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אסיף מאגר המחקר החקלאי
פותח על ידי קלירמאש פתרונות בע"מ -
Native CaCO3 mineral dissolution and its contribution to sodic calcareous soil reclamation under laboratory conditions
Year:
2008
Source of publication :
Arid Land Research and Management
Authors :
קרן, רמי
;
.
Volume :
22
Co-Authors:
Li, F., China Agricultural University, Beijing, China, China Agricultural University, P.O. Box 295, 17 Qinghua Donglu, Beijing 100083, China
Keren, R., Institute of Soil, Water and Environment Sciences, Agricultural Research Organization, Volcani Center, Bet Dagan, Israel
Facilitators :
From page:
1
To page:
15
(
Total pages:
15
)
Abstract:
Efficient and sustainable reclamation of sodic soils is important to agricultural production. With the help of a peristaltic pump, laboratory-leaching experiments for sodic calcareous soils with exchangeable sodium percentage (ESP) of 1, 12.5, and 19 were conducted under atmospheric CO2 partial pressure to investigate native CaCO3 mineral dissolution and its contribution to the rehabilitation of moderate sodium-affected soils at the water flow velocities of 2 and 18 mm h-1, respectively. The electrical conductivity (EC), pH, and the Ca2+, Mg2+, Na+, K+, Cl-, and HCO3- concentrations in the leachates were measured. The exchangeable Na+ contents in the soils after leaching were measured and their ESPs were calculated. Results indicated that both soil sodicity and water flow velocity significantly affected native CaCO3 dissolution and sodic soil reclamation. Almost all of the Ca2+ to substitute the adsorbed Na+ came from the native CaCO3 dissolution. The CaCO3 dissolution rate decreased logarithmically with leachate volume and increased with the initial ESP level. The leachate EC increased with the initial soil ESP level and decreased with flow velocity. The total detected cation concentrations in the leachates within the first six pore volumes (PV) were greater than 3.0-4.6 mmolc L-1.Low flow velocity was favorable to the improvement of the reclamation rate and reclamation efficiency of sodic soils. After the leaching of six PV, 24.1-36.0% of the Na+ adsorbed in the soils with initial ESPs of 12.5 and 19 were removed. Without the aid of extraneous chemical amendments, the gradual reclamation of moderate sodic calcareous soils under suitable management is possible. Copyright © Taylor & Francis Group, LLC.
Note:
Related Files :
agricultural production
calcareous soil
Leaching experiment
soil chemistry
Soil sodicity
water flow
עוד תגיות
תוכן קשור
More details
DOI :
10.1080/15324980701784225
Article number:
0
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
21842
Last updated date:
02/03/2022 17:27
Creation date:
16/04/2018 23:47
Scientific Publication
Native CaCO3 mineral dissolution and its contribution to sodic calcareous soil reclamation under laboratory conditions
22
Li, F., China Agricultural University, Beijing, China, China Agricultural University, P.O. Box 295, 17 Qinghua Donglu, Beijing 100083, China
Keren, R., Institute of Soil, Water and Environment Sciences, Agricultural Research Organization, Volcani Center, Bet Dagan, Israel
Native CaCO3 mineral dissolution and its contribution to sodic calcareous soil reclamation under laboratory conditions
Efficient and sustainable reclamation of sodic soils is important to agricultural production. With the help of a peristaltic pump, laboratory-leaching experiments for sodic calcareous soils with exchangeable sodium percentage (ESP) of 1, 12.5, and 19 were conducted under atmospheric CO2 partial pressure to investigate native CaCO3 mineral dissolution and its contribution to the rehabilitation of moderate sodium-affected soils at the water flow velocities of 2 and 18 mm h-1, respectively. The electrical conductivity (EC), pH, and the Ca2+, Mg2+, Na+, K+, Cl-, and HCO3- concentrations in the leachates were measured. The exchangeable Na+ contents in the soils after leaching were measured and their ESPs were calculated. Results indicated that both soil sodicity and water flow velocity significantly affected native CaCO3 dissolution and sodic soil reclamation. Almost all of the Ca2+ to substitute the adsorbed Na+ came from the native CaCO3 dissolution. The CaCO3 dissolution rate decreased logarithmically with leachate volume and increased with the initial ESP level. The leachate EC increased with the initial soil ESP level and decreased with flow velocity. The total detected cation concentrations in the leachates within the first six pore volumes (PV) were greater than 3.0-4.6 mmolc L-1.Low flow velocity was favorable to the improvement of the reclamation rate and reclamation efficiency of sodic soils. After the leaching of six PV, 24.1-36.0% of the Na+ adsorbed in the soils with initial ESPs of 12.5 and 19 were removed. Without the aid of extraneous chemical amendments, the gradual reclamation of moderate sodic calcareous soils under suitable management is possible. Copyright © Taylor & Francis Group, LLC.
Scientific Publication
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