1. Modelling nitrogen and light sharing in pea-wheat intercrops to design decision rules for N fertilisation according to farmers’ expectations
- Author
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Christophe Naudin, Marie-Hélène Jeuffroy, Mathilde Sester, Guénaëlle Corre-Hellou, Philippe Malagoli, Sylvain Vrignon-Brenas, Laboratoire de Physique et Physiologie Intégratives de l’Arbre en environnement Fluctuant - Clermont Auvergne (PIAF), Institut National de la Recherche Agronomique (INRA)-Université Clermont Auvergne (UCA), Ecole supérieure d'Agricultures d'Angers (ESA), Écophysiologie des Plantes sous Stress environnementaux (LEPSE), Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut National de la Recherche Agronomique (INRA)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro), Agroécologie et Intensification Durables des cultures annuelles (UPR AIDA), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad), Agronomie, AgroParisTech-Université Paris-Saclay-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), This work was jointly funded by ADEME (Agence de l’Environnement et de la Maîtrise de l’Énergie, France), CASDAR n°431 (Compte d'Affectation Spéciale pour le Développement Agricole et Rural, France), Conseil Général of Maine-et-Loire, and UNIP (Union National des plantes riches en Protéines, France)., Légumineuses, Ecophysiologie Végétale, Agroécologie (LEVA), Ecole supérieure d'Agricultures d'Angers (ESA)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Département Performances des systèmes de production et de transformation tropicaux (Cirad-PERSYST), CASDAR n°431 (Compte d'Affectation Spéciale pour le Développement Agricole et Rural, France), Conseil Général of Maine-et-Loire, UNIP (Union National des plantes riches en Protéines, France)., and ADEME (Agence de l’Environnement et de la Maîtrise de l’Énergie, France)
- Subjects
0106 biological sciences ,[SDV.SA]Life Sciences [q-bio]/Agricultural sciences ,Light ,Disponibilité nutriments (sol) ,Agricultural engineering ,01 natural sciences ,Climatic data ,Triticum ,media_common ,Mathematics ,2. Zero hunger ,biology ,U10 - Informatique, mathématiques et statistiques ,Intercropping ,04 agricultural and veterinary sciences ,Nitrogen ,Variable (computer science) ,[SDE]Environmental Sciences ,Intercrop ,Interception ,media_common.quotation_subject ,Soil Science ,chemistry.chemical_element ,Lumière ,Competition (biology) ,Fertilisation ,Culture intercalaire ,Scenarios ,Pisum sativum ,Modélisation des cultures ,Engrais azoté ,Climatic variability ,Decision rule ,15. Life on land ,biology.organism_classification ,chemistry ,040103 agronomy & agriculture ,0401 agriculture, forestry, and fisheries ,Agronomy and Crop Science ,010606 plant biology & botany ,F04 - Fertilisation - Abstract
International audience; Cereal-legume intercropping has gained increased interest in Europe. Nevertheless, performance and especially the percentage of each species at harvest are often considered highly variable. Nitrogen (N) fertilisation can be a relevant driving factor affecting the percentage of each species at harvest. Soil N availability influences competition for light and nitrogen in cereal-legume intercrops. However, management of N fertilisation still remains unclear for intercrops. Few references on the effects of a range of strategies of N fertilisation are available to guide farmers with relevant decision rules considering their expectations. Here, a modelling approach was proposed to simulate interactions between light and N acquisition of a pea-wheat intercrop and to test different scenarios for the management of such intercrops. A model (Azodyn-IC) was built resulting from the combination of two existing individual-crop models (AZODYN and AFISOL) and by applying rules of light and soil inorganic nitrogen sharing between the intercropped pea and wheat. Evaluation of the model outputs with experimental data showed satisfactory predictions of the studied variables (N accumulation, LAI, and crop dry weight). The model validated both resource sharing and light-N interactions. Furthermore, the model was able to respond to increases in inorganic N availability based upon straightforward formalisms. Simulating unmeasured variables, such as root growth and light interception and use by each species, improved our understanding of the relative dominance of each species for acquiring resources. Eventually, the model was used to simulate different scenarios of N fertilisation over 26 years of climatic data to account for climatic variability. We demonstrated the interest of such a modelling approach to design decision rules of N fertilisation according to farmers’ expectations.
- Published
- 2020