Importance of overlooked crop biomass components in sugarcane nitrogen nutrition studies

Poultney Daniel, Thuries Laurent, Versini Antoine. 2024. Importance of overlooked crop biomass components in sugarcane nitrogen nutrition studies. Nitrogen, 5 (2) : 62-78.

Résumé : Sugarcane crops typically have a high fertiliser nitrogen (N) input, with low N recovery efficiencies. Nitrogen is essential to crop productivity, but excess application can have negative environmental consequences. Despite the importance of coordinating N fertiliser input with crop N requirements, certain components of the sugarcane plant are typically not considered when evaluating N nutrition. The objective of this study was to establish which sugarcane crop components should be included in these evaluations given their impact on N mass accumulation and on fertiliser N recovery efficiencies. The respective biomass, N mass, and fertiliser N recovery efficiency were evaluated for sugarcane shoots, tillers, strawfall, root, and stool components over two experimental years, for fertilised (urea) and unfertilised treatments. The root component comprised, respectively, 57–65% of the aboveground N mass of fertilised sugarcane, and 74–104% of the unfertilised sugarcane. The sugarcane N requirements and uptake were shown to be more progressive over the growth-cycle when considering the strawfall and tiller components. This study emphasises the importance of evaluating belowground biomass in sugarcane N studies, and suggests that the tiller and strawfall components should also be considered when evaluating the evolution of N mass and fertiliser N recovery efficiency.

Mots-clés Agrovoc : croissance de la plante, nutrition des plantes, biomasse, canne à sucre, agroécosystème, marcottage par buttage, Saccharum, Saccharum officinarum

Mots-clés géographiques Agrovoc : France, La Réunion

Mots-clés libres : Nitrogen, N-fertiliser recovery efficiency, SUGARCANE, Roots, Strawfall, Tillers

Classification Agris : F61 - Physiologie végétale - Nutrition
F04 - Fertilisation

Champ stratégique Cirad : CTS 2 (2019-) - Transitions agroécologiques

Agences de financement européennes : European Commission

Agences de financement hors UE : Conseil Régional de La Réunion, Ministère français de l'Agriculture et de la l'Alimentation

Projets sur financement : (REU) Services et impacts des activités agricoles en milieu tropical

Auteurs et affiliations

• Poultney Daniel, CIRAD-PERSYST-UMR Eco&Sols (FRA) - auteur correspondant
• Thuries Laurent, CIRAD-PERSYST-UPR Recyclage et risque (FRA) ORCID: 0000-0002-1365-7891
• Versini Antoine, CIRAD-PERSYST-UPR Recyclage et risque (REU) ORCID: 0000-0002-5119-0567 - auteur correspondant

Source : Cirad-Agritrop (https://agritrop.cirad.fr/608927/)

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