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Sensors 2014, 14(1), 212-228; doi:10.3390/s140100212
Article

Set Up of an Automatic Water Quality Sampling System in Irrigation Agriculture

1,* , 1
,
1,†
,
1
,
2
 and
1
1 Institute for Landscape Ecology and Resources Management, Research Centre for BioSystems, Land Use and Nutrition (IFZ), University Giessen, Heinrich-Buff-Ring 26, Giessen 35392, Germany 2 International Rice Research Institute, Los Baños 4030, Philippines Present address: Thünen Institute of Climate-Smart Agriculture, Bundesallee 50, Braunschweig 38116, Germany
* Author to whom correspondence should be addressed.
Received: 8 November 2013 / Revised: 16 December 2013 / Accepted: 18 December 2013 / Published: 23 December 2013
(This article belongs to the Section Sensor Networks)
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Abstract

We have developed a high-resolution automatic sampling system for continuous in situ measurements of stable water isotopic composition and nitrogen solutes along with hydrological information. The system facilitates concurrent monitoring of a large number of water and nutrient fluxes (ground, surface, irrigation and rain water) in irrigated agriculture. For this purpose we couple an automatic sampling system with a Wavelength-Scanned Cavity Ring Down Spectrometry System (WS-CRDS) for stable water isotope analysis (δ2H and δ18O), a reagentless hyperspectral UV photometer (ProPS) for monitoring nitrate content and various water level sensors for hydrometric information. The automatic sampling system consists of different sampling stations equipped with pumps, a switch cabinet for valve and pump control and a computer operating the system. The complete system is operated via internet-based control software, allowing supervision from nearly anywhere. The system is currently set up at the International Rice Research Institute (Los Baños, The Philippines) in a diversified rice growing system to continuously monitor water and nutrient fluxes. Here we present the system’s technical set-up and provide initial proof-of-concept with results for the isotopic composition of different water sources and nitrate values from the 2012 dry season.
Keywords: automatic water quality sampling system; rice paddy; nitrate; stable water isotopes automatic water quality sampling system; rice paddy; nitrate; stable water isotopes
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Heinz, E.; Kraft, P.; Buchen, C.; Frede, H.-G.; Aquino, E.; Breuer, L. Set Up of an Automatic Water Quality Sampling System in Irrigation Agriculture. Sensors 2014, 14, 212-228.

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