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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License
Article
Maximizing Irrigation Water Productivity by Optimizing Leaching Fraction
Author(s)
Isam Mohammed Abdulhameed
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DOI:10.17265/2161-6256/2017.02.001
Affiliation(s)
Euphrates Higher Basin Development Center, University of Anbar, P.O. Box 55431, Baghdad, Iraq
ABSTRACT
The importance of maximizing irrigation water
productivity is increasing as the water resources still decreasing and
deteriorating due to environmental interactions. An optimal irrigation water
depth (including leaching water depth) was estimated in order to maximize water
unit volume productivity by using the optimal leaching fraction (LF), which is calculated
by the new proposed model—unit yield ratio
(UYR%) and irrigation depth ratio (IDP). A computer program was constructed to
apply this model for several crops irrigated by two water resources—river and well. The water salinity of river was 1.1 dS/m and the well salinity was 3.85 dS/m. The
results showed that there is an
optimal leaching requirement (LR) value for each crop
irrigated by any water resource. The maximum UYR% of the alfalfa irrigated by
saline well water was 58.45% with the optimal LF = 0.4, while the maximum
UYR% of the bean irrigated by river water was 78.58% with the optimal LR = 0.2. The optimal LF is saving water by increasing the
productivity of irrigation water unit volume, especially when
using saline irrigation water, for example, an increase of IDP for alfalfa by only 20%, followed by an increase of UYR% about 47.5% (from 12%
to 57%) by increasing LF from 0.1 to 0.3.
KEYWORDS
Leaching fraction, crop productivity, saline irrigation water.
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