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Methodology to assess the maximum irrigation rates at regional scale using geostatistics and GIS

AuthorsPaz Bécares, José Miguel de; Albert, C.; Visconti Reluy, Fernando ; Jiménez, G.; Ingelmo Sánchez, Florencio ; Molina, M. J. ; Sánchez, J.
Irrigation rate
Soil water holding capacity
Precision irrigation
Issue DateJul-2012
PublisherInternational Commission of Agricultural and Biosystems Engineering
CitationConference of Agricultural Engineering (2012)
AbstractSoil water holding capacity is an important parameter for irrigation scheduling and water balance modelling in fields. In the framework of precision irrigation the knowledge of the spatial distribution of this parameter is useful to advice the maximum irrigation rate specifically for each field in an irrigation district, region, etc. The soil water holding capacity (SWHC) can be assessed as the soil water content between the field capacity (FC) and the permanent wilting point (PWP). In this work, we present a methodology to assess the spatial distribution of the maximum irrigation rate depending on the soil water holding capacity. This methodology combines geostatistic techniques with geographical information system-GIS tool. A pilot zone of 12 400 ha located in the Palancia river lowland (between Valencia and Castellón province, Spain) in which the main irrigated crops are citrus (53.8 %), and vegetables (13.3 %), was selected to develop this methodology. For spatial modelling of SWHC, experimental semivariograms were assessed for the FC and PWP at three soil depth intervals (0-10, 10-30, 30-60 cm). Spherical models fitted well to the experimental semivariograms, with a very high spatial dependency index (ID = 0.05-0.41) which support reliable predictions on basis the fitted models. The cokriging spatial interpolation method, considering the percentage of sand as secondary variable, was the best option to minimize the root mean square error in the cross-validation test.
DescriptionPonencia presentada en la Conference of Agricultural Engineering celebrada en Valencia del 8 añ 12 de julio de 2012
Appears in Collections:(CIDE) Comunicaciones congresos
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