Application Of The SWAP Model For Sustainable
Agriculture In An Arid Region
Author(s)
B. Mostafazadeh-Fard, H. Mansouri, S. F. Mousavi & M. Feizi
Abstract
Iran is located in an arid and semi-arid region of the world with average annual
precipitation of about 250 mm. Due to lack of suitable water resources, many
farmers are using saline river or groundwater for irrigation which causes gradual
accumulation of salts in the soil. Salinity of soil and water resources is one of the
major environmental factors limiting the productivity of agricultural lands and
reduces land area under cultivation. For sustainable agricultural productions,
appropriate irrigation management practices should be applied if the saline
irrigation water is to be used for irrigation. The SWAP (soil-water-atmosphere-
plant) model is a physical-based model that can be used to simulate crop yield
and soil salinity, among others. To collect field data to apply to this model as
input and calibrate it, a field experiment planted with wheat was conducted on a
silty clay loam soil, in the central part of Iran (the Rudasht region near Isfahan
with an annual average precipitation of about 80 mm), with three irrigation water
salinity levels of 2, 8 and 12 dS/m with/without leaching levels of 4, 19 and 32
percent with two different irrigation water managements, using factorial design
with four replications. The results showed that the model is applicable in this
arid region and has low sensitivity to input data of root distribution depth and
irrigation water salinity and medium sensitivity to climate data, soil surface layer
hydraulic characteristics, leaf area index and amount of irrigation. The model
simulated wheat yield and the calibration coefficients were obtained. The results
showed that the model could be used as an effective tool for sustainable
agricultural production.
Keywords: SWAP model, wheat, yield, Iran.
Keywords
SWAP model, wheat, yield, Iran.
Related Book
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