Impact of harvest residues,fertilisers and N-fixing plants on growth and nutritional status of young <Emphasis Type="Italic">Eucalyptus globulus</Emphasis> plantations,under Mediterranean conditions |
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| Authors: | A C Madeira M Madeira A Fabião P Marques M Carneiro |
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| Institution: | 1.Instituto Superior de Agronomia, Universidade Técnica de Lisboa,Lisboa,Portugal |
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| Abstract: | Growth and nutritional status of young plants of Eucalyptus were assessed in a field trial, under different scenarios of harvest residue management and nutrient availability. Treatments
were as follows: incorporation of harvest residues into the soil by harrowing (I); I with N fertiliser application (IF); I
with leguminous, Lupinus luteus L., seeding (IL); removal of harvest residues (R); R with N fertiliser application (RF); R with leguminous seeding (RL);
distribution of harvest residues on the soil surface (S); S with N fertiliser application (SF). Treatments were replicated
four times in four blocks with a fully randomised design. Tree growth (height and diameter at breast height) was measured
and understory biomass destructively recorded. Tree nutritional status was assessed by foliar analysis (N, Ca, Mg, P, K and
leaf area). Significant differences in growth between I, R and S treatments were only detected at early stage. Intercropping
with Lupinus decreased tree growth during the early phase, but after 5 years growth was similar to that measured in the I and R treatments.
Application of fertiliser enhanced tree growth especially when harvest residues were retained on the soil surface. Combining
incorporation of harvest residues with fertiliser application (IF) was the best option to increase tree growth, which was
significantly greater than in the R and S. Initially, leaf N was positively affected by the leguminous (RL and IL), but, after
the first fertiliser application (1 year after planting), greater N was observed in the IF, RF and SF, the difference decreasing
gradually over the following years. |
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