T9ML3YXJ

2666

19 novembre 2020 12:02

19 novembre 2020 12:02

Les systèmes de polyculture-élevage peuvent utiliser les complémentarités entre les cultures et l’élevage pour réduire leur consommation d’intrants. Dans quatre régions françaises, des réunions d’experts ont été organisées pour discuter de l’évolution possible de ces systèmes selon trois scénarios prospectifs contrastés : « Ultra-libéralisation et mondialisation galopante » (S1), « Économie territoriale et recentrage sur la qualité » (S2) et « Transition agroécologique et énergétique » (S3) et pour réfléchir aux modalités possibles pour soutenir la polyculture-élevage dans chacun des scénarios. Pour appuyer ces discussions, les impacts des éléments structurants des scénarios ont été simulés à l’aide du modèle bioéconomique Orfee pour une ferme type de culture-élevage de chaque région. Les experts s’accordent pour dire que le S1 irait vers une réduction de l’élevage et une plus grande spécialisation en grandes cultures, que le S2 serait le plus favorable à des systèmes diversifiés et que le S3 induirait une baisse de l’élevage, mais une intégration plus forte entre élevage et cultures. Les résultats des simulations vont dans le même sens, excepté pour la production laitière qui augmente dans le S1 en raison de la prévision d’une augmentation du prix du lait et d’une main-d’œuvre non limitante. Les simulations ont permis de calculer des indicateurs de durabilité : S1 est supérieur pour les indicateurs économiques, S2 meilleur pour les indicateurs sociaux et S3 plus favorable à l’environnement. Les simulations soulignent également la nécessité de maintenir l’élevage dans une transition agroécologique pour réduire les engrais minéraux et les pesticides. , Crop-livestock systems can use complementarities between crops and livestock to reduce their input consumption. In four French regions, expert meetings were organized to discuss the possible evolution of these systems according to three contrasting prospective scenarios: “Ultra-liberalization and globalization” (S1), “Territorial economy and refocusing on quality” (S2) and “Agro-ecological and energy transition” (S3), and to reflect on possible modalities to support crop-livestock systems in each of the scenarios. To support these discussions, the impacts of the structuring elements of the scenarios were simulated using the Orfee bio-economic model for a typical crop-livestock farm in each region. The experts agreed that S1 would lead to a reduction in livestock production and greater specialization in field crops, S2 would be the most favourable to diversified systems and S3 would lead to a reduction in livestock production, but with greater integration between livestock and crops. The results of the simulations go in the same direction, except for milk production, which increases in S1 due to the forecast increase in milk prices and non-limiting labour force. The simulations were used to calculate sustainability indicators: S1 is better for economic indicators, S2 better for social indicators and S3 more favourable to the environment. The simulations also highlight the need to maintain livestock farming in an agro-ecological transition to reduce mineral fertilizers and pesticides.

Mixed crop-livestock systems can use complementarities between crops and livestock to reduce their input consumption. In four French regions, expert meetings have been organized to discuss the possible evolution of these systems according to three prospective scenarios contrastés : " Ultra-liberalization and globalization galopante ". (S1), " Économie territorial and refocusing on qualité ". (S2) and " Transition agro-ecological and énergétique ". (S3) and to reflect on possible ways to support polyculture-livestock in each of the scenarios. To support these discussions, the impacts of the structuring elements of the scenarios were simulated using the Orfee bio-economic model for a typical crop-livestock farm in each region. The experts agreed that S1 would lead to a reduction in livestock and greater specialization in field crops, that S2 would be most favorable to diversified systems and that S3 would lead to a decrease in livestock, but a stronger integration between livestock and crops. The results of the simulations go in the same direction, except for milk production which increases in S1 due to the prediction of an increase in milk price and an unlimited labour force. Simulations have calculated indicators from durabilité : S1 is higher for economic indicators, S2 is better for social indicators and S3 is more favorable to the environment. The simulations also highlight the need to maintain livestock in an agro-ecological transition to reduce mineral fertilizers and pesticides. , Crop-livestock systems can use complementarities between crops and livestock to reduce their input consumption. In four French regions, expert meetings were organized to discuss the possible evolution of these systems according to three contrasting prospective scenarios: "Ultra-liberalization and globalization" (S1), "Territorial economy and refocusing on quality" (S2) and "Agro-ecological and energy transition" (S3), and to reflect on possible modalities to support crop-livestock systems in each of the scenarios. To support these discussions, the impacts of the structuring elements of the scenarios were simulated using the Orfee bio-economic model for a typical crop-livestock farm in each region. The experts agreed that S1 would lead to a reduction in livestock production and greater specialization in field crops, S2 would be the most favourable to diversified systems and S3 would lead to a reduction in livestock production, but with greater integration between livestock and crops. The results of the simulations go in the same direction, except for milk production, which increases in S1 due to the forecast increase in milk prices and non-limiting labour force. The simulations were used to calculate sustainability indicators: S1 is better for economic indicators, S2 better for social indicators and S3 more favourable to the environment. The simulations also highlight the need to maintain livestock farming in an agro-ecological transition to reduce mineral fertilizers and pesticides.

None

• AB - Modalité bio
• FREDO aspect technico-économique
• FREDO fertilisation
• GEO France
• mixte

Cahiers Agricultures

29

30

2020

1 janvier 2020

10.1051/cagri/2020028 Le DOI est une URL unique de référencement d'une publication. Il est donc plus fiable et permanent qu'une URL classique

1166-7699, 1777-5949 L’ISSN est un code de 8 chiffres servant à identifier les journaux, revues, magazines, périodiques de toute nature et sur tous supports, papier comme électronique.