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Physicochemical quality index for agricultural soils based on fuzzy logic
3rd International Conference on Biodiversity & Sustainable Energy Development
Roberto Peche, A Irizar, U Artetxe, S Fernandez, E Rodr�guez, M Soto, J M Madariaga, J M Becerril, Lur Epelde, C Garbisu, J Etxebarria and I Gorostiza
This work proposes a new index for the evaluation of the dynamic quality of agricultural soils from a physicochemical
point of view (SDQI
PHYS-CHEM
). It was designed according to a previously developed methodology based on fuzzy logic. It
allows the assessment of the physicochemical changes induced in the soil by its use and/or management as well as by pollution.
The information required to design the SDQI
PHYS-CHEM
was obtained from a panel of experts in the different aspects related
to the quality under assessment and their ecological implications. An environmentalist board coordinated the panel and the
acquisition, management and treatment of the information during each stage of the procedure. Conventional convergence
methods were used to achieve a joint opinion at every stage, which rigorously integrates and represent the contributions of
the panelists. First, according to the methodology, the set of physical and chemical properties or attributes (a
i
) included in the
index was set. Then, conventional indicators (I
i
) were selected to quantify each ai and the range of values [min I
i
, max I
i
] of each
Ii was established. Subsequently, the fuzzy sets B
i
were defined for each property a
i
, which describe in fuzzy terms the beneficial
contribution of ai to the SDQI
PHYS-CHEM
. Next, the relative importance of the properties was estimated. For this, a normalized
priority vector W? = {w?
1
,..., w?
i
, ..., w?
n
} was determined, so that each component w?
i
represents the relative significance of
attribute a
i
in the SDQI
PHYS-CHEM
- represented as a fraction of unity. Finally, a set of fuzzy rules was defined in order to describe
the knowledge base of the SDQI
PHYS-CHEM
. Each rule gives the relation between a set of fuzzy values of the properties a
i
- one
value for each variable - and the value of the SQI
BIO
corresponding to that physicochemical status of the soil. This index was
validated in some agricultural parcels previously defined by the panel as being of low, medium and high physicochemical
quality. The value of the SDQI
PHYS-CHEM
ranges from 0 to 1, the quality being higher the closer the value of the index is to 1.
Biography
Roberto Peche, Doctor of Chemistry is a Senior Lecturer at the Department of Environmental and Chemical Engineering of the University of the Basque Country
(Spain). He lectures in the Industrial Chemical Engineering Degree Program. His main research experience is related to environmental technologies and the
treatment of environmental information by fuzzy logic. He has participated in diverse research projects and has published a number of full papers in prestigious
international scientific magazines.
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