02455naa a2200277 a 450000100080000000500110000800800410001910000190006024501240007926000090020352016810021265000150189365000140190865000170192265000160193965300160195565300170197165300150198865300120200365300260201565300210204165300200206270000150208270000190209777300610211612786982024-05-23       1989    bl uuuu     u00u1 u    #d1 aCORREIA, M. J.  aWater and nutrient supply regimes and water relations of juvenile leaves of Eucalyptus globulus.h[electronic resource]  c1989  aPressure-volume analysis was used to study the effects of irrigation and fertilization on water relations of newly expanded juvenile leaves of Eucalyptus globulus seedlings growing at the Research Station Quinta do Furadouro, west central Portugal, approx. 10 km from the Atlantic. In May, at the beginning of the dry season, fertilization and irrigation treatments had no significant effects on the water relations parameters investigated. In Sep., at the end of the dry season, leaves from non-irrigated plants had a significantly higher apoplasmic water content and a higher dry to turgid weight ratio than leaves of similar physiological age from irrigated trees. The osmotic potential at full turgor and the water potential at the wilting point were lower in non-irrigated than in irrigated plants. Changes in osmotic potential at full turgor were negatively correlated with changes in dry to turgid weight ratio, suggesting that reductions in osmotic potential at full turgor were largely the result of decreases in cell size. Fertilization had no detectable effect on these variables or on leaf tissue bulk modulus of elasticity. Tissue elasticity was also unaffected by irrigation. Independently of water and nutrient supplies, leaf elasticity was higher and relative water content at the wilting point lower in leaves sampled in May than in leaves sampled in Sep. In non-irrigated plants, leaves sampled in Sep. had a lower tissue elasticity and a lower osmotic potential at full turgor than leaves sampled in May, indicating that leaves produced at the end of the dry season generate lower water potentials as turgor is lost than leaves expanded early in the season.  airrigation  anutrition  awater stress  aIrrigação  aBroadleaves  aFertilizacao  aFertilizer  aFoliage  aPlant water relations  aPressao osmotica  aWater relations1 aTORRES, F.1 aPEREIRA, J. S.  tTree Physiology, Victoriagv. 5, n. 4, p. 459-472, 1989.