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handle: 10261/79846
[ES]: Se ha determinado el equilibrio nutritivo óptimo en un campo experimental de olivar variedad «zorzaleña» cercano a Sevilla. Los datos experimentales de siete años conducen al establecimiento del siguiente equilibrio nutritivo óptimo: Equilibrio: N - 10P - K: 50 por 100, 27 por 100, 23 por 100 Equilibrio: K - Ca - Mg: 31 por 100, 58 por 100, 11 por 100 El abonado nitrogenado ejerce una gran influencia en la producción no sólo por lo que se refiere a la dosis de nitrógeno, sino a la época de empleo. Se ha demostrado la conveniencia de una aplicación temprana del abonado nitrogenado. De tres épocas diferentes ensayadas que comprenden desde la segunda quincena de febrero a la segunda quincena de abril, la primera de ellas produjo los mayores aumentos de cosecha. Se ha encontrado una estrecha correlación entre el estado de nutrición del árbol representado por las proporciones entre nutrientes y la producción. La cosecha nula o escasa corresponde siempre a árboles con evidente desequilibrio nutritivo. A este respecto parece ejercer una gran influencia. la relación Ca/K que presenta un valor elevado en todos los árboles de escasa producción.
[EN]: In an experimental field of olive trees (variety «zorzaleño») near Sevilla, the following optimum nutrient balance has been found after a seves year period: N - 10P - K equil.: 50%; 27%; 23% K - Ca - Mg equil.: 31%; 58%; 11% The yield is highly influenced by nitrogen fertilization, by both the amount of nitrogen and the time of application. An early use of nitrogen has been found advantageous. Out of the different periods of application, from February to April, the most convenient was that corresponding to the 2nd. fortnight of February. A close correlation between the nutrient condition of plants, represented by the nutrient ratio, and yields has also been found. Low or scarce production was always related to trees showing a nutrient unbalance with high Ca/K ratio. The improvement of the balance also contributes to the regularization of yield .
30 páginas, 55 figuras, 11 tablas, 18 referencias.
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