ABSTRACT
The effects of the water and nutrients deficits were about the growth, nutrients accumulate and the assimilate partition, in five eucalyptus species (Eucalyptus pellita F. Muell; E. camaldulensis Dehn, E. citriodora Hook, E. cloeziana F. Muell and E. urophylla St. Blake), cultivated in glasshouse grown were characterized. Plants with 155 days of age, grown in tubes of PVC, with moisture of soil near field capacity, and two level of phosphorus in the soil (30 and 300 mg/l), were submitted to the water deficit by 65 days. Afterwards, the plants were shared, weighted and put in forced ventilation until constant weight. Chemical analyses of nitrogen, phosphorus, potassium, calcium and magnesium in the different organs of the plant were corried out. The results demonstrated the occurrence of significant differences among species, phosphorus doses and water deficit with relationship to the assimilate distribution and accumulation of nutrients in the different organs of the plant. Under water deficit and smaller phosphorus level E. camaldulensis showed larger increase in the relationship root / aerial part and smaller reduction in the production of total dry matter. E. cloeziana presented the largest reduction in the production of dry matter. All the growth parameters decreased with the water and nutricional deficit. The assimilate partition and the concentration of nutrients showed that the influence of the conditions of the environment in the allocation of assimilated and of the content of nutrients depends on the species in consideration and that, apparenthy, E. cloeziana and E. camaldulensis were, respectively, the species less and more adapted to the drought.
Key words:
Leaf area; Eucalyptus pellita; E. camaldulensis; E. citriodora; E. cloeziana; E. urophylla.