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Carbon Dioxide Partial Pressure in Lysimeter Soils 1
Author(s) -
Robbins Charles W.
Publication year - 1986
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1986.00021962007800010031x
Subject(s) - lysimeter , agronomy , hordeum vulgare , leaching (pedology) , sorghum , soil water , irrigation , environmental science , carbon dioxide , salinity , chemistry , gypsum , poaceae , biology , soil science , ecology , paleontology , organic chemistry
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 2 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 ( 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 P CO2 values were decreased by the gypsum treatment and increased by all other treatments as compared to check. Cotton and barley had the lowest P CO2 values for the cropped treatments and Sordan had the highest (frequently above 16 kPa). The P CO2 levels were affected by applied organic matter source, crop, plant growth rate, irrigation water application and leaching.