References of "Genot, Valérie"
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See detailApport de la pédologie au conseil de fumure personnalisé par l’intégration d’arguments morphospatiaux et physico-chimiques impliquant de nouveaux outils d’analyse : la carte numérique des sols de Wallonie et la spectroscopie proche infrarouge
Genot, Valérie ULg

Doctoral thesis (2014)

The current environmental and agronomical context requires that farmers manage their inputs with the utmost precision, which can only be achieved by developing state of the art tools leading to clear ... [more ▼]

The current environmental and agronomical context requires that farmers manage their inputs with the utmost precision, which can only be achieved by developing state of the art tools leading to clear, exhaustive and efficient decisions. In this context, soil analysis being a vital tool, we have endeavoured to refine the advice given to farmers by the Walloon soil analysis laboratories, members of the non-profit-making organization REQUASUD, by studying the opportunity of developing two complementary tools, one cartographic, the other analytical, which can be integrated in the daily running of a laboratory. First of all, to ensure that soil analysis provides reliable results, it is essential for the sample to be as representative as possible of the plot. Lacking this representativity, an analytical result, however accurate, would be devoid of meaning and give the farmer misleading advice. In the field, the main obstacle for the soil sampler is the recognition of soil criteria which are however essential in establishing fertility advice, especially in Wallonia (southern Belgium) due to a high soil variability. The Digital Soil Map of Wallonia, surveyed at a scale of 1/5000, should prove to be an invaluable tool that can be used easily and directly for routine work not only by soil samplers but also by farmers and agronomists. That’s why a mapping web portal REQUACARTO has been designed to help define homogenous morpho-pedological areas and to validate them in different situations. Furthermore, in Wallonia, certain soil properties seldom undergo routine analysis, despite their importance in fertility advice, and when they do, they result in the use of extracts which are harmful to the environment and to health. Therefore we investigated the feasibility of a routine application of near infrared reflectance spectroscopy (NIRS) to determine these soil properties. This technique offers a number of advantages compared to analyses carried out according to reference methods: speed, respect of the environment and health, recovery of the sample, ease of use and thus economy. On a selection of representative samples of the pedological context of Wallonia, for which we also had analytical results of exchange cation capacity, as well as rates of carbon, nitrogen and clay, trials were performed using NIRS instead of or in addition to laboratory reference analyses. The findings highlight the relevance of using NIRS and were substantiated by a study of repeatability and intermediate precision of the technique. The spectral library was then transferred to the different soil analysis laboratories of the network. The goal is multiple: to offer further analyses to farmers at no extra cost, reduce the number of analyses performed according to reference methods and implement the spectral library with samples not predicted by NIRS to improve predictions. [less ▲]

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See detailL’intérêt de la spectroscopie proche infrarouge en analyse de terre (synthèse bibliographique)
Genot, Valérie ULg; Bock, Laurent ULg; Dardenne, Pierre et al

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment [=BASE] (2014), 18(2),

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See detailAssigned value determination on soil materials throughout the whole analytical field introducing bias correction from reference materials
Planchon, Viviane; Renneson, Malorie ULg; Goffaux, Marie-Julie et al

Poster (2013, September)

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See detailEstablishing Reference Systems on Soil Quality: Example of the “ReQuaSud” Laboratory Network in Wallonia – Belgium
Colinet, Gilles ULg; Renneson, Malorie ULg; Genot, Valérie ULg et al

Conference (2013, May 24)

Soil quality is a central concern regarding sustainable multifunctionnality of cultivated and natural territories : food and non-food biomass production, environmental and ecosystemic services… Quality ... [more ▼]

Soil quality is a central concern regarding sustainable multifunctionnality of cultivated and natural territories : food and non-food biomass production, environmental and ecosystemic services… Quality indicators and reference levels are needed in order to evaluate the state of the soil resources from a given land, for land-use planning or and to detect any temporal evolution. Our department has been involved for years in the implementation of substantial databases about soil quality in the Walloon region. The communication aims at sharing our experience in the establishment of soil evaluation references and tools, geographic databases, time monitoring, analysis networking, applied to the questions of soil fertility and soil contaminations. The Requasud network is a regional initiative aiming at harmonizing the methods for soil sampling, analysis, and interpretation. We will present how 20 years of applied research led to the sound implementation of a dataset of more than 200,000 samples in cultivated fields all across Wallonia, and where are the remaining questions and needs for future research. Discussions should then focus to comparisons with the situations encountered by the participants to the Workshop. [less ▲]

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See detailBase de données sols de REQUASUD - 3ème synthèse
Genot, Valérie ULg; Renneson, Malorie ULg; Colinet, Gilles ULg et al

Book published by ASBL REQUASUD - D/2012/8689/1 (2012)

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See detailDevelopment of a regional-scale library of near infrared reflectance soil spectra for alternative assessment of soil characteristics in Southern Belgium
Genot, Valérie ULg; Dardenne, Pierre; Bock, Laurent ULg et al

Poster (2012)

In Walloon Region (Southern Belgium), five routine soil laboratories are grouped within a network promoting a better quality in analysis (www.requasud.be). The harmonization of protocols as well as ... [more ▼]

In Walloon Region (Southern Belgium), five routine soil laboratories are grouped within a network promoting a better quality in analysis (www.requasud.be). The harmonization of protocols as well as methodological or technical prospective are realized under scientifically supervision of our research laboratory. In this context, a study was conducted to evaluate the ability of the NIRS to predict some soil properties: CEC, TOC, TN and clay content. The initial models were elaborated upon local PLS regression on set of 1 300 soil samples. The local PLS calibration used allows an accurate prediction of the soil properties and precision of NIRS technique is comparable to reference analytical method [less ▲]

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See detailApplication de la spectrométrie proche infrarouge à l'analyse de terre
Genot, Valérie ULg; Colinet, Gilles ULg; Bock, Laurent ULg et al

in Actes des 10èmes rencontres de la fertilisation raisonnée et de l'analyse de terre (2011, November)

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See detailUn conseil de fumure raisonné - le cas du phosphore
Genot, Valérie ULg; Renneson, Malorie ULg; Bock, Laurent ULg et al

Book published by ASBL REQUASUD - Edition 2011 (2011)

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See detailNear infrared reflectance spectroscopy for estimating soil characteristics valuable in the diagnosis of soil fertility
Genot, Valérie ULg; Colinet, Gilles ULg; Bock, Laurent ULg et al

in Journal of Near Infrared Spectroscopy [=JNRIS] (2011), 19(2), 117-138

Soil fertility diagnostics rely not only upon measurement of available nutrients but also upon the soil’s ability to retain these nutrients. Near-infrared reflectance spectroscopy (NIRS) is a rapid and ... [more ▼]

Soil fertility diagnostics rely not only upon measurement of available nutrients but also upon the soil’s ability to retain these nutrients. Near-infrared reflectance spectroscopy (NIRS) is a rapid and non-destructive analytical technique which allows to simultaneously estimate standard soil characteristics and does not require use of chemicals. Previous studies showed that NIRS could be used in local contexts to predict soil properties. The main goal of our research is to build a methodological framework for the use of NIRS at a more global scale. The specific goals of this study were (i) to identify the best spectra treatment and processing –LOCAL versus GLOBAL regression- methods, (ii) to compare NIRS performances to standard chemical protocols and (iii) to evaluate the ability of NIRS to predict soil total organic carbon (TOC), total Nitrogen (TN), clay content and cationic exchange capacity (CEC) for a wide range of soil conditions. We scanned 1,300 samples representative of main soil types of Wallonia under crop, grassland or forest. Various sample preparations were tested prior to NIRS measurements. The most appropriate options were selected according to ANOVA analysis and multiple means comparisons of the spectra principal components. Fifteen pre-treatments were applied to a calibration set and the prediction accuracy was evaluated for GLOBAL and LOCAL modified partial least square (MPLS) regression models. The LOCAL MPLS calibrations showed very encouraging results for all the studied characteristics. On average, for crop soil samples, the prediction coefficient of variation (CVp) was close to 15% for TOC content, 7% for TN content, and 10% for clay content and CEC. The comparisons of repeatability and reproducibility of both NIRS and standard methods showed that NIRS is as reliable as reference methods. Prediction accuracy and technique repeatability allow the use of NIRS within the framework of the soil fertility evaluation and its replacement of standard protocols. LOCAL MPLS can be applied within global datasets, such as the International global soil spectral library. However, the performance of LOCAL MPLS is linked to the number of similar spectra in the dataset and more standard measurements are needed to characterize the least widespread soils. [less ▲]

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See detailMéthodologie de constitution d'une collection d'échantillons de sols en relation avec les principaux matériaux parentaux en Wallonie (Belgique méridionale)
Legrain, Xavier ULg; Renneson, Malorie ULg; Genot, Valérie ULg et al

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment [=BASE] (2011), 15(S2), 683-697

Over the past few years, there has been growing concern about soils and their properties, thanks to greater environmental awareness. Consequently, existing documents on soil are valuable in risk ... [more ▼]

Over the past few years, there has been growing concern about soils and their properties, thanks to greater environmental awareness. Consequently, existing documents on soil are valuable in risk assessment and for the research of well-adapted solutions. In this context, this paper reviews the main stages of soil mapping in Belgium and presents current works to valorize the Digital Soil Map of Wallonia and update associated databases. Belgium is among the first countries to be completely covered by a detailed soil map (1:20,000). The origin of the Soil Map of Belgium, its realisation between 1947 and 1991, the principles and characteristics as well as the related products are described. But since its publication, due to the increasing need of soil information and thanks to the development of geographical information systems the Walloon part of the map was digitalised between 2000 and 2003 by the Digital Soil Map of Wallonia (DSMW) Project. From this early action at regional level, a selection of immediately derived products is presented and briefly commented. However, if these products go beyond the initial objective of agricultural production increase, they do not always meet the environmental challenges nor the future legislation at European, national and regional levels. To fill this gap, the recent tasks carried out by the DMSW team are presented through a description of their methodological and technical framework. The long-term objective is to build Regional Soil Information Systems based on the use of the Digital Soil Map of Wallonia as a tool of integration, structuring and referencing of pedological information. [less ▲]

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See detailPour un échantillonnage et un conseil agronomique raisonné, les outils d'aide à la décision
Genot, Valérie ULg; Buffet, Dominique; Legrain, Xavier ULg et al

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment [=BASE] (2011), 15(S2), 657-668

Environmental and agronomic issues require always more well thought and suited farmer management of agricultural inputs; soil analysis is therefore an essential tool to support decision. However, for a ... [more ▼]

Environmental and agronomic issues require always more well thought and suited farmer management of agricultural inputs; soil analysis is therefore an essential tool to support decision. However, for a soil analysis to provide valuable information, it is essential for the sample to be representative of the studied field. Without this representativeness, an analytical result, as accurate as it could be, would not be of interest if it could mislead the farmer. In practice, the main difficulty for the sampler is the recognition of soil criteria which are essential to provide a fertility advice, especially in Wallonia (Belgium) where soil variability is very important. With the Digital Soil Map of Wallonia (DSMW), drowned at the scale 1/5,000, it seems appropriate to give these information to the samplers in an useful form for routine works. That is why a mapping tool for decision support, named REQUACARTO, was designed to be used for soil analysis by provincial laboratories, members of the REQUASUD laboratories network. This tool responds to a real requirement in Wallonia: achieving a quality sampling for the development of personalized soil fertility advice. [less ▲]

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See detailMéthodologie d’acquisition d’une collection d’échantillons de sols liés aux matériaux parentaux en Wallonie
Legrain, Xavier ULg; Renneson, Malorie ULg; Genot, Valérie ULg et al

Poster (2010, November 24)

Malgré l'exiguïté de son territoire, la Wallonie est dotée d’un contexte géologique particulièrement varié et contrasté. Des grandes géostructures aux formations lithostratigraphiques, cette diversité se ... [more ▼]

Malgré l'exiguïté de son territoire, la Wallonie est dotée d’un contexte géologique particulièrement varié et contrasté. Des grandes géostructures aux formations lithostratigraphiques, cette diversité se reflète au niveau des situations pédologiques rencontrées. En effet, l’altération des roches, à l’origine du matériau parental, constitue un des processus majeurs indispensables à la formation d’un sol. Par ailleurs, à travers sa nature et sa composition, ce matériau d’origine est reconnu comme un des facteurs prépondérants influençant la pédogenèse, et de ce fait, les propriétés des sols. Fort de ce constat, l’Unité de Science du Sol de Gembloux Agro-Bio Tech, à travers la collaboration de divers projets, a entrepris la collecte d’échantillons de sols, en relation avec les matériaux parentaux à l’origine de la majorité des sols présents en Wallonie. L’objectif poursuivi est (i) d’acquérir des données à caractère « permanent », intrinsèques à ces matériaux parentaux, afin d’en dégager une signature chimique, physico-chimique, physique et spectrale, et (ii) de mettre en évidence l’influence tant du matériau parental que de l’occupation du sol sur les propriétés des horizons de surface. L’originalité du travail réside en partie dans la stratégie d’échantillonnage, basée sur une stratification pédologique et géographique, par la prise en compte respectivement de la Carte des Principaux Types de Sols de Wallonie et des Unités de l’Espace Rural. Les choix opérés ont conduit à la sélection de 12 matériaux parentaux, chacun faisant l’objet de prélèvements en 10 points (surface et profondeur). La localisation précise de ces points a été déterminée sur base d’une analyse et de la confrontation de documents cartographiques existants, se rapportant essentiellement aux sigles pédologiques, aux formations lithostratigraphiques, au relief et à l’occupation des sols. Un total de 258 échantillons a ainsi été prélevé en 120 points (76 en culture, 15 en prairie temporaire et 29 en prairie permanente). Parmi les analyses déjà réalisées citons, outre le menu d’analyse classique en pédologie (pH H2O et KCl, carbonates, granulométrie, COT, CEC, …), la détermination des formes du phosphore (total, minéral, organique ou disponible), des teneurs totales en éléments traces métalliques, la mesure de paramètres physiques ou hydriques tels que les limites d’Atterberg ou les courbes pF, ainsi que diverses analyses par spectroscopie proche infrarouge. Parmi les mesures envisagées à l’avenir, citons des analyses minéralogiques et des mesures de stabilité structurale. [less ▲]

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See detailDes outils d'aide à la décision pour un échantillonnage, un conseil agronomique et un conseil environnemental personnalisés
Genot, Valérie ULg; Cugnon, Thibaut; Buffet, Dominique et al

Conference (2010, November 24)

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