Effect of deficiencies and excesses of phosphorus, potassium and boron on the physiology and growth of avocado (Persea americana, cv. Hass) plants

In order to observe the effects of nutrients: potassium (K), boron (B) and phosphorus (P), on physiological and growth variables in avocado var. Hass, seven treatments and four repetitions with three dose levels were evaluated: (1) deficiency of the respective element: 50% or half of the complete fertilization, (2) complete or control treatment: 100%, and (3) excess of the respective element, 150% above the complete fertilization, arranged in a completely random design. The plants were grown in polyethylene bags with soil and cultivated under greenhouse conditions; weekly fertilization and irrigation were also carried out. The evaluated variables included leaf area (LA), number of leaves (NL), relative chlorophyll content (CC), maximum photochemical efficiency of PSII (Fv/Fm) and transpiration (E); the symptomatology of deficiencies and excesses were described in the leaves. The LA, NL and CC values were lower in relation to the control. Similarly, the Fv/Fm and E were lower compared to the control, suggesting probable stress caused by the treatments, presenting a greater proportion of P, followed by K and B. The visual signs of nutrient stress were observed more clearly in the plants subjected to deficiency than in those subjected to excess, consistent with what has been reported for this variety.

• Tipo de recurso: http://purl.org/coar/resource_type/c_6598
• Fecha de publicación: 2018
• Institución: Universidad Pedagógica y Tecnológica de Colombia
• Repositorio: RiUPTC: Repositorio Institucional UPTC
• Idioma: spa
• OAI Identifier: oai:repositorio.uptc.edu.co:001/16849
• Acceso en línea: https://revistas.uptc.edu.co/index.php/ciencias_horticolas/article/view/8092; https://repositorio.uptc.edu.co/handle/001/16849
• Palabra clave: Mineral nutrition; Leaf area; Chlorophyll fluorescence; Transpiration; Deficiency and excess symptoms; Fruits; Fruits; Avocado; Nutritional deficiencies; Nutrición mineral; Área foliar; Fluorescencia de la clorofila; Transpiración; Síntomas de deficiencia y exceso; Frutales; Frutales; aguacate; deficiencias nutricionales; Nutrition minérale; Zone de la feuille; Fluorescence de chlorophylle; Transpiration; Carence et symptômes excessifs; Fruits; Arbres fruitiers; Avocat; Carences nutritionnelles; Nutrizione minerale; Area fogliare; Fluorescenza della clorofilla; Traspirazione; Carenza e sintomi in eccesso; Frutta; Alberi da frutto; Avocado; Carenze nutrizionali; Nutrição mineral; Área da folha; Fluorescência de clorofila; Transpiração; Deficiência e sintomas excessivos; Frutas; Árvores frutíferas; Abacate; Deficiências nutricionais
• License: https://creativecommons.org/licenses/by-nc/4.0/