Information requirements and data sources for automated irrigation control in tree crops

J. Casadesús

Information requirements and data sources for automated irrigation control in tree crops

in Precision agriculture '09

Autor:in:

J. Casadesús

J. Casadesús IRTA, Institut de Recerca i Tecnologia Agroalimentàries, Avgda. Alcalde Rovira Roure, 191, 25198 Lleida, Spain; Jaume.Casadesus@irta.cat

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Art:: Kapitel

Seiten:: 809–816

DOI:: https://doi.org/10.1163/9789086866649_097

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Abstract

The overall requirements of information for drip-irrigation control in tree crops are analyzed here using an abstraction for a generic controller that tries to summarize most of the reported approaches in irrigation control. Despite the diversity of control strategies and sources of data that can be used to support them, some general patterns can be recognized. This analysis highlights three key pieces of information that are essential for most irrigation control applications. First, an estimation of the water needs imposed by the environmental conditions. Basically, this means an estimate of the reference crop evapotranspiration (ETo), which can either be calculated from a set of local meteorological sensors, or estimated from a simplified subset of these sensors, or queried to an external meteorological network. Second, an indication of vegetation size or its coupling to the environment. This can be either based on crop coefficients (Kc) published by irrigation support organizations, or estimated from ground cover measurements or derived from data obtained from external sources like vegetation maps or remote sensing images. And third, an indication of the crop water state, which must be based on sensor measurements within the irrigated system. A variety of approaches exist for assessing the crop water state, including different soil probes as well as the use of plant water-stress indices derived from different types of plant probes. Hence, all these pieces of information can be supported by multiple sources of data, whose feasibility will vary from case to case. Then, irrigation control applications should not predetermine how those pieces of information will be obtained but should facilitate the adaptation of the control strategies to the particular context of each scenario. The identification of a general pattern for irrigation control that can be implemented in a variety of ways provides a sound base and at the same time allows a great flexibility to adapt to particular conditions.

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Precision agriculture '09

ISBN:: 9789086866649

Verleger:: Wageningen Academic

Print-Publikationsdatum:: 01 Jan 2009

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- Biowissenschaften
  - Allgemein
  - Landwirtschaft und Umwelt

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Information requirements and data sources for automated irrigation control in tree crops

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Precision agriculture '09

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