Publications of Gilles Colinet
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See detailTemporal evolution of PAHs bioaccessibility in an aged-contaminated soil during the growth of two Fabaceae.
Davin, Marie ULiege; Renard, Elisa; Lefébure, Kévin ULiege et al

in International Journal of Environmental Research and Public Health (2020)

Polycyclic aromatic hydrocarbons (PAHs) are health-concerning organic compounds that accumulate in the environment. Bioremediation and phytoremediation are studied to develop eco-friendly remediation ... [more ▼]

Polycyclic aromatic hydrocarbons (PAHs) are health-concerning organic compounds that accumulate in the environment. Bioremediation and phytoremediation are studied to develop eco-friendly remediation techniques. In this study, the e ects of two plants (Medicago sativa L. and Trifolium pratense L.) on the PAHs’ bioaccessibility in an aged-contaminated soil throughout a long-term rhizoremediation trial was investigated. A bioaccessibility measurement protocol, using Tenax® beads, was adapted to the studied soil. The aged-contaminated soil was cultured with each plant type and compared to unplanted soil. The bioaccessible and residual PAH contents were quantified after 3, 6 and 12 months. The PAHs’ desorption kinetics were established for 15 PAHs and described by a site distribution model. A common Tenax® extraction time (24 h) was established as a comparison basis for PAHs bioaccessibility. The rhizoremediation results show that M. sativa developed better than T. pratense on the contaminated soil. When plants were absent (control) or small (T. pratense), the global PAHs’ residual contents dissipated from the rhizosphere to 8% and 10% of the total initial content, respectively. However, in the presence of M. sativa, dissipation after 12 months was only 50% of the total initial content. Finally, the PAHs’ bioaccessible content increased more significantly in the absence of plants. This one-year trial brought no evidence that the presence of M. sativa or T. pratense on this tested aged-contaminated soil was beneficial in the PAH remediation process, compared to unplanted soil. [less ▲]

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See detailRhizoremediation of an aged-contaminated soil with two Fabaceae: impact on PAHs bioaccessibility.
Davin, Marie ULiege; Colinet, Gilles ULiege; Fauconnier, Marie-Laure ULiege

Conference (2020, January 31)

Polycyclic aromatic hydrocarbons (PAHs) are a class of persistent organic compounds that tend to accumulate in the environment. Because of their potential (geno)toxicity and heavy presence in former ... [more ▼]

Polycyclic aromatic hydrocarbons (PAHs) are a class of persistent organic compounds that tend to accumulate in the environment. Because of their potential (geno)toxicity and heavy presence in former industrial areas (Keith 2015), PAHs have been the centre of many remediation studies over the past decades. As an alternative to environmentally aggressive, expensive and often disruptive soil remediation strategies, experiences have been carried on to understand and develop techniques based on bioremediation and phytoremediation, which rely on the use of living microorganisms or plants to remediate pollutions in soil. Because it is now well-known that the most important limiting factor to PAHs bioremediation is their bioaccessibility (Johnsen et al. 2015), the objective of the study was to investigate the effect of two plants (Medicago sativa L. and Trifolium pratense L.) on PAHs bioaccessibility in an aged-contaminated soil throughout a long-term rhizoremediation trial. Therefore aged-contaminated soil samples were cultured with each plant-type, in pots, for 3, 6 and 12 months, and compared to untreated soil. Each modality was repeated five times. Bioaccessible and residual PAHs contents were quantified in soil samples at the end of each culture period using High-Performance Liquid Chromatography with Fluorimetric Detection (HPLC-FLD). The general rhizoremediation results show that (i) M. sativa L. plants developed better than T. pratense L. plants on the contaminated soil, (ii) when plants are small or absent, PAHs residual contents globally dissipate faster from the rhizosphere, and bioaccessible contents increase a little faster. Johnsen AR, Wick LY, Harms H. 2005. Principles of microbial PAH-degradation in soil. Environ Pollut. 133(1):71–84. doi:10.1016/j.envpol.2004.04.015. Keith LH. 2015. The Source of U.S. EPA’s Sixteen PAH Priority Pollutants. Polycycl Aromat Compd. 35(2–4):147–160. doi:10.1080/10406638.2014.892886. [less ▲]

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See detailLong-term fertilization and intensive cropping enhance carbon and nitrogen accumulated in soil clay-sized particles of red soil in South China
Xu, Hu; Liu, Kailou; Zhang, Wenju et al

in Journal of soils and sediments : JSS. (2020), 20(4), 1824-1833

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See detailSpatial variability of soil properties in red soil and its implications for site-specific fertilizer management
SONG, Fang-Fang; XU, Ming-Gang; DUAN, Ying-Hua et al

in Journal of integrative agriculture : JIA = 农业科学学报(英文版) (2020), 19(9), 2313-2325

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See detailInvestigating the Effect of Medicago sativa L. and Trifolium pratense L. Root Exudates on PAHs Bioremediation in an Aged-Contaminated Soil
Davin, Marie ULiege; Starren, Amandine ULiege; Marit, Emilie ULiege et al

in Water, Air and Soil Pollution (2019), 230

Polycyclic aromatic hydrocarbons (PAH) are persistent organic compounds of major concern that accumulate in the environment, especially soils, and require remediation. Researches to develop bioremediation ... [more ▼]

Polycyclic aromatic hydrocarbons (PAH) are persistent organic compounds of major concern that accumulate in the environment, especially soils, and require remediation. Researches to develop bioremediation and phytoremediation (alternative eco-friendly technologies) are being conducted. First, a bioaccessibility measurement protocol was adapted to a brownfield soil using Tenax® beads in order to compare PAHs bioaccessibility in soil samples. PAHs desorption kinetics were established, described by a site distribution model, and a common extraction time was calculated (48 h). Second, the role of two Fabaceae (Medicago sativa L. or Trifolium pratense L.) root exudates in enhancing PAHs bioaccessibility and biodegradation in the studied soil was evaluated during microcosms experiments (28 °C). The CO2 emissions were significantly higher in presence of T. pratense exudates; the dehydrogenase activities showed improvements of the soil microbial activity in presence of two types of root exudates compared to untreated soil samples; the PAHs residual contents decreased more in untreated samples than in the presence of T. pratense exudates; and M. sativa exudates lowered PAHs bioaccessibility but not residual contents. [less ▲]

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See detailDoes innovative P fertilization enhance P use efficiency and plant stress tolerance?
Loudari, Aicha ULiege; Khourchi, Said ULiege; Bourak, Kaoutar ULiege et al

Poster (2019, October 07)

In Africa, agriculture is by far the economic sector that contributes most to the local development and employment incomes. However, limited water availability, nutrient deficiency, soil salinity and ... [more ▼]

In Africa, agriculture is by far the economic sector that contributes most to the local development and employment incomes. However, limited water availability, nutrient deficiency, soil salinity and plant diseases are, among others, the most damaging biotic and abiotic constraints to crop productivity. These constraints impact plant growth by affecting key physiological, biochemical and molecular functions. In addition, many soils exhibit an inherent low fertility level, in particular for phosphorus (P) which represents an adverse constraint to achieve better yields. Our projects aim to improve the fertilizer use efficiency in responses to adequate fertilizer inputs as well as crop responses under two main constraints namely soil salinity and plant diseases. This will allow us to propose an integrated approach in order to develop a more sustainable plant P nutrition. On one hand, a new approach based on root investigation both morphology and functioning (growth mapping, exudates, etc.) and the related rhizosphere microorganisms will be adopted to improve P use and acquisition efficiency. On the other hand, we will investigate the modeling responses of crops to P-fertilization under salinity conditions to develop an early prediction tool to mitigate this constraint. We will also address the impact of P-fertilizers supply on microbial biodiversity and their role on phytopathogenic effect alleviation, which might cause considerable losses in crop production. These projects will contribute to link laboratory to field experiments, for a better understanding of soil-plant-microbe interactions under different biotic and abiotic contexts. [less ▲]

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See detailSANISOL, un outil pilote de recommandations aux producteurs de légumes et de fruits sur sol contaminé en Wallonie (Belgique)
Liénard, Amandine ULiege; Fontenoy, Delphine; Pereira, Benoît et al

Conference (2019, March 26)

Objectif Le projet SANISOL, à travers la mise en œuvre d’un outil informatique pilote sur Internet, vise à fournir des recommandations particulières de gestion et d’utilisation à tout producteur de ... [more ▼]

Objectif Le projet SANISOL, à travers la mise en œuvre d’un outil informatique pilote sur Internet, vise à fournir des recommandations particulières de gestion et d’utilisation à tout producteur de biomasse alimentaire (notamment légumes et fruits) sur sols contaminés en Wallonie. Caractère innovant du sujet proposé L’originalité de cette étude repose sur le caractère multidisciplinaire et multi-acteurs de l’approche. Elle mobilise des compétences en matière d’échantillonnage et d’analyses de sols, de légumes et de fruits ainsi qu’un biomonitoring avec prélèvements d’échantillons biologiques (cheveux, sang, urine), le tout en concertation avec les acteurs régionaux et locaux. Les objectifs poursuivis étant de livrer des recommandations adaptées à la production potagère et à la fréquentation des potagers pour les personnes réalisant une activité de jardinage en vue d’une autoconsommation sur sol contaminé. En outre, elle rassemble des acteurs d’horizons différents : des scientifiques (Université de Liège et Université Catholique de Louvain), des organismes d’intérêt public (SPAQuE, ISSeP, Espace Environnement), le secteur associatif et les pouvoirs publics. Résumé Le projet SANISOL s’articule autour de cinq volets : l’étude des transferts sols-plantes en métaux en jardins potagers, le diagnostic du modèle S-Risk© pour la production végétale, un programme d’action Environnement-Santé à l’aide d’un biomonitoring, la configuration d’un outil informatique pilote et une gestion de la communication avec production d’un contenu « Sols potagers pollués » diffusable au grand public. L’association de ses différentes approches permettra la détermination de teneurs limites en polluants dans le sol en vue d’assurer la qualité commerciale des productions végétales en Wallonie et la gestion des risques pour les producteurs et les jardiniers. En effet, la pratique du jardinage est en recrudescence et elle démontre plusieurs bienfaits physiques, sociaux, psychiques, etc. Cependant, l’autoproduction en jardins collectifs ou privatifs se heurte aux interrogations grandissantes quant aux risques sanitaires liés à la pollution en métaux (arsenic, cadmium, mercure, plomb, zinc, etc.) relevée dans certains sols en Wallonie (provenant des activités industrielles historiques ou du fond pédogéochimique naturel). Au terme du projet, un outil informatique disponible sur Internet, sera capable d’émettre des recommandations sur les productions végétales réalisées sur une parcelle qui aurait fait l’objet d’une analyse de sol, voire de légumes (Figure 1). Par le biais d’un questionnaire, l’utilisateur fournit diverses informations telles que : les concentrations en métaux dans le sol ainsi que le type de légumes ou fruits autoproduits, ses habitudes alimentaires, la fréquentation du jardin potager, etc. Sur base de ces données, un modèle d’évaluation des risques construit à partir d’équations de transfert sols-plantes, de valeurs toxicologiques de références, de valeurs de bioaccessibilité spécifiques à chaque métal générera des recommandations en matière de production végétale et de gestion à la parcelle. [less ▲]

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See detailInvestigating the effect of plants on PAHs dissipation and bioaccessibility in brownfield contaminated soils (3 and 6 months cultures).
Davin, Marie ULiege; Fauconnier, Marie-Laure ULiege; Colinet, Gilles ULiege et al

Poster (2019, February 04)

Polycyclic aromatic hydrocarbons (PAHs) are a class of persistant organic compounds of major concern that tend to accumulate in the environment, damaging ecosystems and health. Brownfields represent an ... [more ▼]

Polycyclic aromatic hydrocarbons (PAHs) are a class of persistant organic compounds of major concern that tend to accumulate in the environment, damaging ecosystems and health. Brownfields represent an important tank for PAHs and require remediation. As an alternative to environmentally aggressive, expensive and often disruptive soil remediation strategies, experiences have been carried on to understand and develop techniques based on bioremediation and phytoremediation. The main objective of the study was to investigate the potential of plants (Medicago sativa L. or Trifolium pratense L.) as PAHs bioremediation enhancers on an aged-contaminated soil. The first step was to adapt a bioaccessibility measurement protocol, using Tenax® beads, to the studied contaminated soil. Meanwhile soil samples were cultured in pots with one of the plant species for three, six, nine, and twelve months and compared to unplanted soil samples. Each modality was repeated five times for a total of 60 samples. PAHs desorption kinetics were established for 15 PAHs and described by a site distribution model. A common Tenax® beads extraction time (24 h) was established as a comparison basis for PAHs bioaccessibility assessments. Bioaccessible and residual PAHs were quantified using High-Performance Liquid Chromatography with Fluorimetric Detection (HPLC-FLD) on the three and six months samples, as the experiment is still underway. Preliminary results will be discussed. [less ▲]

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See detailConcentrations and sources of Cd, Cr, Cu, Fe, Ni, Pb and Zn in soil of the Mitidja plain, Algeria
Laribi, Abdelkader ULiege; Shand, C.; Wendler, R. et al

in Toxicological and Environmental Chemistry (2019), 101(1-2), 59-74

In the last few decades, the Mitidja plain has undergone economic development which may have altered the concentrations of some trace metals in its soils. Therefore, this study was aimed at investigating ... [more ▼]

In the last few decades, the Mitidja plain has undergone economic development which may have altered the concentrations of some trace metals in its soils. Therefore, this study was aimed at investigating the concentrations and sources of Cd, Cr, Cu, Fe, Ni, Pb and Zn in 180 composite topsoil samples using a combination of environmental quality indicators and multivariate statistical approaches with a geographic information system (GIS). Based on spatial distribution maps, various hot-spots have been identified. Enrichment factors (EFs) indicated that Cd, Cu, Pb and Zn were from anthropogenic sources, while Ni and Cr were controlled mainly by natural lithogenic source. Multivariate statistical analyses were in agreement, except for Cu which was classified as coming from both anthropogenic and lithogenic sources. © 2019, © 2019 Informa UK Limited, trading as Taylor & Francis Group. [less ▲]

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See detailGeochemical Baseline Values Determination and Evaluation of Heavy Metal Contamination in Soils of Lanping Mining Valley (Yunnan Province, China)
Li, Zuran; Deblon, Judith; Zu, Yanqun et al

in International Journal of Environmental Research and Public Health (2019), 16(23),

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See detailFactors of Variation of Soil Chemical Properties in Metalliferous Ecosystems of Tenke-Fungurume, Katanga, D. R. Congo
Kaya Muyumba, Donato ULiege; Ilunga wa Ilunga, Edouard; Faucon, Michel-Pierre et al

in Tropicultura (2019)

Our study aimed at deepen our understanding of relationships between soil properties and vegetation distribution in metalliferous ecosystems of Tenke-Fungurume in the Democratic Republic of Congo. The ... [more ▼]

Our study aimed at deepen our understanding of relationships between soil properties and vegetation distribution in metalliferous ecosystems of Tenke-Fungurume in the Democratic Republic of Congo. The first question concerned the differences and similarities between soils of the main vegetation units and four variation factors of soil properties were summarized by multivariate analysis. They were all linked to lithology and significantly contributed to explain the distribution of vegetation units. Our result suggest that the variation of soil properties which is observed within the various vegetation units (rocky steppe savanna, sward, and steppe savannas on slope or on Dembo) should partially be attributed to differences of geochemical composition of rocks between sites but the main source of variability is to be found inside each hill. The soil contamination in Cu and Co originates from rock weathering and besides site effect and topographic distribution of the rocks, the variability of soil properties within one vegetation unit may be due to variability of soil parent material and not only to erosion. The second question dealt with the changes of soil properties at small distances. Metric variation was studied from transects between adjacent vegetation units. Our results showed that the abrupt changes of vegetation units which were clearly identified on the field were all truly explained by the variations of one or more properties linked to lithology. The key point being the Cu bioavailability. [less ▲]

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See detailMobility of copper and cobalt in metalliferous ecosystems: Results of a lysimeter study in the Lubumbashi Region (Democratic Republic of Congo)
Kaya Muyumba, Donato ULiege; Pourret, Olivier; Liénard, Amandine ULiege et al

in Journal of Geochemical Exploration (2019), 196

This paper presents the results of a lysimeter experiment in which a forest soil has been artificially spiked with rock fragments from natural copper (Cu) and cobalt (Co)-hills from Tenke-Fungurume ... [more ▼]

This paper presents the results of a lysimeter experiment in which a forest soil has been artificially spiked with rock fragments from natural copper (Cu) and cobalt (Co)-hills from Tenke-Fungurume (Democratic Republic of Congo). The Cu and Co contents of the percolating water have been analysed at repeated intervals and the impact of rock on the soil properties was evaluated at the end of the experiment. Five rocks were sampled in one copper hill. In natural conditions, these rock fragments located on the top of the hill are mixed to surface soil horizon along the slope through colluvial processes. The Cu and Co contents in rocks range respectively between 470 mg/kg (siliceous rock) and 140,000 mg/kg (shale) and between 450 mg/kg (dolostone) and 5,300 mg/kg (shale). Rock fragments were mixed with two horizons (hemi-organic A with 2.7% total organic carbon (TOC), and mineral B with 0.3% TOC) of an acid (pH water < 4.5) acrisol under forest. The mixture was placed in 1 L lysimeters and left in Lubumbashi ex situ conditions during the rainy season. Percolating water was collected for six periods after and the Cu and Co contents have been analysed. At the end of the experiment, soil from the lysimeter was removed for pH, TOC, available nutrients and trace elements, CaCl2-extractable Cu and Co analysis. The results show great differences between Cu and Co releases in the percolating solutions according to the nature of the rocks. The quantities released were correlated to the concentrations originally present in the unweathered rocks. Differences were also found between the A and B horizons, which indicate that the physicochemical properties of the soil influence reaction with the rocks. The differences between both horizons are mainly organic carbon content, cationic exchange capacity and nutrient content, which were higher in the A horizon. However, the pH of the A horizon was acidic compared with the B horizon. Significant correlations were found between extractable Cu and Co with concentrations of their leaching solution. Because of this, soluble Cu and Co extracted by CaCl2 can be regarded as vertical transfer risk prediction tools of Cu and Co in the soil. [less ▲]

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See detailMon sol, mon potager et moi ! (Brochure - SANISOL)
Liénard, Amandine ULiege; Colinet, Gilles ULiege; Fontenoy, Delphine et al

Diverse speeche and writing (2019)

CULTURE POTAGÈRE ET QUALITÉ DES SOLS : comment évaluer et réduire les risques éventuels pour la santé humaine liés à la fréquentation d’un sol pollué et la consommation des produits issus d’une activité ... [more ▼]

CULTURE POTAGÈRE ET QUALITÉ DES SOLS : comment évaluer et réduire les risques éventuels pour la santé humaine liés à la fréquentation d’un sol pollué et la consommation des produits issus d’une activité de jardinage ? Sensibiliser à la question de la pollution des sols, outiller et accompagner les jardiniers dans l’évaluation et la gestion des risques liés à la culture sur un sol pollué ; tels sont les objectifs poursuivis par cette brochure. [less ▲]

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See detailTransfert des polluants du sol vers les plantes potagères
Liénard, Amandine ULiege; Colinet, Gilles ULiege

Conference given outside the academic context (2018)

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See detailEffects of Permaculture Practices on Soil Physicochemical Properties and Organic Matter Distribution in Aggregates: A Case Study of the Bec-Hellouin Farm (France)
de Tombeur, Félix ULiege; Sohy, Valentin ULiege; Chenu, Claire et al

in Frontiers in Environmental Science (2018), 6

The limitations of conventional agriculture have accelerated the need for a transition to an environmentally and economically sustainable agricultural model. In this regard, the role played by soil ... [more ▼]

The limitations of conventional agriculture have accelerated the need for a transition to an environmentally and economically sustainable agricultural model. In this regard, the role played by soil organic matter (SOM) is key. Here, we aimed to study the impact of permaculture and biointensive micro-gardening practices, characterized by intensive cultivation, the use of large and localized organic inputs and the non-use of mineral fertilizers and pesticides, on soil physicochemical properties and SOM distribution in aggregate-size fractions. The physicochemical properties of soils in permaculture farming implemented for 7 years were compared with a soil under pasture. A soil experiencing conventional agriculture practices in similar geopedoclimatic conditions was simultaneously studied. Soils were separated into four aggregate-size fractions, into which organic carbon (OC) concentrations have been measured. The major soil physicochemical properties were measured on the bulk soils. The concentrations of total OC and nitrogen (N) in bulk soils were higher under permaculture practices, due to significant inputs of manure and compost, resulting in higher concentrations of the bioavailable nutrients Ca, Mg, K, and P. The permaculture practices sustained a level of macroaggregation similar to that of the pasture, and well above that of conventional practices. OC concentrations increased in the 250–2,000, 50–250 μm and occluded 50–250 μm fractions, but not in the <50 μm fraction compared to pasture. This can be explained by the too short duration of permaculture practices for allowing the decomposition of coarse particulate organic matter (POM) into fine sized SOM that is more associated with mineral particles. The higher OC stocks in permaculture are therefore mainly governed by the coarse POM fraction. Our results show that permaculture/biointensive micro-gardening practices enhance SOM storage and modify the distribution of SOM in aggregate-size fractions, while substantially improving nutrient bioavailability and suggest that these practices strongly affect soil properties. The effects of permaculture practices on soil properties would certainly vary depending on geopedoclimatic context, justifying the need to implement the approach for other soil types. Finally, we recommend to compare biogeochemical budget and nutrients use efficiency of permaculture gardening with conventional horticulture gardening. [less ▲]

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See detailExploitation des données issues de la base de données centralisée et valorisation des données au sein du réseau REQUASUD. La qualité des sols
Mariage, Clémence ULiege; Renneson, Malorie; Colinet, Gilles ULiege

Scientific conference (2018, May 31)

Présentation de l'état de la base de données sol de REQUASUD et de son importance pour la gestion des sols wallons.

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See detailImpact of crop residue management on crop production and soil chemistry after seven years of crop rotation in temperate climate, loamy soils
Hiel, Marie-Pierre ULiege; Barbieux, Sophie; Pierreux, Jérome ULiege et al

in PeerJ (2018), 6(e4836),

Society is increasingly demanding a more sustainable management of agro-ecosystems in a context of climate change and an ever growing global population. The fate of crop residues is one of the important ... [more ▼]

Society is increasingly demanding a more sustainable management of agro-ecosystems in a context of climate change and an ever growing global population. The fate of crop residues is one of the important management aspects under debate, since it represents an unneglectable quantity of organic matter which can be kept in or removed from the agro-ecosystem. The topic of residue management is not new, but the need for global conclusion on the impact of crop residue management on the agro-ecosystem linked to local pedo-climatic conditions has become apparent with an increasing amount of studies showing a diversity of conclusions. This study specifically focusses on temperate climate and loamy soil using a seven-year data set. Between 2008 and 2016, we compared four contrasting residue management strategies differing in the amount of crop residues returned to the soil (incorporation vs. exportation of residues) and in the type of tillage (reduced tillage (10 cm depth) vs. conventional tillage (ploughing at 25 cm depth)) in a field experiment. We assessed the impact of the crop residue management on crop production (three crops—winter wheat, faba bean and maize—cultivated over six cropping seasons), soil organic carbon content, nitrate (NO−3), phosphorus (P) and potassium (K) soil content and uptake by the crops. The main differences came primarily from the tillage practice and less from the restitution or removal of residues. All years and crops combined, conventional tillage resulted in a yield advantage of 3.4% as compared to reduced tillage, which can be partly explained by a lower germination rate observed under reduced tillage, especially during drier years. On average, only small differences were observed for total organic carbon (TOC) content of the soil, but reduced tillage resulted in a very clear stratification of TOC and also of P and K content as compared to conventional tillage. We observed no effect of residue management on the NO−3 content, since the effect of fertilization dominated the effect of residue management. To confirm the results and enhance early tendencies, we believe that the experiment should be followed up in the future to observe whether more consistent changes in the whole agro-ecosystem functioning are present on the long term when managing residues with contrasted strategies. [less ▲]

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See detailAnthropisation des paysages katangais
Bogaert, Jan ULiege; Colinet, Gilles ULiege; Mahy, Grégory ULiege

Book published by Les Presses Universitaires de Liège - Agronomie - Gembloux (2018)

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