Boll distribution patterns in bt and non-bt cotton cultivars: ii. study on small-scale farming systems in south africa

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Article de revue scientifique de J. Hofs and M. Fok and D. Marais - 2006

  • Référence bibliographique
  • Année de publication
  • 2006
  • Auteur(s)
  • J. Hofs and M. Fok and D. Marais
  • Titre du document
  • Boll distribution patterns in bt and non-bt cotton cultivars: ii. study on small-scale farming systems in south africa
  • Titre en anglais
  • Boll distribution patterns in bt and non-bt cotton cultivars: ii. study on small-scale farming systems in south africa
  • Adresse email de l'auteur
  • hofs@cirad.fr
  • Journal ou Magazine
  • Field Crop Research
  • Numéros de pages
  • 2/3
  • Volume
  • 98
  • Pays concerné(s)
  • Afrique du Sud
  • Thésaurus associé(s)
  • Colire
  • Mots-clé(s) Colire
  • Facteur biotechno des coûts de production
    Conditions d'utilisation des semences GM
    OGM et utilisation d'insecticides
    Fréquence des épandages insecticides
    Coût du contrôle des ravageurs
    Coton Bt
    Évolution de l'utilisation des pesticides
    Changement dans les quantités de pesticides
  • Enregistré le
  • 2011-12-14
  • Modifié le
  • 2011-12-14
  • Administré par
  • Fok Michel
  • Résumé
  • The introduction of Bt cotton in small-scale African farming systems raises the question of the technological efficacy of such cultivars in. low-input rainfed agriculture conditions. Current surveys on Bt cotton in small-scale farming systems in South Africa suggest this transgenic. crop is a key factor for increasing yields and farm income. This study was designed to assess the efficacy of the Bt cultivar under non-optimal. conditions that prevail on small-scale farms. We thus carried out a 2-year comparative study on yield performances and boll distribution. patterns of Bt and non-Bt cotton in 20 small-scale fields around Makhathini Flats (KwaZulu Natal, South Africa). A survey was also. conducted on 86 farms to obtain yield results in a broader sample. In small-scale, low-input rainfed farming systems, productivity is extremely. variable and the advantage of transgenic cotton over conventional varieties is not as easy to demonstrate as it is in large-scale, high-input. irrigated farming systems. Given the high technological cost, adoption of transgenic crops may sometimes have a negative economic impact. for farmers. Nevertheless, the use of transgenic varieties may be effective within the framework of an overall cropping intensification strategy,. i.e. as an integrated pest management component and accompanied by fertilizer application and weed management recommendations.