Dinámica del carbono y nitrógeno durante la descomposición de paja de trigo de variedades tradicionales y modernas con C/N contrastados
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2018-02-21
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Jaén: Universidad de Jaén
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[ES] En esta experiencia se evaluó el efecto de restos de paja con distintos índices C/N (en dos tipos de suelo de fertilidad contrastada (uno muy fértil y otro poco fértil) en la producción de C02 y en los niveles de disponibilidad de nitrógeno. Hubo diferencias en la producción de C02 y en la disponibilidad del nitrógeno debidas a la fertilidad del suelo y a la relación C/N de los restos de paja. La mayor tasa de respiración se produce con la adición de paja con baja relación carbono/nitrógeno. También se observó y constató que había una limitación por nitrógeno en la respiración del suelo con poca fertilidad. Los niveles de nitrógeno disponible tras la adición de los restos de paja se aproximaron a cero (posible etapa de depresión del nitrógeno), pero, tras esto, aumentaron. Este efecto se ve más imponente en el caso del suelo con alta fertilidad.
[EN] In this experiment, we assessed the effects of wheat straw residues of contrasting C/N ratio added in two soils of contrasting fertility on the production of C02 and dynamics of available N. There was a significant effect of soil fertility and the C/N ratio of the wheat straw on both; production of C02 and soil N availability. The highest rate of respiration occurs with the addition of straw with a low carbon/nitrogen ratio. lt was also observed that there was a nitrogen limitation in soil respiration with low fertility. Soil N availability drop to almost zero after (likely due to a nitrogen depression stage) straw residues application. However, after this, the nitrogen availability increased. This effect was marked in the case of soil with high fertility. In short, all treatments have presented the same pattern in both soils, but with different magnitude.
[EN] In this experiment, we assessed the effects of wheat straw residues of contrasting C/N ratio added in two soils of contrasting fertility on the production of C02 and dynamics of available N. There was a significant effect of soil fertility and the C/N ratio of the wheat straw on both; production of C02 and soil N availability. The highest rate of respiration occurs with the addition of straw with a low carbon/nitrogen ratio. lt was also observed that there was a nitrogen limitation in soil respiration with low fertility. Soil N availability drop to almost zero after (likely due to a nitrogen depression stage) straw residues application. However, after this, the nitrogen availability increased. This effect was marked in the case of soil with high fertility. In short, all treatments have presented the same pattern in both soils, but with different magnitude.