Potassium status of two clayey calcareous soils treated with zeolite under wetting-drying cycles

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NAJAFI GHIRI M.; OWLIAIE H.R.

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Journal: Iran Agricultural Research Year:2019 | Volume:38 | Issue:1 Page(s): 15-22

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Title

Potassium status of two clayey calcareous soils treated with zeolite under wetting-drying cycles

Author(s)

NAJAFI GHIRI M. | OWLIAIE H.R. | Issue Writer Certificate

Keywords

Calcareous soilsQ1

K releaseQ1

Wetting-drying cyclesQ1

ZeoliteQ1

Abstract

Zeolite application to clayey soils may change potassium (K) pools distribution and its release rate. To test this hypothesis, two heavy-textured Calcareous soils with different mineralogy (smectitic and mixed by XRD) from southern Iran were selected. Experiment was a completely randomized factorial arrangement. Treatments consisted of two soils and two Zeolite levels (0 and 5%) and wetting-drying treatment. Soil samples were incubated in 50% of saturation percentage for 90 days. Then, three Wetting-drying cycles were done on samples. Different forms of K and K release to 0. 01 M CaCl2, HCl and CH3COOH by 12 successive 15 min extractions of soil samples were determined. Zeolite increased the content of different K forms in soil 1 (smectitic), while it increased soluble and exchangeable K and decreased non-exchangeable K in soil 2 (mixed mineralogy). This may be due to the high CEC (189 cmol(+)/kg) and K content (2. 13% K2O) of the used Zeolite. Wetting-drying cycles increased non-exchangeable K in soil 1 and exchangeable K in Zeolite treated soils. CaCl2 extracted more K than HCl and CH3COOH solutions (682, 281 and 292 mg kg-1, respectively) because Ca ions are more efficient than H ions in replacing K from surface sites in the K-bearing minerals. Zeolite and wetting-drying had no effect on K release from soil 1 while they significantly decreased K release rate from soil 2.

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APA: Copy

NAJAFI GHIRI, M., & OWLIAIE, H.R.. (2019). Potassium status of two clayey calcareous soils treated with zeolite under wetting-drying cycles. IRAN AGRICULTURAL RESEARCH, 38(1 ), 15-22. SID. https://sid.ir/paper/363903/en

Vancouver: Copy

NAJAFI GHIRI M., OWLIAIE H.R.. Potassium status of two clayey calcareous soils treated with zeolite under wetting-drying cycles. IRAN AGRICULTURAL RESEARCH[Internet]. 2019;38(1 ):15-22. Available from: https://sid.ir/paper/363903/en

IEEE: Copy

M. NAJAFI GHIRI, and H.R. OWLIAIE, “Potassium status of two clayey calcareous soils treated with zeolite under wetting-drying cycles,” IRAN AGRICULTURAL RESEARCH, vol. 38, no. 1 , pp. 15–22, 2019, [Online]. Available: https://sid.ir/paper/363903/en

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