Carbon Dioxide Partial Pressure in Lysimeter Soils

Robbins, Charles W. (1986) Carbon Dioxide Partial Pressure in Lysimeter Soils. Agronomy Journal. 78:151-158.

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Abstract

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 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.

Item Type:	Article
NWISRL Publication Number:	0565
Subjects:	Soil > Chemistry Research methodology Mass Import - autoclassified (may be erroneous)
Depositing User:	Dan Stieneke
Date Deposited:	20 Nov 2010 21:52
Last Modified:	13 Jan 2017 20:53
Item ID:	447
URI:	https://eprints.nwisrl.ars.usda.gov/id/eprint/447