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Comparison of Galvanic and Chemi-Luminescent Sensors for Detecting Soil Air Oxygen in Flood-Irrigated Pecans

Department of Plant and Environ. Sci., MSC-3Q, New Mexico State Univ., Las Cruces, NM 88003

View larger version (41K): [in this window] [in a new window]   Fig. 1. Details of the GS-type (KE50) galvanic O2 sensor and electrochemical reactions.

View larger version (30K): [in this window] [in a new window]   Fig. 2. Diagram of the FOXY O2 detection system components.

View larger version (21K): [in this window] [in a new window]   Fig. 3. Details of diffusion chambers housing the galvanic O2 sensor.

View larger version (16K): [in this window] [in a new window]   Fig. 4. Laboratory simulations of the effect of submergence and condensate formation on the performance of the KE50 galvanic sensor.

View larger version (15K): [in this window] [in a new window]   Fig. 5. Oxygen concentration measured at the private orchard with galvanic sensors (solid line) in buried chambers at 25, 50, 75, and 100 cm. The FOXY O2 sensors readings were taken from chambers located 1.4 to 2.0 m (open circle), 3.6 to 4.3 m (filled square), and 5.9 to 6 m (shaded triangle) from the nearest tree at the respective depths.

View larger version (10K): [in this window] [in a new window]   Fig. 6. Comparison of O2 concentration values measured with the FOXY system and a galvanic sensor within the same diffusion chamber.

View larger version (12K): [in this window] [in a new window]   Fig. 7. Voltage output after a normal irrigation in the private orchard: (A) rapid decline (–3.9 mV h–1) at 50-cm depth 12 h after irrigation; (B) a slow decline (–0.026 mV h–1) at 75-cm depth 144 h after irrigation.