Uses, toxicity levels, and environmental impacts of synthetic and natural pesticides in rice fields – a survey in Central Thailand

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Ressource 1Télécharger: Uses toxicity levels and environmental impacts of synthetic and natural pesticides in rice fields a survey in Central Thailand.pdf (1124.13 [Ko])
Etat: Public
Version: Final published version
ID Serval
serval:BIB_EB93FCFAAF86
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Uses, toxicity levels, and environmental impacts of synthetic and natural pesticides in rice fields – a survey in Central Thailand
Périodique
International Journal of Biodiversity Science, Ecosystem Services & Management
Auteur⸱e⸱s
Maneepitak S., Cochard R.
ISSN
2151-3732
2151-3740
Statut éditorial
Publié
Date de publication
03/04/2014
Peer-reviewed
Oui
Volume
10
Numéro
2
Pages
144-156
Langue
anglais
Résumé
[Full article freely available at: http://www.tandfonline.com/doi/abs/10.1080/21513732.2014.905493].
Nowadays, pesticides are used pervasively in Asian rice production areas. Nonetheless, information is scarce regarding chemicals’ application and synergistic toxicity and longer-term impacts on paddy ecosystems. In Phranakhon Si Ayutthaya and Ang Tong (AT) provinces, 40 conventionally and 31 organically managed farms were visited. The farmers provided information on types and levels of pesticides used, and indices describing pesticide ‘toxic exposures’ were calculated. In the dry and wet seasons, the fields were surveyed for soil organic carbon (OC) and nitrogen (N) and rice densities and sizes. Using multivariate statistics, interrelationships among variables were investigated. Overall, 12 types of herbicides (all synthetic), 27 insecticides (13 natural), and 6 molluscicides (1 natural) were recorded. Pesticide exposures differed between provinces; organic farms used more natural products. OC was positively correlated with ‘toxic exposure’ levels, probably resulting from effects of pesticides on carbon-reducing processes. Additionally, molluscicides and herbicides explained OC levels. N varied spatially, probably resulting from flooding regimes; management influences were unnoticeable. In the dry season, rice growth was decreased on fields exposed to plentiful synthetic insecticides, whereas in the wet season, use of herbicides and molluscicides enhanced the growth. Further research is advisable to better establish long-term costs and benefits of different pesticide regimes in rice fields.
Mots-clé
insecticides, herbicides, synthetic and natural chemicals, pesticide regimes, organic farming, soil carbon, rice establishment and growth
Open Access
Oui
Création de la notice
05/02/2018 16:28
Dernière modification de la notice
20/08/2019 16:13
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