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handle: 10261/60751
[ES] Son estudiadas las variaciones en la acumulación de materia seca, así como las del contenido en humedad, altura de plantas y longitud de hojas en dos híbridos de maíz creciendo en las condiciones ambientales de las Rías Bajas de Galicia, en suelo de buen nivel de fertilidad. La periodicidad de la recogida de muestras fue semanal los tres primeros meses y después quincenal. Los resultados obtenidos muestran que pese a las diferencias entre los ciclos vegetativos de ambos maíces y entre sus potenciales de productividad, la evolución de las variables con el tiempo son bastante similares. En relación a la síntesis de materia seca las curvas de acumulación en función del tiempo son sigmoideas, pero durante la época de mayor formación el aumento es lineal, con producciones día/planta de 5,2 ± 0,8 g. y 7,6 ± 0,7 g. de materia seca ( rA = 0,991; rB= 0,997). La razón entre la materia seca contenida en el grano y la del resto de la planta es, para ambos híbridos, de 0.63 en la última recogida, exponente asimismo de cierta similitud en la distribución de aquella entres sus componentes. Los maíces pierden agua en forma paulatina, pero no lineal, desde la nascencia a la maduración. Hay, asimismo, descenso de la humedad al ascender en la planta, conteniendo el tallo, a la misma altura, más agua que las hojas. Los híbridos utilizados mantienen alta humedad en la época de maduración.
[EN] This paper studies the variation in dry matter accumulation, moisture content, plant height , and leaves length in maize. Two hybrids were grown at one location in the Rias Bajas (Galicia) environment on a high fertility soil. Samples were taken every week during the first three months and every other week afterwards. The evolution along time of the four variables was similar for both hybrids although they differ in growing season and yield potential. Dry matter accumulation curves along time were of sygmoid type. However, dry matter accumulation along time was linear during the phase of maximum increase rate with mean dry matter productions per day and plant of 5.2 ± 0.8 g and 7.6 ± 0.7 g for each hybrid respectively (rA=0.991; rB=0.997). The ratio "kernel dry matter/rest-of-the-plant dry matter" was 0.63 for both hybrids in the last sampling. Thus dry matter distribution seemed to be unaffected by the genetic background of the experimental material. Both hybrids lost water gradually, although not linearly, from emergence to maturity. Moisture content was lower in the upper parts of the plants, and it was higher in the stalks than in the adjacent leaves. The hybrids used in this study were of a type that maintains a high moisture percentage in the stalks at maturity.
Peer reviewed
Zea mays L., Dry matter, Materia seca, Galicia
Zea mays L., Dry matter, Materia seca, Galicia
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