The effect of salinity on corn yield using the CERES-maize model |
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Authors: | José Beltrão Jiftah Ben Asher |
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Institution: | (1) Unidade de Ciê e Tecnologias Agrárias, Universidade do Algarve, Campus de Gambelas, 8000 Faro, Portugal;(2) Blaustein Institute for Desert Research, Ben Gurion University of the Negev, Sede Boker Campus, 84993, Israel |
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Abstract: | In most cases, when calculating soil water availability, only thewater content is considered. The effect of salinity on the wiltingpoint is neglected. The objective of this work is to use asimulation model (CERES-maize) in order to predict cornyields as a function of water salinity under severalenvironmental, agrotechnical, and plant characteristics. A modelis presented in which the wilting point is a function of the soilsalt content. At high salinity, the water content at wilting pointis higher than at low salinity, resulting in an insufficient amountof available water and, therefore, a reduced yield. The modelwas used to simulate several theoretical and experimentalsituations for forage corn and grain corn. Simulation resultsshowed that nitrogen fertilization increases the salinity thresholdvalue and the yield sensitivity (rate of yield reduction per unitof salinity). The also showed that forage corn is more sensitiveto salinity than grain corn. If the soil is not leached, a heaviersoil texture has a higher salinity threshold value. On the otherhand, if the soil is leached, the soil texture has no influence onthe salinity threshold value and the yield is less sensitive tosalinity in sandy soils. The determination coefficient (r2= 0.75) indicated that the results of the simulations were in goodagreement with the field data. |
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Keywords: | corn yield modelling salinity simulation soil water availability wilting point |
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