Early effects of conservation agriculture on soil organic carbon dynamics of Mollisols in Cambodia
2023
Koun, Pengly | Vernet, Pierre‐Antoine | Filloux, Titouan | Sar, Veng | Seng, Vang | Srimongkol, Porntip | Tantachasatid, Phakphoom | Sen, Reaksmey | Pheap, Sambo | Tivet, Florent | Thoumazeau, Alexis | Royal University of Agriculture (RUA) | Agroécologie et Intensification Durables des cultures annuelles (UPR AIDA) ; Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad) | Département Performances des systèmes de production et de transformation tropicaux (Cirad-PERSYST) ; Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad) | Department of Agricultural Land Resources Management, General Directorate of Agriculture, Phnom Penh | Kasetsart University (KU) | Faculty of Natural Resources and Agro- Industry ; Kasertsart University | Agrosystèmes Biodiversifiés (UMR ABSys) ; Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre International de Hautes Etudes Agronomiques Méditerranéennes - Institut Agronomique Méditerranéen de Montpellier (CIHEAM-IAMM) ; Centre International de Hautes Études Agronomiques Méditerranéennes (CIHEAM)-Centre International de Hautes Études Agronomiques Méditerranéennes (CIHEAM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut Agro Montpellier ; Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro) | DP-Hevea Research Platform in Partnership (HRPP) ; Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad) | Agence Francaise de Developpement | Southeast Asian Regional Center for Graduate Study and Research in Agriculture | United States Agency for International Development
International audience
Show more [+] Less [-]English. Cambodia has faced drastic agrarian changes over the last twenty years with a rapid and massive transformation of the uplands from forest into arable land. Soil quality depletion is one of the main drivers of the resulting decline in crop productivity and increasing production costs in the uplands of Battambang province. The objective of the study was to assess the early effects of conventional plough-based (20 cm) management (CT) and two conservation agriculture-based (CA) cropping systems (the use of a single—CAS vs. multiple cover crop species—CAM) on a maize monocropping system using three soil organic carbon (SOC) fractions on Mollisols in Battambang province. SOC content, permanganate oxidizable carbon (POXC) and soil CO2 basal respiration through SituResp® were recorded at a depth of 0–10 cm. Twelve sampling periods were used over the growth period of the cover crops and during the maize cycle. POXC and SituResp® were highly sensitive to management practices with, across the 12 sampling periods, higher values (p < .05) under CA than CT, with an average increase of 6% and from 20% to 23%, respectively. No difference was observed in SOC content between the practices in our sampling periods. Seasonal variations were observed in both POXC and SituResp®. POXC underwent larger fluctuations following critical weather events than SituResp®. This study showed that POXC and SituResp® were rapidly sensitive to changes in agricultural management practices. POXC and SituResp® are largely influenced by seasonality and could help clarify the impact of weather patterns on soil C dynamics.
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Bibliographic information
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