-N pools and N2O emissions. Nitrification being the main process originating the fluxes was suggested on the one hand by the temporal evolution of nitrogen pools and N2O emissions and on the other hand by the relation between spatial variability of the emissions with the soil nitrate content. A comparison of the emissions between ST and CT and a discussion on peaks temporal dynamic, focusing on their intensity, duration and starting time will be presented. [less ▲]

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See detailImpact of tillage on greenhouse gas emissions by an agricultural crop and dynamics of N2O fluxes: Insights from automated closed chamber measurements
Lognoul, Margaux ULiege; Theodorakopoulos, Nicolas ULiege; Hiel, Marie-Pierre ULiege et al

in Soil & Tillage Research (2017), 167

Our experiment aimed at studying the impact of long term tillage treatments – reduced tillage (RT) and conventional tillage (CT), on CO2 and N2O emissions by soil and at describing the dynamics of N2O ... [more ▼]

Our experiment aimed at studying the impact of long term tillage treatments – reduced tillage (RT) and conventional tillage (CT), on CO2 and N2O emissions by soil and at describing the dynamics of N2O fluxes. Gas measurements were performed from June to October 2015 in a Belgian maize crop, with homemade automated closed chambers, allowing continuous measurement at a high temporal resolution. After 7 years of treatment, CO2 and N2O average emissions were significantly larger in the RT parcel than in the CT parcel. This observation was attributed to the effect of tillage on the distribution of crop residues within the soil profile, leading to higher soil organic C and total N contents and a greater microbial biomass in the upper layer in RT. A single N2O emission peak triggered by a sudden increase of water- filled pore space (WFPS) was observed in the beginning of the measuring campaign. The absence of large emission afterwards was most likely due to a decreasing availability of N as crop grew. N2O background fluxes showed to be significantly correlated to CO2 fluxes but not to WFPS, while the influence of soil temperature remained unclear. Our results question the suitability of reduced tillage as a “climate-smart” practice and suggest that more experiments be conducted on conservation practices and their potent negative effect on environment. [less ▲]

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