Sylvain Roger Perret

Sylvain Roger Perret
Cirad - La recherche agronomique pour le développement | CIRAD · Centre de Coopération Internationale en Recherche Agronomique pour le Développement (CIRAD)

PhD, Habilitated

About

103
Publications
34,267
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
2,153
Citations
Introduction
Researcher at CIRAD, France, Director at CIRAD, Department "Environments & Societies". Agronomist, agro-economist, water and irrigation specialist, with an interest in sustainable agricultural production, environmental engineering, natural resources management, Posted in Montpellier, France. Previously posted at the AIT, Bangkok, Thailand, University of Pretoria, South Africa, and CIRAD at Reunion Island. https://www.cirad.fr/qui-sommes-nous/organigramme/departements-scientifiques/environnements-et-societes-es/presentation
Additional affiliations
January 2007 - June 2014
Asian Institute of Technology
Position
  • Visiting Associate Professor
January 1999 - November 2006
University of Pretoria
Position
  • Visiting Associate Professor
June 1987 - present
Cirad - La recherche agronomique pour le développement
Position
  • Senior Researcher

Publications

Publications (103)
Preprint
RESUME. Les changements de perceptions et d'attentes des sociétés concernant la recherche agricole, et l'ampleur des défis qu'affrontent les sociétés en développement imposent des évolutions à un organisme de recherche tel que le Cirad. Les évolutions entreprises sont de natures institutionnelles, épistémologiques, axiologiques, scientifiques et op...
Preprint
Full-text available
Ce chapitre décrit les évolutions d'un organisme de recherche agricole dédié à l'appui au développement des pays du sud, le Cirad. Ces évolutions sont de natures épistémologique, méthodologiques, opérationnelles, et organisationnelles. Elles aboutissent aujourd'hui à l'adoption d'une posture résolument tournée vers la recherche d'impact et vers l'a...
Article
Full-text available
The aim of this research was to analyze greenhouse gas (GHG) emission in paddy rice–based cropping systems of the Middle Indo–Gangetic plains in India. Two paddy rice–based systems, namely paddy rice–wheat (PW) and paddy rice–potato–fallow (PP), were studied for GHG emission, net return (NR) and eco–efficiencies (EE). The PW (3354.9±133.7 kgCO2eq h...
Article
Full-text available
Global environmental degradation, and the diverse and intense interactions between irrigation and the environment, are prompting the sector to play a more active role towards sustainability. This paper builds on ICID's 2030 vision on a more sustainable irrigation sector. It recaps the various environmental impacts of irrigation systems and calls fo...
Article
The use and cost of energy in agriculture have increased, making it necessary to make current agricultural practices more energy efficient. To do this, the prevailing systems must be thoroughly analysed. Studies have focused on assessing the energy performance of individual crops, but notably few studies have investigated different cropping systems...
Article
Full-text available
Purpose The use and production of biofuels have been strongly promoted in Thailand. In order to achieve a 25 % renewable energy target in 2021, feedstock expansion is needed to satisfy the increased demand for biofuel production putting more pressure on freshwater resources. This is an important implication of biofuel production which has not yet b...
Article
Full-text available
While the world is facing unprecedented transitions and threats we need to deeply rethink the relationships between water and energy use, food production, and ecosystem protection. This includes the development and deployment of ambitious, out-of-the-box solutions towards sustainable development. This paper is based upon recent discussions before a...
Chapter
Throughout Southeast Asia, government agencies are promoting good agricultural practices (GAP) standards for improving food safety, avoiding potential nontariff barriers to exports, and ultimately securing farmers' health and revenues. This paper presents an analysis of the adoption of a public standard in Thailand, the Rice Q-GAP where Q stands fo...
Conference Paper
Global warming is a growing concern in this century. Particularly, it is imperative to identify the effects of climate change in agricultural areas. This study focuses on evaluation of climate change effect on tea (Camellia sinensis) as a major plantation crop in Sri Lanka. Geo-referenced maps of spatial and temporal changes in crop suitability and...
Conference Paper
Full-text available
Global warming is a growing concern in this century. Particularly, it is imperative to identify the effects of climate change in agricultural areas. This study focuses on evaluation of climate change effect on tea (Camellia sinensis) as a major plantation crop in Sri Lanka. Geo-referenced maps of spatial and temporal changes in crop suitability and...
Data
Abstract Global warming is a growing concern in this century. Particularly, it is imperative to identify the effects of climate change in agricultural areas. This study focuses on evaluation of climate change effect on tea (Camellia sinensis) as a major plantation crop in Sri Lanka. Geo-referenced maps of spatial and temporal changes in crop suita...
Conference Paper
Objectives: Water inventory and agri-food LCA databases do not fully support the application of LCIA methods assessing the impacts of consumptive and degradative water use (so-called water availability as proposed by Boulay and colleagues), and are not appropriate for LCA-based ecodesign of cropping systems. For herbaceous crops, the FAO Aquacrop m...
Chapter
Climate change has a profound impact on the water cycle, causing gradual and sometimes marked changes in hydrosystems and natural hydrological processes. Societies and stakeholders are striving to adapt so as to manage and control their interactions with water. Current scenarios indicate, however, an acceleration in global climate change processes,...
Article
Full-text available
Purpose Salinisation is a threat not only to arable land but also to freshwater resources. Nevertheless, salinisation impacts have been rarely and only partially included in life cycle assessment (LCA) so far. The objectives of this review paper were to give a comprehensive overview of salinisation mechanisms due to human interventions, analyse the...
Chapter
Full-text available
As one of the most comprehensive environmental assessment methodologies, life cycle assessment enables evaluation of the environmental impacts of anthropogenic activities along a supply chain. Its implementation raises many scientific questions. In the case of tropical cropping systems, researchers are working to understand and model environmental...
Research
Full-text available
This is a report by ICID task force on Financing Water for Agriculture. The report includes 1/ framework papers for financial analysis and fiscal feasibility analysis, 2/ papers on country policies and strategies, and case studies with regards to water use charges, and 3/ final recommendations
Article
Full-text available
Irrigation in Northern China is exposed to declining groundwater resources and institutional issues. As a response, authorities have developed measures that include differentiated resource allocation and charging, collective and individual water rights, a block pricing system, prepaid access to water, and real-time monitoring of resource and use. T...
Technical Report
Full-text available
The new South African water law (NWA, 1998) provides a framework for the implementation of a largely decentralized and participatory approach to water resource management. New organisations (the Catchment management agencies -CMAs, and the Water users associations -WUAs) are being established to ensure that water allocation among users at the catch...
Article
The application of irrigation water and nitrogen (N) fertilizer in excess of crop demand reduces profitability and has multiple detrimental impacts on the environment. N dynamics in agro-ecosystems are extremely complex, and mechanistic crop models are most often required to quantify the impact of improved management practices on reducing fertilize...
Article
Full-text available
This study aims to evaluate the performance of groundwater-based tube well irrigation systems of Sarlahi District in Nepal considering a water–energy–food nexus approach. The deep tube well (DTW) irrigation systems showed better performance over shallow tube well (STW) irrigation systems in terms of water supply and agricultural output per unit of...
Book
Le cycle de l'eau est profondément bouleversé par le changement climatique, qui induit des modifications progressives et parfois marquées des hydrosystèmes et des processus hydrologiques naturels. Les sociétés et les acteurs tentent de s'adapter afin de maîtriser et de contrôler leurs relations à l'eau. Cependant les scénarios actuels montrent une...
Conference Paper
Full-text available
Water has long been used by humans for transportation, water supply, agriculture, domestic use, mechanical and hydroelectric power, and economic aquatic resources. The most controversial issues in global water agenda are the construction of new dams, to improve economic and social benefits. Unfortunately, water resources development satisfied human...
Article
Full-text available
The environmental impact of imported fresh agricultural products, such as off-season vegetables transported over long distances, is under growing scrutiny. We hypothesised that the environmental Life Cycle Assessment (LCA) ranking between local and imported vegetables might change depending on the impact category considered. We focused on the case...
Conference Paper
Full-text available
Food LCA should include salinization. Salinization is a threat not only to arable land but also to freshwater resources. Nevertheless, salinization impacts have been rarely and partially included in LCA so far. First, a comprehensive overview of salinization mechanisms is presented and highlights its multiple causes, which affect soil and water, an...
Article
The proliferation of food, feed and biofuels demands promises to increase pressure on water competition and stress, particularly for Thailand, which has a large agricultural base. This study assesses the water footprint of ten staple crops grown in different regions across the country and evaluates the impact of crop water use in different regions/...
Article
Cotton cropping in Pakistan uses substantial quantities of resources and adversely affects the environment with pollutants from the inputs, particularly pesticides. A question remains regarding to what extent the reduction of such environmental impact is possible without compromising the farmers' income. This paper investigates the environmental, t...
Article
Full-text available
Northeastern Thailand is an essential production area for high-quality fragrant rice for both domestic use and export. While rain-fed conditions still largely prevail, plans to extend irrigation are being drafted. This paper compares the advantages of rice production under irrigation and rain-fed conditions in both environmental and economic terms....
Article
The functional relationship between benefit level and resource availability, which is demonstrated in a marginal benefit (MB) function but not in a total benefit (TB) function, is mostly absent in environmental valuation studies. This paper aims to establish the total and MB functions for instream water direct uses. Incomes of the beneficiaries con...
Article
Full-text available
North-eastern Thailand is an essential production area for high-quality fragrant rice for domestic use and export. While rainfed conditions largely prevail, plans to extend irrigation are drafted. This article compares paddy rice production under irrigation and rainfed conditions. Techno-economic performances were analysed jointly with environ-ment...
Article
Thailand is spending massive budgets in development and maintenance of irrigation systems for rice production. Along with tighter budgets and the ever-decreasing weight of agriculture in the domestic economy, debates are becoming more intense on the need for alternative, internalized modes of financing irrigation water supply, including farmertarge...
Article
This contribution summarizes a research done on paddy rice cropping systems in Northeastern Thailand. The assessment of eco-efficiency was performed, combining techno-economic performances and environmental impacts, using life cycle analysis.
Article
In Southeast Asia, inland fish resources are crucial for small-scale fishing households. Their decline, due to overfishing and a set of socio-ecological factors, jeopardises aquatic ecosystems and the livelihoods of fishing communities. Singkarak Lake (West Sumatra) exemplifies this sustainability challenge. The paper proposes a multi-disciplinary...
Article
Technical and socio-economic characteristics are known to determine different types of fishers and their livelihood strategies. Faced with declining fish and water resources, small-scale fisheries engage into transformations in livelihood and fishing practices. The paper is an attempt to understand these changes and their socio-economic patterns, i...
Data
Ce document de travail est destiné à servir de cadre aux études régionales qui vont se dérouler dans les différents terrains à compter du mois de mars 2010. Il sera donc repris suite à cette première mise à l’épreuve afin de fournir un cadre intégré d’analyse des situations agricoles et alimentaires au regard des enjeux du développement durable. C’...
Article
This article describes a hydrologic-economic optimization model for allocating available river flow between competing off- and in-stream demands, based on the marginal benefits (MBs) of sectoral water uses in a segment of the Teesta River in Bangladesh. Irrigation, capture fishery and navigation are the main direct water uses considered. The value...
Article
The study develops an integrated model for allocation of limited available water among competing user sectors. The model comprises a reservoir operation model (ROM) and a water allocation model (WAM). ROM determines the available water, which is used as an input to WAM. Two single and one multi-objective functions are included in the water allocati...
Article
This paper assesses the role of livelihood capital in shaping farming strategies and determining farming outcomes for smallholder rubber producers in southern Thailand. The authors find a positive relationship between the access level of livelihood capital and levels of diversification. The diversification and integration of rubber-based farming sy...
Article
Full-text available
This paper investigated the farm level diversity in operation and farm performances under two different governance situations in irrigation systems of Punjab Province of Pakistan: Farmer-Managed (FMIS) and Government-Managed Irrigation Scheme (GMIS). Questionnaire surveys and multivariate analyses were conducted. Farms typology was developed based...
Conference Paper
Full-text available
The coastal belt in the southwest region of Bangladesh is facing a very difficult situation compared to other parts of the country because of the direct interaction of the saline surface water from coastal rivers and sea with the fresh groundwater in the underlying aquifers. In this study, an integrated river-aquifer model is developed for the shal...
Article
The development of statistical relationships between local hydroclimates and large-scale atmospheric variables enhances the understanding of hydroclimate variability. The rainfall in the study basin (the Upper Chao Phraya River Basin, Thailand) is influenced by the Indian Ocean and tropical Pacific Ocean atmospheric circulation. Using correlation a...
Article
Full-text available
Cette synthèse montre l'évolution des méthodes d'évaluation dans le champ de l'agriculture irriguée, vers une tendance à des méthodologies intégrées. Elle propose quelques outils méthodologiques pour améliorer le processus d'évaluation. / Background: Irrigated agriculture is often evaluated but few reviews of evaluation methodology adapted to this...
Article
Background: Irrigated agriculture is often evaluated but few reviews of evaluation methodology adapted to this object are available in the literature. Besides, recommendations to improve evaluation in this field are lacking. Purpose: The purpose of the paper is to contribute filling this gap. Setting: Not applicable. Intervention: Not applicable. R...
Article
Full-text available
The coastal belt in the southwestern Bangladesh is facing a unique problem compared to other parts of the country because of the direct interaction of the saline surface water (SW) from the coastal rivers and nearby sea with the fresh groundwater (GW) in the underlying aquifers. In this study, an integrated river-aquifer model is developed for the...
Article
This study evaluates the potential impact of increased biofuel production on the hydrology of a small watershed, Khlong Phlo, in the eastern part of Thailand. The water footprint of biofuel energy was estimated for three crops in order to identify the most water-efficient crop. The Soil and Water Assessment Tool (SWAT) model was used to evaluate th...
Article
Studies estimating the value of irrigation water as a function of river discharge are rarely found in the literature; however, discharge-based valuation carries significance when the in- and off-stream uses are evaluated for optimal water allocation. This paper develops the total and marginal benefit functions of the key off-stream water use, irrig...
Article
This study assesses the sustainability of the Kamphaengsaen (KPP) and Phophraya (PPP) projects located in the Tha Chin Basin, Thailand. The assessment is based on the investigation of sustainability indicators using principal component analysis. The dominant indicators affecting sustainability are identified. The key indicators are weighted and com...
Article
Climate change is the main global challenge of this century; it is therefore imperative to identify its effects on agriculture in developing countries. This research makes spatial assessment of climate change effect on major plantation crops in Sri Lanka, with emphasis on crop suitability of tea, rubber, and coconut. Geo-referenced maps of spatial...
Article
The study develops a model for optimal bulk allocations of limited available water based on an economic criterion to competing use sectors such as agriculture, domestic, industry and hydropower. The model comprises a reservoir operation module (ROM) and a water allocation module (WAM). ROM determines the amount of water available for allocation, wh...
Article
Capturing the economic value of water use is an integral part in the design of economic incentives and institutional arrangements that can ensure sustainable, efficient and equitable allocation of water. Irrigation water values of small-scale irrigators are, however, seldom studied and too little attention is paid to the determinants of the variabi...
Article
Full-text available
Growing pressure on the available water resources requires a better understanding of the river flow systems in the Hari Rod River basin of Afghanistan for its effective allocation considering environmental flow requirement (EFR) by the riverine ecosystem. The present study attempts to quantify EFR for healthy ecosystem in the basin. Indicators of H...
Article
Climate change is a global challenge that has a particularly strong effect on developing countries such as Nepal, where adaptive capacity is low and where agriculture, which is highly dependent on climatic factors, is the main source of income for the majority of people. The nature and extent of the effects of climate change on rural livelihoods va...
Article
Full-text available
Climate change-related drought in recent years has emerged as a source of household-level vulnerability in rainfed hill agriculture of Nepal. The farmers cannot grow crops when there is no rainfall during the cropping season. They have weak adaptive capacity against drought due to the poor asset base and low access to services and facilities. The g...
Article
In the current global context, fossil energy consumption is a concerning feature of crop production systems. Increasing knowledge about energy use in agriculture is crucial towards reduction of the unsustainable use of limited and costly energy resources and the related greenhouse gas emissions. As part of an effort to evaluate the adaptation of di...
Chapter
Full-text available
This chapter discusses the patterns of participation that have emerged since the inception of the National Water Act of 1998 and National Water Resource Strategy of 2004 in South Africa, both of which are guided by the principles of participation, re-allocation, and decentralization. Using case studies, we identify four types of common mistakes lea...
Article
Full-text available
The local hydroclimates get impacts from the large-scale atmospheric variables via atmospheric circulation. The developing of their relationships could enhance the understanding of hydroclimate variability. This study focuses on the Upper Chao Phraya River Basin in Thailand in which rainfall is influenced by the Indian Ocean and tropical Pacific Oc...
Chapter
Satisfying the demands of freshwater for growing population, industrialization and urbanization appears to be an enormous challenge to continuing to run the economic wheel without underrnining the ecosystem needs. Environmental water allocation is widely acknowledged; however, it is implemented in few countries mainly in developed regions, even tho...
Chapter
Full-text available
The International Assessment of Agricultural Knowledge, Science, and Technology for Development (IAASTD) looks realistically at how we could effectively use agriculture/AKST to help us meet development and sustainability goals. An unprecedented three-year collaborative effort, the IAASTD involved more than 400 authors in 110 countries and cost more...
Article
Full-text available
ABSTRACT Insight into the value of water is essential to support policy decision making about investments in the water sector, efficient allocation of water and water pricing. However, information on irrigation water values at small-scale schemes is scarce and in general little attention is paid to the determinants of these values. In this study va...