Potassium Pools Distribution in Some Calcareous Soils as Affected by Climatic Conditions, Physiographic Units, and Some Physicochemical Properties in Fars Province, Southern Iran

— Experiments were conducted for thirty representative surface and subsurface soils collected from different physiographic units and moisture regimes in southern Iran to assess factors affecting K pools distribution and potassium release rate, using two organic and inorganic extractants and their as...

Full description

Saved in:
Bibliographic Details
Published in:Eurasian soil science 2021-05, Vol.54 (5), p.702-715
Main Authors: Azadia, Abolfazl, Shakeri, Sirous
Format: Article
Language:English
Subjects:
Alluvial fans
Analysis
Calcareous soils
Calcium
Calcium carbonate
Calcium carbonates
Calcium chloride
Carbonates
Cation exchange
Cation exchanging
Cations
Chemical properties
Chemicophysical properties
Chlorite
Clay
Clay minerals
Climatic conditions
Distribution
Earth and Environmental Science
Earth Sciences
Exchange capacity
Extractants
Foothills
Geotechnical Engineering & Applied Earth Sciences
Illite
Illites
Landforms
Mineralogy
Minerals
Oxalates
Oxalic acid
Palygorskite
Physicochemical processes
Physicochemical properties
Pools
Potassium
Potassium compounds
Smectite
Smectites
Soil
Soil analysis
Soil Chemistry
Soil moisture
Soil properties
Soil surfaces
Soils
Spatial distribution
Vermiculite
Vermiculites
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:— Experiments were conducted for thirty representative surface and subsurface soils collected from different physiographic units and moisture regimes in southern Iran to assess factors affecting K pools distribution and potassium release rate, using two organic and inorganic extractants and their association to mineralogy and some physical and chemical properties in calcareous soils. Mineralogical analysis indicated that illite, smectite, chlorite and palygorskite were the main clay minerals in the studied soils. The highest content of illite and smectite was observed in the piedmont plain (P.P) units, whereas that of smectite in Lowland (L.L) unit was higher than in soils of alluvial fans (A.F). It seems that the P.P unit which is in more stable landform position contains larger amounts of all K compounds due to higher clay and illite contents. The exchangeable, non-exchangeable (NEK), structural, and total potassium were found to be significantly and positively correlated to the clay content, cation exchange capacity, and the contents of illite, smectite, and vermiculite minerals, while a negative correlation as observed between the mentioned K forms and the calcium carbonate (CaCO 3 ) content. The cumulative rate of K release to 0.01 M CaCl 2 and oxalic acid was examined for a period of 1200 h, ranging within 104–286 and 87–233 mg kg –1 for the surface soil and 98–241 and 82–211 mg kg –1 for the subsurface soil samples, respectively. The percentage of non-exchangeable K released varied greatly between the different units and moisture regimes. Higher values of NEK release were observed for P.P followed by A.F, and L.L units. Considering the obtained values of the highest amount of potassium compounds as well as the release values in the piedmont plain physiographic unit and the xeric moisture regime as well as the Alfisols, the results confirm that in addition to physicochemical and mineralogical properties, physiographic units and soil moisture regimes also play a key role in nature and in spatial distribution of different forms of potassium.
ISSN:1064-2293
1556-195X
DOI:10.1134/S1064229321050021