Considering Salinity Effects On Crop Yields In
Hydro-economic Modelling – The Case Of A
Semi Arid River Basin In Morocco
Author(s)
C. Heidecke & A. Kuhn
Abstract
Agricultural production, especially date palm cultivation, is the major food and
income source for people in the Drâa basin in Southern Morocco. However, the
semi-arid river basin faces very low rainfalls and has suffered from a continuing
drought over the last years. River water, as the principal source for irrigation, has
been increasingly substituted by groundwater mining. This has led to an
unsustainable downing of the groundwater table, increased salinisation problems,
and has posed further constrains on the agricultural production potential. Without
targeted water resources management, water available for irrigation will soon be
depleted or too saline to be used for most crops. Consequently, farmers will not
be able to maintain their production levels, and subsequently lose an important
source of family income. The relationship between water use and agricultural
production is represented using an integrated hydro-agro-economic simulation
model with a spatial water distribution network of in- and outflows, balances and
constraints. The model results are driven by profit-maximising water use by
agricultural producers which are primarily constrained by both water availability
and quality. Crop yields are influenced by quantitative irrigation water
application deficits and by the salinity of irrigation water. Results show
considerable differences depending on whether salinity is incorporated or not.
When salinity is considered, yields tend to be much lower despite increased
irrigation water needs to enable a reduction of soil salinity through leaching.
Keywords: nonlinear programming, water allocation, water quality, salinity.
Keywords
nonlinear programming, water allocation, water quality, salinity.
Related Book
Other papers in this volume
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