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Plant and Soil
Tripler, E., Department of Soil and Water Sciences, Faculty of Agricultural, Food and Environmental Sciences, Hebrew University of Jerusalem, P.O. Box 12, Rehovot 76100, Israel, Arava Research and Development, Arava Experimental Station, Mobile Post Eilot 88820, Israel
Ben-Gal, A., Agricultural Research Organization, Department of Environmental Physics and Irrigation, Gilat Research Center, M.P. Negev 85280, Israel
Shani, U., Department of Soil and Water Sciences, Faculty of Agricultural, Food and Environmental Sciences, Hebrew University of Jerusalem, P.O. Box 12, Rehovot 76100, Israel
Yield and transpiration of juvenile date palms (Phoenix dactylifera L., cv. Medjool) were studied under conditions of increasing salinity and boron in lysimeters. Twenty seedlings were planted and grown in 20 lysimeters and irrigated with combinations of four salinity and five B irrigation concentrations. A linear decrease was found for both yield and for transpiration in response to increased soil saturated paste salinity for the treatments having lower B concentrations (0.0278, 0.185 and 0.4625 mmol 1-1). Yield and transpiration also decreased with increased B concentration. While increases in soil saturated paste B from 0.3 to 1.5 mmol l-1 caused substantial declines in yield and transpiration, subsequent increased B to 3 mmol l-1 caused only minor reductions. Response to salinity and to excess B was witnessed from the lowest tested levels when each of the variables was isolated. Growth response to combined conditions of salinity and B behaved according to the dominant of the two stress causing factors and did not show additive effects. Dynamics of plant water uptake and tree growth observed for salinity and boron occurring independently and together were summarized by decreased water uptake but not ion accumulation for NaCl and CaCl salts and by boron that was accumulated in leaves and subsequently was associated with reduced tree size. It is suggested that while mechanisms for plant response to salinity are dominated by lowered soil water potential (osmotic stress), boron becomes toxic as it accumulates to a threshold level in plant tissue. © 2007 Springer Science+Business Media B.V.
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הספר "אוצר וולקני"
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תנאי שימוש
Consequence of salinity and excess boron on growth, evapotranspiration and ion uptake in date palm (Phoenix dactylifera L., cv. Medjool)
297
Tripler, E., Department of Soil and Water Sciences, Faculty of Agricultural, Food and Environmental Sciences, Hebrew University of Jerusalem, P.O. Box 12, Rehovot 76100, Israel, Arava Research and Development, Arava Experimental Station, Mobile Post Eilot 88820, Israel
Ben-Gal, A., Agricultural Research Organization, Department of Environmental Physics and Irrigation, Gilat Research Center, M.P. Negev 85280, Israel
Shani, U., Department of Soil and Water Sciences, Faculty of Agricultural, Food and Environmental Sciences, Hebrew University of Jerusalem, P.O. Box 12, Rehovot 76100, Israel
Consequence of salinity and excess boron on growth, evapotranspiration and ion uptake in date palm (Phoenix dactylifera L., cv. Medjool)
Yield and transpiration of juvenile date palms (Phoenix dactylifera L., cv. Medjool) were studied under conditions of increasing salinity and boron in lysimeters. Twenty seedlings were planted and grown in 20 lysimeters and irrigated with combinations of four salinity and five B irrigation concentrations. A linear decrease was found for both yield and for transpiration in response to increased soil saturated paste salinity for the treatments having lower B concentrations (0.0278, 0.185 and 0.4625 mmol 1-1). Yield and transpiration also decreased with increased B concentration. While increases in soil saturated paste B from 0.3 to 1.5 mmol l-1 caused substantial declines in yield and transpiration, subsequent increased B to 3 mmol l-1 caused only minor reductions. Response to salinity and to excess B was witnessed from the lowest tested levels when each of the variables was isolated. Growth response to combined conditions of salinity and B behaved according to the dominant of the two stress causing factors and did not show additive effects. Dynamics of plant water uptake and tree growth observed for salinity and boron occurring independently and together were summarized by decreased water uptake but not ion accumulation for NaCl and CaCl salts and by boron that was accumulated in leaves and subsequently was associated with reduced tree size. It is suggested that while mechanisms for plant response to salinity are dominated by lowered soil water potential (osmotic stress), boron becomes toxic as it accumulates to a threshold level in plant tissue. © 2007 Springer Science+Business Media B.V.
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