Productivity,nutrient immobilization and soil chemical properties in anEucalyptus globulus plantation under different irrigation and fertilization regimes |
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| Authors: | M Madeira J S Pereira |
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| Institution: | 1. Instituto Superior de Agronomia, 1399, Lisboa Codex, Portugal
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| Abstract: | To evaluate the influence of irrigation and fertilization on the productivity ofE. globulus a field experiment was started in 1986 in Central Portugal. The nutrients accumulated in the biomass and their allocation
to the various biomass components as well as the changes in soil chemical characteristics were also followed. Irrigation and
fertilization resulted in a significant increase of biomass production during the first 2 yr. A similar trend occurred with
the net primary production and leaf Litterfall. The differences between treatments in the amounts of accumulated nutrients
in the aboveground biomass were similar to those of biomass accumulation. However, there was a small but consistent effect
related to the average concentration of nutrients in the plant tissues. This effect occurred essentially in the leaves and
branches. The concentration of N and P in the leaf Litterfall was higher in the fertilized treatments than in the others.
Fertilization alone induced a slight increase in the soil pH values, C content, exchangeable Ca and available P levels. Such
increase was more pronounced in the fertilized with dripping irrigation treatment. This was due to the accumulation of nutrients
in the wetted soil volume. |
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