GROWTH OF <i>Tectona grandis</i> SEEDLINGS IRRIGATED WITH SALINE WATER

Abstract

The objective of the present study was to evaluate the effect of the irrigation water salinity on the initial growth of Tectona grandis plants. The work was carried out in a greenhouse with 100% solar radiation interception at Goiás State University, Ipameri Campus, Brazil. The Tectona grandis seeds were sown in eight-liter pots containing a mixture of soil, sand and manure at ratio 3:1:0.5, respectively. At 100 days after germination, the plants were irrigated daily with water of different electrical conductivity (0, 2, 4, 6, and 8 dS m -1 ) for 30 days and then subjected to analysis Tectona grandis to stay alive and reduced water loss by transpiration through efficient stomatal control. Tectona grandis plants in the early stages of development are highly sensitive to salinity stress, significantly slowing down vegetative growth.

Eucalyptus urocam plant tolerance to salinity in response to silicon-based fertilization

“…The lower electrical conductivity limited CO2 inflow, photosynthesis and biomass accumulation. Stomata control by tree plants to minimize water loss underwater shortage or salinity has been reported by several authors (Duarte, Rocha, De Lima, Matos & Rodrigues, 2016;Freitas et al, 2017;Matos et al, 2016) The low Si percentage in the leaves and roots of Eucalyptus urocam plants was indicative that this species does not accumulate this nutrient, but it was possible to verify that the accumulation in roots and leaves was much bigger in plants irrigated with non-saline water. The lower percentage of sodium in the leaves and roots may be related to the beneficial effects of Si (Table 2).…”