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Functional relationship between sugarcane root biomass and length for cropping system applications

Chopart Jean-Louis, Azevedo M.C.B., Le Mezo Lionel, Marion Daniel. 2010. Functional relationship between sugarcane root biomass and length for cropping system applications. In : ISSCT 2010: 27th Congress of the International Society of Sugar Cane Technologists Congres, Veracruz, Mexique, 7-11 mars 2010. ISSCT. s.l. : s.n., 8 p. ISSCT Congress. 27, Veracruz, Mexique, 7 March 2010/11 March 2010.

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Titre espagnol : Relacion funcional entre biomasa y longitud de raices para aplicationes en el sistema de cultivo de la caña de azucar / Titre français : Relation fonctionnelle enter la biomasse et la longueur racinaire de la canne à sucre pour des applications à l'étude des systèmes de culture

Abstract : Sugarcane root length density (RLD, m/m3) and root biomass are key characteristics for respectively determining: (i) the crop nutrient and water uptake capacity, and (ii) carbon partitioning in plants and balance in soil. In previous studies, often only one of these parameters was measured. It is therefore useful to link the RLD and root biomass density (RBD, g/m3) to evaluate one parameter in relation to the other. Relationships between RLD and RBD and specific root length (SRL, m/g) were studied in Côte d'Ivoire and Réunion. Mean SRLs of fine roots were independent of the root location in the soil profile and plant age but higher in Côte d'Ivoire (68 m/g, SD = 19) than in Réunion (35 m/g, SD = 10). The best fit between the RBD and RLD of thick roots was a power function (RLD = 21.3 RBD*0.745; R2 = 0.85). Mean SRL was 7 m/g. When all roots were studied together, the best fit between RBD and RLD was also a power function, with little variation between the two sites or between plant and ratoon sugarcane. The fits calculated with all data except those obtained very close to the plant stem were: RLD = 85.5 RBD*0.742 (R2 = 0.88) and mean SRL = 27 m/g (SD =13). Relationships between root length and biomass were neither fixed nor fully random. Due to SRL variability, it was hard to pinpoint any mechanistic links between root length and biomass. Conversely, for simple field evaluations, a rough and ready RLD estimate can be made on the basis of RBD, and vice-versa. (Résumé d'auteur)

Mots-clés Agrovoc : Saccharum officinarum

Mots-clés géographiques Agrovoc : Réunion, Côte d'Ivoire

Classification Agris : F62 - Plant physiology - Growth and development
F01 - Crop husbandry

Auteurs et affiliations

  • Chopart Jean-Louis, CIRAD-PERSYST-UPR SCA (REU)
  • Azevedo M.C.B., IAPAR (BRA)
  • Le Mezo Lionel, CIRAD-PERSYST-UPR SCA (REU)
  • Marion Daniel, CIRAD-PERSYST-UPR SCA (REU)

Autres liens de la publication

Source : Cirad - Agritrop (https://agritrop.cirad.fr/554615/)

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