Effects of foliar application of a byproduct of the two-step olive oil mill process on maize yield

Issue		Agron. Sustain. Dev. Volume 23, Number 7, November 2003


Page(s)		617 - 623
DOI		10.1051/agro:2003041

Agronomie 23 (2003) 617-623
DOI: 10.1051/agro:2003041

Effects of foliar application of a byproduct of the two-step olive oil mill process on maize yield

Manuel Tejada^a and José Luis Gonzalez^b

^a Departamento de Cristalografía, Mineralogía y Química Agrícola, E.U.I.T.A., Universidad Sevilla, Crta Utrera km 1, 41013 Sevilla, Spain
^b Departamento de Química Agrícola y Edafología, Universidad de Córdoba, Campus de Rabanales, Edificio C-3, Crta N-IV-a, km 396, 14014 Córdoba, Spain

(Received 2 April 2002; accepted 16 May 2003)

Abstract - The main objective of this work was to study the effect of foliar fertilization at different doses with a byproduct of the two-step olive oil mill process on the productivity and quality of maize crops (Zea mays, L. cv. Tundra) located in Lora del Río, near Sevilla (Andalusia, Spain). Foliar fertilizer was applied four times during the season and three different concentrations were tested. Foliar fertilization increased leaf soluble carbohydrate contents, chlorophyll A and B and carotenoids, and increased the leaf concentrations of N, K, Fe, Mn and Zn. Yield was significantly increased by 24% to 14.9 t $\cdot$ ha^-1 by the highest dosage of the byproduct, which also caused a 22% increase in kernel number and a 19% increase in grain protein content.

Résumé - Effet sur le maïs de l'application foliaire d'un sous-produit du processus d'élaboration de l'huile d'olive en deux étapes. L'objectif principal de ce travail était d'étudier l'effet de la fertilisation foliaire à doses différentes avec un sous-produit du processus d'élaboration de l'huile d'olive en deux étapes sur la production et qualité de la récolte du maïs (Zea mays, L. cv. Tundra) dans la région de Lora del Río, près de Séville (Andalousie, Espagne). L'engrais foliaire a été appliqué quatre fois pendant la saison et trois concentrations différentes ont été testées. Cet engrais a augmenté les niveaux d'hydrates de carbone, de chlorophylle A et B et de caroténoïdes et des éléments nutritifs N, K, Fe, Mn et Zn dans la feuille. Le rendement a été augmenté de 24 % et a atteint 14,9 t $\cdot$ ha^-1 avec la dose la plus élevée de sous- produit et s'est accompagné d'une augmentation de 22 % du nombre de grains et de 19 % du contenu en protéines du grain.

Key words: oil mill byproduct / olive oil / foliar fertilizer / maize

Mots clés : sous-produit d'huilerie / huile d'olive / engrais foliaire / maïs

Corresponding author: Manuel Tejada mtmoral@us.es

Communicated by Gérard Guyot (Avignon, France)

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