Volume 175, Issue 6 pp. 827-839
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The effects of freeze-and-thaw cycles on phosphorus availability in highland soils in Turkey

Müdahir Özgül

Müdahir Özgül

Atatürk University, Faculty of Agriculture, Department of Soil Science and Plant Nutrition, 25240, Erzurum, Turkey

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Adem Günes

Adem Günes

Atatürk University, Faculty of Agriculture, Department of Soil Science and Plant Nutrition, 25240, Erzurum, Turkey

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Aslihan Esringü

Aslihan Esringü

Atatürk University, Faculty of Agriculture, Department of Soil Science and Plant Nutrition, 25240, Erzurum, Turkey

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Metin Turan

Corresponding Author

Metin Turan

Atatürk University, Faculty of Agriculture, Department of Soil Science and Plant Nutrition, 25240, Erzurum, Turkey

Atatürk University, Faculty of Agriculture, Department of Soil Science and Plant Nutrition, 25240, Erzurum, TurkeySearch for more papers by this author
First published: 03 July 2012
Citations: 13

Abstract

Ongoing global warming may result in colder soil and thawing cycles and will increase the frequency of soil freezing-and-thawing-treated cycles (FTCs) during winter in the cool-temperate and high-latitude regions. The purpose of this study was to determine the effects of repeated freeze–thaw cycles on the solubility and adsorption of P in lab and field experiments on Pellustert, Argiustoll, Haplustept, Fluvaquent, and Calciorthid soils, the major soil groups in E Turkey. The results demonstrated that, depending on the soil type, the freeze–thaw cycle could increase the adsorption and desorption of P within a certain temperature range. Repeated freezing and thawing decreased equilibrium P concentration (EPC) and increased P adsorption. EPC and P adsorption were strongly correlated with the number of FTCs. The highest P adsorption and the lowest P desorption was found in Pellustert followed by Argiustoll, Calciorthid, Haplustept, Fluvaquent when refrozen at –10°C for 15 d, then thawed at +2.5°C for 18 h, and 9 times FTC. However, in the field study, the adsorption value was lower than the value obtained from the laboratory condition. It appears that increasing the frequency of freeze–thaw processes depending on increase in temperature that leads to decreased plant-available soil P pools, thus requires more P fertilizer in soil solution to supply adequate P during the plant-growth period.

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