Resumo

LUPI, Ana María; PATHAUER, Pablo Santiago; NETTO, Victoria  e  CAPPA, Eduardo Pablo. Evaluación del crecimiento y estado nutricional de híbridos interespecíficos de Eucalyptus sometidos a estrés por anegamiento y salinidad. Cienc. suelo [online]. 2017, vol.35, n.1, pp.57-68. ISSN 1850-2067.

An experiment was conducted under controlled conditions during 90 days to study the fortnightly response of two Eucalyptus hybrids (Eucalyptus grandis x Eucalyptus camaldulensis and Eucalyptus grandis x Eucalyptus tereticornis), subject to the effect of 3 water levels A: 1) normal watering; 2) cycles of 30 days of waterlogging followed by 15 days of normal irrigation; and 3) water table. At the same time, A2 and A3 treatments were combined with salinity levels (EC): <4 (control), 6 and 12 dS m^-1. Biweekly total plant height and neck diameter were measured and mortality was recorded. After 90 days, leaf, branch and stem dry matter was determined along with foliar macronutrient concentration and soil fertility characterization in the pots. Plant growth and biomass significantly decreased with increasing salinity associated to flooding and high salty water table. Na foliar concentration increased whereas K decreased in treatments with moderate to high salinity. The effect on growth and biomass was less adverse when the solution was not saline. Saline solution added to the soil displaced exchangeable bases (Ca + Mg) and increased Na and PSI, but soil EC did not exceed 4 dS m^-1. The hybrid E. grandis x E. camaldulensis showed higher growth, foliar concentration and biomass compared with E. grandis x E. tereticornis. This lower tolerance was also evidenced by earlier mortality.

Palavras-chave : Multiple stress; Salt tolerance; Waterlogging. Eucalyptus; Controlled conditions.

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