Call For Paper Volume:4 Issue:10 Oct'2017 |

Root zone salinity modeling within Kalaat El Andalous irrigated district (Tunisia) using SaltMod model

Publication Date : 30/11/2015



Author(s) :

Ahmed SAIDI , Moncef Hammami , Hedi Daghari , Hedi Ben Ali , Amor Boughdiri .


Volume/Issue :
Volume 2
,
Issue 11
(11 - 2015)



Abstract :

SaltMod simulations indicate a slight change of root zone salinity remaining between 3 and 6 dS/m and do not causes risks to forage and cereal crops. However, such salinity is causing a yield decrease of 10 to 20% for tomato crop. During the next 10 years, groundwater water table depth will range between 1.33 and 1.76 m. and remains lower than that of the root zone (0.6 m). Therefore, groundwater table will not pose problems as long as we keep the same management conditions during this period. Moreover, the simulation of drainage system depth variation impacts on root zone salinity indicates that a decrease of drainage lines depth does not affect root zone salinity which remains constant (4.94 dS/m and 3.68 dS/m respectively during the first season and the second season). Regarding groundwater table depth, it is noted that there is a variation for each drainage lines depth variation and groundwater level is ranging from 1.26 to 0.26 m and 1.76 to 0.76 m during the first season and the second season respectively. Thus, optimum drainage lines depth corresponds to that for which salinity and groundwater level have acceptable values not threatening crops and generating minimum drainage flow. Referring to model simulations, we notice that the most appropriate drainage lines depths under these management conditions range between 1.4 and 1.8 m. Therefore, drainage lines depth can be reduced to 1.6 m without any damage of crops and yields. Simulations have also showed that root zone salinity has a tendency to increase due to an increase of irrigation water salinity and irrigation water volume on one hand and to a decrease of rainfall amount on the other hand. Moreover, it has been found that root zone salinity showed a tendency to decrease due to a decrease of irrigation water volume, a decrease of irrigation water salinity and an increasing amount of rain. 


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Root zone salinity modeling within Kalaat El Andalous irrigated district (Tunisia) using SaltMod model

November 24, 2015