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Set up of an automatic water quality sampling system in irrigation agriculture

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10.3390_s140100212.pdf (355.1Kb)
Date
2014
Author
Heinz, Emanuel
Kraft, Philipp
Buchen, Caroline
Frede, Hans-Georg
Aquino, Eugenio
Breuer, Lutz
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http://dx.doi.org/10.22029/jlupub-8476
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 (delta2H and delta18O), 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.

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https://doi.org/10.3390/s140100212
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