With sub-optimum conditions the current representation of potential crop development patterns needs to be reconsidered

Clouvel Pascal, Lecoeur Jérémie, Gérardeaux Edward, Luquet Delphine, Rey Hervé, Martin Pierre. 2008. With sub-optimum conditions the current representation of potential crop development patterns needs to be reconsidered. European Journal of Agronomy, 28 (3) : 266-272.

Résumé : Most current process-based crop models use "de Wit"representation, whereby different types of stress reduce a potential plant development pattern that solely depends on the variety, temperature and radiation. That approach was largely validated for conventional agriculture and the corresponding range of environmental conditions. The aim of our study was to test the robustness of that representation under early sub-optimum growth conditions. Investigations were carried out on cotton in southern France under controlled glasshouses and field conditions. We analysed the effects of light interception, water supply and planting density on the node appearance pattern of the plant's main stem.Early stress on seedlings and a variation in planting density induced a plant reaction that could not be properly taken in account by common "de Wit" representation. First, delays in potential pattern establishment after emergence were observed with PARi values under 0.15 mol plant-1 d-1. Furthermore, early low PARi and drastic water stress (FTSW < 0.25) affected the node initiation rate once 10 nodes had already been initiated. Subsequently, given node appearance rate (NAR) dependency on the initiation rate, the indirect impact of past conditions on seedlings might affect the potential development pattern during transition from the vegetative to the reproductive phase. Lastly, under stress-free conditions, planting density was shown to affect potential development patterns.

Mots-clés Agrovoc : modélisation des cultures, modèle de simulation, stress, Gossypium, développement biologique, densité de semis, régime lumineux, stress dû à la sécheresse, approvisionnement en eau

Classification Agris : F62 - Physiologie végétale - Croissance et développement
U10 - Informatique, mathématiques et statistiques
F01 - Culture des plantes

Champ stratégique Cirad : Axe 1 (2005-2013) - Intensification écologique

Auteurs et affiliations

• Clouvel Pascal, CIRAD-PERSYST-UPR Qualité du coton (FRA)
• Lecoeur Jérémie, INRA (FRA)
• Gérardeaux Edward, CIRAD-PERSYST-UPR Systèmes cotonniers (FRA) ORCID: 0000-0003-1487-4887
• Luquet Delphine, CIRAD-BIOS-UPR Modélisation intégrative (FRA) ORCID: 0000-0002-2543-7140
• Rey Hervé, CIRAD-BIOS-UMR AMAP (FRA)
• Martin Pierre, CIRAD-PERSYST-DIR (FRA) ORCID: 0000-0002-4874-5795

Source : Cirad - Agritrop (https://agritrop.cirad.fr/543229/)

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