Optimization of the irrigation time and irrigation frequency by using Hydrus-2D and a capacitance FDR sensor

Rodríguez Sinobas, Leonor and Benitez Buelga, Javier and Gil Rodríguez, María and Sánchez Calvo, Raúl and Juana Sirgado, Luis and Castañon Lion, Guillermo and Laguna Peñuelas, Francisco (2011). Optimization of the irrigation time and irrigation frequency by using Hydrus-2D and a capacitance FDR sensor. In: "8th EGU General Assembly, EGU 2011", 04/04/2011 - 08/04/2011, Viena, Austria. p. 11111.

Description

Title: Optimization of the irrigation time and irrigation frequency by using Hydrus-2D and a capacitance FDR sensor
Author/s:
  • Rodríguez Sinobas, Leonor
  • Benitez Buelga, Javier
  • Gil Rodríguez, María
  • Sánchez Calvo, Raúl
  • Juana Sirgado, Luis
  • Castañon Lion, Guillermo
  • Laguna Peñuelas, Francisco
Item Type: Presentation at Congress or Conference (Poster)
Event Title: 8th EGU General Assembly, EGU 2011
Event Dates: 04/04/2011 - 08/04/2011
Event Location: Viena, Austria
Title of Book: Geophysical Research Abstracts of 8th EGU General Assembly
Date: 2011
Volume: 13
Subjects:
Faculty: E.T.S.I. Agrónomos (UPM) [antigua denominación]
Department: Ingeniería Rural [hasta 2014]
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

The evolution of water content on a sandy soil during the sprinkler irrigation campaign, in the summer of 2010, of a field of sugar beet crop located at Valladolid (Spain) is assessed by a capacitive FDR (Frequency Domain Reflectometry) EnviroScan. This field is one of the experimental sites of the Spanish research center for the sugar beet development (AIMCRA). The objective of the work focus on monitoring the soil water content evolution of consecutive irrigations during the second two weeks of July (from the 12th to the 28th). These measurements will be used to simulate water movement by means of Hydrus-2D. The water probe logged water content readings (m3/m3) at 10, 20, 40 and 60 cm depth every 30 minutes. The probe was placed between two rows in one of the typical 12 x 15 m sprinkler irrigation framework. Furthermore, a texture analysis at the soil profile was also conducted. The irrigation frequency in this farm was set by the own personal farmer 0 s criteria that aiming to minimizing electricity pumping costs, used to irrigate at night and during the weekend i.e. longer irrigation frequency than expected. However, the high evapotranspiration rates and the weekly sugar beet water consumption—up to 50mm/week—clearly determined the need for lower this frequency. Moreover, farmer used to irrigate for six or five hours whilst results from the EnviroScan probe showed the soil profile reaching saturation point after the first three hours. It must be noted that AIMCRA provides to his members with a SMS service regarding weekly sugar beet water requirement; from the use of different meteorological stations and evapotranspiration pans, farmers have an idea of the weekly irrigation needs. Nevertheless, it is the farmer 0 s decision to decide how to irrigate. Thus, in order to minimize water stress and pumping costs, a suitable irrigation time and irrigation frequency was modeled with Hydrus-2D. Results for the period above mentioned showed values of water content ranging from 35 and 30 (m3/m3) for the first 10 and 20cm profile depth (two hours after irrigation) to the minimum 14 and 13 (m3/m3) ( two hours before irrigation). For the 40 and 60 cm profile depth, water content moves steadily across the dates: The greater the root activity the greater the water content variation. According to the results in the EnviroScan probe and the modeling in Hydrus-2D, shorter frequencies and irrigation times are suggested.

More information

Item ID: 13168
DC Identifier: http://oa.upm.es/13168/
OAI Identifier: oai:oa.upm.es:13168
Deposited by: Memoria Investigacion
Deposited on: 30 Oct 2012 11:50
Last Modified: 21 Apr 2016 12:29
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