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Carbon Dioxide Partial Pressure in Lysimeter Soils
- Robbins, Charles W.
- Agronomy journal 1986 v.78 no.1 pp. 151-158
- field crops, soil air, carbon dioxide, soil pH, saline soils, irrigated soils
- The 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 CO 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 1) of tap water (EC=0.7 and SAR=1.7). Six cropped treatments included barley (), alfalfa (L.), Sordan [Sordan is a trade name for a sorghum (), sudangrass (hybrid], Sordan + leaching, cotton (L.), and tall wheatgrass (). The cropped lysimeters were irrigated at 1.25 times the consumptive use since the previous irrigation (0.20 leaching fraction). Soil P values were decreased by the gypsum treatment and increased by all other treatments as compared to check. Cotton and barley had the lowest P values for the cropped treatments and Sordan had the highest (frequently above 16 kPa). The P levels were affected by applied organic matter source, crop, plant growth rate, irrigation water application and leaching.