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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

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Received: 8 November 2013 / Revised: 16 December 2013 / Accepted: 18 December 2013 / Published: 23 December 2013
(This article belongs to the Section Physical Sensors)
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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 which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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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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