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Neutron Moisture Meter Calibration in Six Soils of Uzbekistan Affected by Carbonate Accumulation

^a USDA-ARS, P.O. Drawer 10, Bushland, TX 79012
^b Uzbekistan Natl. Cotton Growing Res. Inst. (UNCGRI), P.O. Box Akkavak, Kibray District, Tashkent Province 702133, Uzbekistan
^c Uzbekistan Scientific Production Centre of Agric., Usman Usupov Str. 1, Tashkent City 700000, Uzbekistan
^d Syrdarda Regional Exp. Stn., UNCGRI, P.O. Khamid Olimjon, Gulistan District, Syrdarya Province 708322, Uzbekistan
^e Fergana Regional Experiment Station, UNCGRI, Kuva Town, Fergana Province 713910, Uzbekistan
^f Kashkadarya Regional Experiment Station, UNCGRI, Kasbi District, Kashkadarya Province 731204, Uzbekistan
^g Khorezm Regional Experiment Station, UNCGRI, Urgench District, Khorezm Province 740006, Uzbekistan. The mention of trade or manufacturer names is made for information only and does not imply an endorsement, recommendation, or exclusion by USDA-ARS

View larger version (148K): [in this window] [in a new window]   FIG. 1. Map of Uzbekistan showing the locations of the six research stations where the neutron moisture meter was calibrated.

View larger version (111K): [in this window] [in a new window]   FIG. 2. (Left) A neutron moisture meter in position on a depth control stand while recording a standard count. (Right) During calibration, four volumetric soil samples were taken around each access tube at each depth. Shown are the 100-cm3 sampling cylinders.

View larger version (146K): [in this window] [in a new window]   FIG. 3. Soil profile at Syrdarya Branch Station, Uzbekistan National Cotton Growing Research Institute, showing the layer below 70-cm depth that is enriched with CaCO3 and CaSO4, which causes a difference in the neutron moisture meter calibration equations. Equations are shown in terms of volumetric water content (, m3 m–3) and count ratio (CR).

View larger version (20K): [in this window] [in a new window]   FIG. 4. Evolution of profile volumetric water content at the Syrdarya Branch Station in one treatment, showing that a water table existed at the 170-cm depth.