Comparison of Potassium forms and Potassium Sorption Characteristics in Tobacco-Cultivated and Non-cultivated Soils in Northwest of Iran

Document Type : Research Paper

Authors

1 Soil science department, Agricultural faculty, Urmia university, Iran

2 2- Assosiate Prof., Soil Science Department, College of Agriculture, Urmia University, Iran

3 Prof., soil Science department, Agricultural faculty, Urmia university, Iran

4 4- Prof., Soil Science Department, College of Agriculture, Urmia University, Iran.

5 5- Assist. Prof., Soil Science Department, College of Agriculture, Urmia University, Iran.

6 6- Assist. Prof., Soil Science Department, College of Agriculture, Urmia University, Iran

Abstract

The present study was conducted to investigate the effect of cultivation on potassium forms and potassium adsorption characteristics behavior in tobacco-growing and adjacent virgin soils in Northwest of Iran. Soil potassium forms were determined in 29 tobacco-growing soils and in 29 adjacent virgin soils. Soil potassium quantity-intensity relations (Q/I) were constructed by equilibrating and shaking 2.5 g soil with 25 ml of 0.01 mM CaCl2. The results indicated that the mean of exchangeable potassium (Kex) and the initial equilibrium concentration of solution potassium (EKC) values in tobacco-growing soils were significantly (p≤0.01) lower than those in the adjacent virgin soils and decreased 28% and 27 %, respectively. Thus, in tobacco-growing soils and their adjacent virgin soils, the mean of Kex were 197 and 273 mg kg-1, and the mean of EKC were 7.9 and 10.8 mg L-1, respectively. There was a significant correlation between solution potassium (Kso) and Kex (r=0.418*) as well as between Kex and clay (r= 0.577**) in tobacco-growing soils indicating depletion of Kex  in the studied soils. The mean of potassium activity ratio at equilibrium (AReK) and the energy of exchange potassium (EK) values in tobacco-growing soils were significantly (p≤0.001) lower than those in the adjacent virgin soils and decreased 36 and 11 %, respectively. In tobacco-growing soils and their adjacent virgin soils, the mean of AReK were 0.004 and 0.0063 mol L-1and the mean of EK were -3407 and -3055 cal mol-1, respectively. Because of exchangeable potassium depletion in the studied soils, potassium fertilizer management is needed to be practiced for sustainable production of tobacco in Northwest of Iran.

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References

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Iranian Journal of Soil and Water Research
Volume 50, Issue 3
August 2019
Pages 653-664

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