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How Much and When to Irrigate the Crops Using Water Content Reflectometer
Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org
Citation: Pp. 884-890 in Proceedings of the World Congress of Computers in Agriculture and Natural Resources (13-15, March 2002, Iguacu Falls, Brazil) 701P0301.(doi:10.13031/2013.8424)
Authors: M. Montiel, E. Peña, y A. Chávez
Keywords: field capacity, permanent wilting point, temporary wilting point, water content reflectometer
In the hereby work a methodology to determine the irrigation moment using water
content reflectometer (WCR) measurement equipment is applied. Initially a
traditional concepts revision on the soils humidity calculus and irrigation
programming was performed. Through the general study of soils of the II-1 Module
of the District 010 Culiacn, Sinaloa, Mxico, with its layers texture data, were
calculated by means of the proposed methodology by IMTA, adapted from Rawls
and Brakesiek, (1997), the field capacity humidity parameters (qcc) and permanent
wilting point (qpmp), as well as the humidity from which advantage can be taken
(HA). These values were plotted in SURFER ambiance as isoindexes for irrigation
programming in a graphical system in real geographical coordinates.
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The Module II-1 is integrated by 16 irrigation sections counting with an approximate
surface of 30,500 hectares and a total of 3,600 users. An analysis with foundation in
the plans elaborated to determine an equation for each one of the 16 Module II-1
irrigation sections was performed, with the purpose to serve as support to the section
head in the irrigation programming and use of the irrigation forecast system in real
time installed in the Module II-1. For the particular case of the WCR sensor use, the
existence within the humidity scale was proposed, a temporary wilting point (qpmt)
as main indicator in the determination of when and how much apply of watering to the
crop. This value was obtained for each irrigation section, through an equation that
relates the soil humidity constants. Graphs and charts summarizing the results with
success as well as a brief description thereof are presented.