NWISRL PublicationsCarbon Dioxide Partial Pressure in Lysimeter SoilsCharles W.RobbinsauthorThe carbonate chemistry portion of mechanistic salinity models is generally the weak link in describing salt reactions in soils. This is primarily due to a lack of available soil atmosphere CO2 data. Carbon dioxide concentrations were measured at 0.25, 0.50, and 0.75 m depths in 0.30 m diam lysimeters containing 1.0 m of sodic soil. Four non-cropped treatments included a check, gypsum, fresh manure, and chopped alfalfa irrigated weekly with 70 mm (5.0 l) of tap water (EC-0.7 and SAR= 1.7). Six cropped treatments included barley (Hordeum vulgare), alfalfa (Medicago sativa L.), Sordan (Sordan is a trade name for a sorghum (Sorghum bicolor), sudangrass (Sorghum sudanese hybrid], Sordan + leaching, cotton (Gossypium hirsutum L), and tall wheatgrass (Agropyron elongatum). The cropped lysimeters were irrigated at 1.25 times the consumptive use since the previous irrigation (0.20 leaching fraction). Soil PCO2 values were decreased by the gypsum treatment and increased by all other treatments as compared to check. Cotton and barley had the lowest PCO2 values for the cropped treatments and Sordan had the highest (frequently above 16 kPa). The PCO2 levels were affected by applied organic matter source, crop, plant growth rate, irrigation water application and leaching.ChemistryResearch methodologyMass Import - autoclassified (may be erroneous)1986Article

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