Seasonal changes of mineral nutrients in olive leaves during the alternate-bearing cycle

Fernández-Escobar, R.; Moreno, Roberto; Garcı́a-Creus, M.

doi:10.1016/s0304-4238(99)00045-x

Cited by 149 publications

(91 citation statements)

References 14 publications

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“…All percentage values were transformed using the arcsin of the square root before analysis. (Fernández-Escobar et al, 1999). No differences at all were observed between treatments in NoHay, a fertile orchard that showed the highest leaf N concentrations during the period of study.…”

Section: Methodsmentioning

confidence: 79%

“…The first treatment consisted of olive fertilization based on foliar diagnosis. A nutrient was supplied only if the annual analysis indicates that leaf nutrient concentration was below the sufficiency level according to the reference values (Fernández-Escobar et al, 1999). Nitrogen fertilization consisted of soil application of urea in April at a rate of 1 kg tree -1 , foliar sprays of 3% KNO 3 in April, May, and September, and a foliar spray of 2.5% of urea in September.…”

Section: Methodsmentioning

confidence: 99%

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Foliar diagnosis as a guide to olive fertilization

Fernández-Escobar¹,

Parra²,

Navarro³

et al. 2009

Span. j. agric. res.

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A long term experiment was established in olive orchards of Andalusia, southern Spain, to compare the fertilization practice based on foliar diagnosis versus the current fertilization practice in the area. Only nutrients whose concentration in leaves taken in July were below the critical levels were applied in the former treatment, whereas in the latter 500 kg ha -1 of a 15-15-15 complex fertilizer, and three foliar sprays of micronutrients and aminoacids were applied annually. Four olive orchards were selected. One orchard has a small effective depth (33 cm) limited by a petrocalcic horizon. The second has an effective soil depth of 60 cm, and is representative of broad level uplands on hard calcareous rocks. The third orchard has a deep soil (~90 cm), typical of rolling areas with soft marls; and the fourth is a soil whose effective depth is also large (~90 cm), representative of flat areas on soft clayey sediments, partially decalcified. One homogeneous zone of 2-ha was split into two plots within each orchard, and the treatments were randomly assigned to each plot. After five years, no significant differences were found in yield, fruit weight, oil content or vegetative growth, but polyphenols in the oil decreased in trees subjected to the traditional fertilization. Fertilization cost increased in more than 10 times in the traditional fertilization plots. Results indicate that the current fertilization practice apply more nutrients that needed for a good crop, negatively affect olive oil quality, and increase cost compared with foliar diagnosis.Additional key words: leaf-nutrient analysis; Olea europaea; rational fertilization practices. Resumen El diagnóstico foliar como guía de fertilización del olivarSe estableció un experimento a largo plazo en olivares andaluces, con el objetivo de comparar la fertilización basada en el diagnóstico foliar frente a la convencional en la zona. En el primer caso, sólo se aplicaron los nutrientes que presentaban un nivel en hoja por debajo del nivel crítico, mientras que en el segundo caso se aportó anualmente 500 kg ha -1 de 15-15-15 y tres aplicaciones foliares de micronutrientes y aminoácidos. Se eligieron cuatro olivares para el estudio. El primero presentaba una profundidad efectiva de 33 cm limitada por un horizonte petrocálcico; el segundo una profundidad de 60 cm, limitado por una roca dura; el tercero, de mayor profundidad (90 cm) y perfil uniforme y calcáreo; y el cuarto, de 90 cm de profundidad, parcialmente descarbonatado. En cada uno se seleccionó una parcela de 2 ha, que se dividió en dos para asignar, al azar, los tratamientos. Después de cinco años no se encontraron diferencias significativas en producción, en tamaño del fruto, en contenido graso ni en crecimiento vegetativo, pero disminuyeron los polifenoles en el aceite en la parcela fertilizada de acuerdo con los criterios de la zona. Por otra parte, los costes aumentaron en más de 10 veces en estas parcelas. Los resultados indican que la práctica convencional de fertilización aumenta la aplicación...

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Section: Methodsmentioning

confidence: 79%

Section: Methodsmentioning

confidence: 99%

Foliar diagnosis as a guide to olive fertilization

Fernández-Escobar¹,

Parra²,

Navarro³

et al. 2009

Span. j. agric. res.

Self Cite

View full text Add to dashboard Cite

show abstract

“…A tabela 3 apresenta as concentrações de minerais determinadas nas folhas de oliveira. Pode-se perceber, de maneira geral, que os minerais presentes em maior concentração foram Al, Ca, Fe, K, Mg, P e S. FERNÁNDEZ-ESCOBAR et al(1999) …”

Section: Resultsunclassified

Composição química de folhas de oliveira (Olea europaea L.) da região de Caçapava do Sul, RS

et al. 2014

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“…K accumulation during warmer seasons has been reported in diverse species (Yuehua von fi rcks et al , Ramirez et al 2006. Ca has been reported to accumulate in winter in diverse species like olives and rhododendron (Fernandez-escobar et al 1999, Gary et al 2006. Na accumulation in monsoon is surprising.…”

Section: Resultsmentioning

confidence: 99%

Nutrient composition of cultivated stevia leaves and the influence of polyphenols and plant pigments on sensory and antioxidant properties of leaf extracts

et al. 2010

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Stevia rebaudiana is an introduced crop in India. The leaf and its extract although sweet have a bitter after taste that precludes commercial acceptability. The composition of the leaf refl ected a high nutritive value and polyphenol concentration averaging 4.15% by weight of dried leaf. Variably processed extracts enriched with polyphenols, pigments and a mixture of both were evaluated for sensory attributes by a semi trained panel when added to cofee and lime juice. Presence of polyphenols infl uenced the acceptability of the sweeteners marginally, while chlorophyll was found unacceptable in any of the extracts. The antioxidant activity of the extracts was synergistic when it was mixed with coffee and lime juice. Complete purifi cation of stevia leaf extracts to obtain pure glycosides is not necessary for it to become a commercially acceptable sweetener.

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Seasonal changes of mineral nutrients in olive leaves during the alternate-bearing cycle

Cited by 149 publications

References 14 publications

Foliar diagnosis as a guide to olive fertilization

Foliar diagnosis as a guide to olive fertilization

Composição química de folhas de oliveira (Olea europaea L.) da região de Caçapava do Sul, RS

Nutrient composition of cultivated stevia leaves and the influence of polyphenols and plant pigments on sensory and antioxidant properties of leaf extracts

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