Influence of potassium and sodium nutrition on leaf area components in Eucalyptus grandis trees

Battie Laclau Patricia, Laclau Jean-Paul, De Cassia Piccolo Marisa, Cersózimo Arenque Bruna, Beri Constance, Mietton Lauriane, Almeida Muniz Marta R., Jordan-Meille Lionel, Silveira Buckeridge Marco, Nouvellon Yann, Ranger Jacques, Bouillet Jean-Pierre. 2013. Influence of potassium and sodium nutrition on leaf area components in Eucalyptus grandis trees. Plant and Soil, 371 (1-2) : 19-35.

https://doi.org/10.1007/s11104-013-1663-7

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Quartile : Q1, Sujet : AGRONOMY / Quartile : Q1, Sujet : SOIL SCIENCE / Quartile : Q1, Sujet : PLANT SCIENCES

Résumé : Background and Aims Recent studies showed a positive tree response to Na addition in K-depleted tropical soils. Our study aimed to gain insight into the effects of K and Na fertilizations on leaf area components for a widely planted tree species. Methods Leaf expansion rates, as well as nutrient, polyol and soluble sugar concentrations, were measured from emergence to abscission of tagged leaves in 1-year-old Eucalyptus grandis plantations. Leaf cell size and water status parameters were compared 1 and 2 months after leaf emergence in plots with KCl application (+K), NaCl application (+Na) and control plots (C). Results K and Na applications enhanced tree leaf area by increasing both leaf longevity and the mean area of individual leaves. Higher cell turgor in treatments +K and +Na than in the C treatment resulting from higher concentrations of osmotica contributed to increasing both palisade cell diameters and the size of fully expanded leaves. Conclusions Intermediate total tree leaf area in treatment +Na compared to treatments C and +K might result from the capacity of Na to substitute K in osmoregulatory functions, whereas it seemed unable to accomplish other important K functions that contribute to delaying leaf senescence.

Mots-clés Agrovoc : Eucalyptus grandis, plantation forestière, fertilisation, potassium, sodium, surface foliaire, analyse de tissu foliaire, croissance, fertilité du sol

Mots-clés géographiques Agrovoc : Brésil

Classification Agris : K10 - Production forestière
F62 - Physiologie végétale - Croissance et développement
F04 - Fertilisation

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

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