| Titre : |
The impact of pesticides on ricefield vertebrates with emphasis on fish |
| Type de document : |
texte imprimé |
| Auteurs : |
A.G. Cagauan, Auteur |
| Importance : |
p 203-248 |
| Langues : |
Anglais (eng) |
| Catégories : |
SCIENCES AGRICOLES
|
| Mots-clés : |
IMPACT DES PESTICIDES UTILISATION DES PESTICIDES RIZIERE METHODOLOGIE D'EVALUATION ANALYSE DES RESIDUS DES PESTICIDES INSECTICIDES |
| Résumé : |
Production of fish on rice farms in Asian countries is considered by policymakers as a viable option for sustaining food production in lowland areas, augmenting farm income and improving the quality of food available to asian farm housholds. Rice-fish farming systems hence represent an ideal practice for more efficient utilization of agricultural resources in lowland rice areas.
The use of pesticides has been reported to have caused a decline in the practice of rice-fish culture in some parts of Central Thailand. Annual application of around 2kg per hectare of insecticide was reported to have caused financial losses in rice-fish culture in Indonesia.
Rice-fish farming in the Philippines was introduced only in 1974 and is still at the experimental (field-testing and verification) stage. Its small-scale adoption is influenced by technological and social constraints such as the use of high-yielding varieties associated with indiscriminate use of pesticides and shorter rice production cycle resulting in smaller fish size at harvest, unavailability of fingerlings, inadequate water supply, fish poaching and the risk-averse attitude of most rice farmers.
The two main constraints to increased productivity in irrigated rice-fish farming systems however, are water control and pesticide use. The latter is considered the more serious constraint because it can be justified in areas where potential rice yields are also high.
Since fish must adapt to management practices for rice, information on toxicity, degradation and residues of pesticides in fish are imerative for the development of a better symbiotic relationship between rice and fish in an integrated farming system. Acute toxicity parameter LC50² provides information on the effect of pesticides in extreme conditions and may serve as a basis for field application rates safe for fish. Degradation period of pesticides meanwhile indicate the safe period to stock fish. Pesticide residue data in fish are few but remain essential for the safe use of pesticides in rice-fish culture. These information are presented and reviewed in Cagauan and Arce and will be used in subsequent discussions. |
| Numéro du document : |
A 6290/H00 366 |
| Niveau Bibliographique : |
2 |
| Bull1 (Theme principale) : |
FORESTERIE |
| Bull2 (Theme secondaire) : |
GENIE FORESTIER |
The impact of pesticides on ricefield vertebrates with emphasis on fish [texte imprimé] / A.G. Cagauan, Auteur . - [s.d.] . - p 203-248. Langues : Anglais ( eng)
| Catégories : |
SCIENCES AGRICOLES
|
| Mots-clés : |
IMPACT DES PESTICIDES UTILISATION DES PESTICIDES RIZIERE METHODOLOGIE D'EVALUATION ANALYSE DES RESIDUS DES PESTICIDES INSECTICIDES |
| Résumé : |
Production of fish on rice farms in Asian countries is considered by policymakers as a viable option for sustaining food production in lowland areas, augmenting farm income and improving the quality of food available to asian farm housholds. Rice-fish farming systems hence represent an ideal practice for more efficient utilization of agricultural resources in lowland rice areas.
The use of pesticides has been reported to have caused a decline in the practice of rice-fish culture in some parts of Central Thailand. Annual application of around 2kg per hectare of insecticide was reported to have caused financial losses in rice-fish culture in Indonesia.
Rice-fish farming in the Philippines was introduced only in 1974 and is still at the experimental (field-testing and verification) stage. Its small-scale adoption is influenced by technological and social constraints such as the use of high-yielding varieties associated with indiscriminate use of pesticides and shorter rice production cycle resulting in smaller fish size at harvest, unavailability of fingerlings, inadequate water supply, fish poaching and the risk-averse attitude of most rice farmers.
The two main constraints to increased productivity in irrigated rice-fish farming systems however, are water control and pesticide use. The latter is considered the more serious constraint because it can be justified in areas where potential rice yields are also high.
Since fish must adapt to management practices for rice, information on toxicity, degradation and residues of pesticides in fish are imerative for the development of a better symbiotic relationship between rice and fish in an integrated farming system. Acute toxicity parameter LC50² provides information on the effect of pesticides in extreme conditions and may serve as a basis for field application rates safe for fish. Degradation period of pesticides meanwhile indicate the safe period to stock fish. Pesticide residue data in fish are few but remain essential for the safe use of pesticides in rice-fish culture. These information are presented and reviewed in Cagauan and Arce and will be used in subsequent discussions. |
| Numéro du document : |
A 6290/H00 366 |
| Niveau Bibliographique : |
2 |
| Bull1 (Theme principale) : |
FORESTERIE |
| Bull2 (Theme secondaire) : |
GENIE FORESTIER |
|  |
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