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
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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.
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(1):212-228.
Heinz, Emanuel; Kraft, Philipp; Buchen, Caroline; Frede, Hans-Georg; Aquino, Eugenio; Breuer, Lutz. 2014. "Set Up of an Automatic Water Quality Sampling System in Irrigation Agriculture." Sensors 14, no. 1: 212-228.