Evaluation Of BMPs Scenarios For Minimizing Phosphorus And Sediments Transport In Sprinkler Irrigation System
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Date
2012
Authors
Skhiri, AhmedDechmi, Farida
Journal Title
Journal ISSN
Volume Title
Publisher
ASABE
Typology
Proceedings Paper , conferenceObjectArticle
Abstract
Simulation models are useful tools to quantify the effects of best management practices
(BMPs). After SWAT (Soil and Water Assessment Tool) adaptation and calibration for intensive
irrigated watershed, it has been used to evaluate the impact of several (BMPs) on water yield
(WYLD), total suspended sediment (TSS), organic P (ORG_P), soluble P (SOL_P), and total P (TP)
at the outlet of the Del Reguero stream watershed (Spain). Economic impacts of the BMPs on crop
gross margin were also evaluated. In total, 6 individual scenarios and 14 combinations of various
management practices including tillage (conservation and no-tillage), fertilizer (incorporated,
recommended, and zero), and irrigation (adjusted to crop needs) were been tested. Results indicate
that the best individuals BMPs (adjusted irrigation water use BMP) reduced WYLD to 31.4%, TSS
loads 33.5%, and TP loads to 12.8%, in comparison of the initial conditions. When individual BMPs
were combined, the percentage reductions of losses were increased. The BMPs combination
between optimum irrigation application, conservation tillage and reduced P fertilizer dose was the
best analysed one with a TP loads reduction about 22.6%. For corn and alfalfa, the best BMP
scenario was the combination between conservation tillage and reduced P fertilizer dose, reaching
an increase of gross margin by 309 € ha-1and 188 € ha-1, respectively. While for sunflower and
barley, the best scenario was the combination between irrigation adjustment, conservation tillage and
reduced P fertilizer dose. The increase of gross margin under this BMP was about 171 € ha-1and 307
€ ha-1, respectively.
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Bibliographic citation
CD-Rom Proceedings, May 27-June 1, 2012, Bari, Italy: Bari, Italia, 27 mayo - 1 junio 2012
AGROVOC subjects
Riego por aspersiónCalidad del agua
Fósforo
Modelos de simulación