Development of direct sowing and mulching techniques as alternatives to slash-and-burn systems in northern Vietnam

Husson Olivier, Lienhard Pascal, Séguy Lucien, Tuan Ha Dinh, Doanh Le Quoc. 2001. Development of direct sowing and mulching techniques as alternatives to slash-and-burn systems in northern Vietnam. In : Conservation agriculture, a worldwide challenge : Ist World congress on conservation agriculture. Garcia-Torres Luis (ed.), Benites José (ed.), Martinez-Vilela Armando (ed.). ECAF, FAO. Cordoba : XUL, 29-33. ISBN 84-932237-0-0 Congrès mondial d'agriculture de conservation. 1, Madrid, Espagne, 1 Octobre 2001/5 Octobre 2001.

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Résumé : In the mountains of northern Vietnam, because of increasing population and cattle pressure, the traditional slash-and-burn systems are no longer sustainable. Their main limitations were identified as: very poor water use efficiency, rapid soil degradation and high weed pressure. Since 1999, VASI and CIRAD conduct apply research to adapt direct sowing techniques to local conditions, with promising preliminary results. In upland rice fields usually abandoned by farmers, several low input systems produce 1.5 to 2 t/ha, i.e. more than yield achieved immediately after forest reclamation with traditional techniques. Crops are sown directly in a dead mulch, after soil structure and fertility have been improved by plants with strong root systems and high biomass production or through slow soil cooking (ecobuage). Weeding time is dramatically reduced as most weeds are controlled by the mulch. Alternatives to slash-and-burn already can be proposed to farmers in critical situations.

Mots-clés Agrovoc : semis direct, riz pluvial, mulch sec, région d'altitude, facteur lié au site, rendement des cultures

Mots-clés géographiques Agrovoc : Viet Nam

Mots-clés complémentaires : Diagnostic agronomique, Écobuage

Classification Agris : F07 - Façons culturales
F08 - Systèmes et modes de culture

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