Concentration of soil CO2 as an indicator of the decalcification rate after liming treatment

Abstract

This paper presents the results of investigation of decalcification of acid sandy and loamy sand soils by infiltration waters, and potential Ca-leaching after liming treatment. For this purpose, monthly measurements were made of the concentration of CO2 in the soil air, dissolved inorganic carbon in the soil waters, and their ionic composition. The determined dissolved inorganic carbon ranged from 5.9 to 10.6 mg dm−3 and from 9.9 to 16.5 mg dm−3 for the sandy and loamy sand soil, respectively. The Ca concentration in soil waters was determined as 5.9-12.4 mg dm−3 in sandy soil and 14.2-19.8 mg dm−3 in soil loamy sand. The calculated rate of decalcification amounted to 23.0 kg ha−1 year−1 in soil sandy and 19.4 kg ha−1 year−1 in loamy sand soil. The potential Ca-leaching is predicted as 124 kg ha−1 year−1 for S and 87 kg ha−1 year−1 for loamy sand soil. At the treatment level of 3 000 kg ha−1 4 year−1 of CaO, ~20% of the Ca-fertilizer can be leached after the liming treatment. The results of the CO2 concentration in the soil air may be useful in estimation of Ca-leaching from soils developed by slightly clayey sands and clayey sands in zones with a moderate climate.

Nitrogen fertilization raises CO2 efflux from inorganic carbon: A global assessment

“…The next step was to calculate the CO 2 efflux via agricultural lime dissolution. We calculated CO 2 efflux via agricultural lime dissolution based on the following assumptions: (1) the estimated surface area of acidified soils is 3.79 × 10 9 ha (Figure ), (2) the average annual application of lime is 1 ton per hectare (Chmiel et al., ) and (3) ca. 60% of the applied lime will be released as CO 2 to the atmosphere (West & McBride, ).…”

“…Dissolution of CaCO 3 via this anthropogenic source of acidity leads to CO 2 efflux Equation (6) (Chen, Wang, Luo, & Ye, 2013;Gandois, Perrin, & Probst, 2011) and loss of CaCO 3 , i.e., Ca 2+ leaching from the soil profile (Chmiel et al, 2016). For example, 46-95 kg CaCO 3 ha À1 year À1 has been lost following 12 years of application of 100 kg urea-N ha À1 year À1 (Conyers, Heenan, Poile, Cullis, & Helyar, 1996).…”

Effects of Temporal Variation in Long-Term Cultivation on Organic Carbon Sequestration in Calcareous Soils: Nile Delta, Egypt

“…In calcareous soils, calcium carbonate was efficiently stored in the deeper layers, and the acidity created through the nitrification process was neutralized through accelerating CaCO 3 depletion [47]. Dissolution of CaCO 3 via this anthropogenic source of acidity leads to CO 2 efflux and loss of CaCO 3 from the soil surface [48]. The application of acidifying fertilizers, such as ammonia and sulfur, reduced soil carbonate content during the cultivation process [49].…”