Ajiboye, G. A. and Ogunwale, J. A. (2008). Potassium distribution in the sand, silt and clay separates of soils developed over talc at Ejiba, Koji State, Nigeria. World Journal of Agricultural Sciences, 4 (6). 709-716.
Ali Ehiaie, M. and Behbahani S. (1998). Methods of the soil chemical analysis. Soil and water research institu. Technical report No.1024. (In Farsi)
Andrist-Rangel, Y., Hillier, S., Öborn, I.,Lilly, A.,Towers, W.,Edwards, A. and Paterson, E. (2010). Assessing potassium reserves in northern temperate grassland soils: A perspective based on quantitative mineralogical analysis and aqua-regia extractable potassium. Geoderma, 158. 303-314.
Bostani, A., Savaghebi, Gh. (2011). Study of Potassium Fixation Capacity in Some Under-Cultivation Sugarcane Soils in Khuzestan. Journal of water and Soil, 25. 282-993.
Bouabid, R., Badraoui, M. and Bloom, P. R. (1991). Potassium fixation and charge characteristics of soil clay. Soil Science Society of America Journal, 55. 1493-1498.
Chapman, H.D. (1965). Cation exchanges capacity. PP. 891-901. In: Black, C. A (Eds.), Methods of soil analysis. Part 2. Chemical analysis. American Society of Agronomy. Madison, Wisconsin.
Dhaliwal, A. K., Gupta, R. K., Singh, Y. and Singh, B. (2006). Potassium fixation and release characteristics of some benchmark soil series under rice-wheat cropping system in the indo-gangetic plains of northwestern India. Communications in Soil Science and Plant Analysis, 7. 827-845.
Farshadirad, A., Dordipour, E. (2015). Contribution of Soil and Soil Fractions' (Clay and Silt) Exchangeable and Nonexchangeable Potassium to Available Potassium for Corn Plant in Loess-Like and Loess-Derived Soils of Golestan Province. ournal of Sciences and Technology of Agriculture and Natural Resources, 19 (72). 269-279. (In Farsi)
Farshadirad, A., Dordipour, E., khormali, F. and Kiani, F. (2011). Potassium forms in soil and its separates in some loess and loess-like soils of Golestan providence, Journalof Water and Soil Conservation, 18(3). 1-16. (In Farsi)
Fotyma, M. (2007). Content of potassium in different forms in the soils of southeast Poland. Polish journal of soil science, 1.19-31.
Gee, G.W. and Bauder, J.W. (1986). Particle-Size analysis. PP. 383-411. In: Klute, A. (Eds.), Methods of soil analysis. Part7. Soil Science Society of American.
Ghorban Lovineh, N., Jafari, S. and Khalili Moghadam, B. (2015). Study of clay minerals diversity in young soils derived from marine sediments. 22th symposium of crystallography and mineralogy of Iran. Shiraz University, Iran.
Grim, R.E. (1968). Clay mineralogy. International series in earth and planetary sciences. McGraw-Hill, New York.
Hashemi, S. S. and Abbaslou, H. (2016). Potassium reserves in soils with arid and semi-arid climate in southern Iran: a perspective based on potassium fixation. Iran Agriculture Research, 35(2). 88-95.
Hosseinpur, A. and Panahi, M. (2010). Potassium Fixation Capacity and Charge Characteristics in Some Calcareous Soils of Hamadan Province. Journal of Water and Soil Science, 14(52). 65-73. (In Farsi)
Jackson, M.L. (1975). Soil chemical analysis-advanced course. University of Wisconsin, College of Agric., Department of Soils, Madison, WI.
Jafari, S. (2014). The effect of soil forming factors on the amount and diversity of clay minerals in the soils and deposits originated from Karoon in Khuzestan province, Final report of project NO. 14/931, 2014. (In Farsi)
Jafari, S. and Baghernejad, M. (2007). Effects of Wetting and Drying, and Cultivation Systems on Potassium Fixation in Some Khouzestan Soils. Journalof Child Psychology & Psychiatry, 11 (41). 75-90. (In Farsi)
Jafari, S. and Nadian, H. (2014). The study of a toposequence soil series and clay mineral assemblage in some soils of Khuzestan province.Journal of water and soil science, Isfahan University of Techonlogy, 18(69). 151-164. (In Farsi)
Jafari, S., Baghernejad, M. and Chorom, M. (2006). Evaluation of changes in physic-chemical properties in cultivated (under sugarcane and rotation cropping) and no cultivated soils in Haft- Tappeh(Iran). The scientific journal of agriculture, 28(1): 165-182. (In Farsi)
Jafari, S., Porkayhan, S., Shane Dashtgol, A. and Hosinzadeh, E. (2010). Study of correlation between soil K content with uptake K by sugarcane. 11th soil science congress. Gorgan. Iran. (In Farsi)
Karimi Moridani, M. (2015). K importance in the paddy soil fertility. Periodical journal of agriculture and natural resources, 12(44): 33-39. (In Farsi)
Khodabakhshi, S. (2014). Study the effects of relief on the soils development and clay minerals assemblage in Izeh plain. Master thesis, Ramin University of Agriculture and Natural Resources.(In Farsi)
Khormali, F., Nabiollahy, K., Bazargan, K. and Eftekhari, K. (2007). Potassium status in different soil orders of Kharkeh Research Station, Kurdestan. Journalof Agriculture and Natural Resources, 14(5). (In Farsi)
Korb, N., Jones, C. and Jacobsen, J. (2002). Potassium cycling, testing, and fertilizer recommendations. Nutrient Management. Module No.5. Montana State University.
Mclean, E.O. and Watson, M. E. (1985). Soil measurement of plant available of potassium. PP. 277-308. In: Munson, R.D. (Ed.), Potassium in agriculture. American Society of Agronomy: Madison, WI.
Mehra, O. P. and Jackson, M. L. (1960). Iron oxide removal from soils and clays by a dithionite citrate system buffered with sodium bicarbonate. Clays and Clay Minerals, 7. 317 -327.
Meyer, J. H. and Wood, R. A. (1985). Potassium nutrition of sugarcane in South African sugar industry. In: Proceedings of the Potassium Symposium, Pretoria, pp. 205-213.
Moritsuka, N., Yanai, J. and Kosaki, T. (2002). Depletion of nonexchangeable potassium in the maize rhizosphere and its possible releasing processes. 17th World Congress of Soil Science. Bangkok, Thailand.
Najafi Ghiri, M. and Abtahi, A. (2013). Potassium Fixation in Soil Size Fractions of Arid Soils. Soil and Water Research, 2. 49-55.
Najafi-Ghiri, M., Abtahi, A. and Jaberian, F. (2012). Potassium release from sand, silt and clay fractions in calcareous soils of southern Iran. Archives of Agronomy and Soil Science, 58(12). 1439-1425.
Nelson, R.E. (1982). Carbonate and gypsum. P. 181-199. In: Page, A.L. (Eds.), Methods of soil Analysis. Part 2. American Society of Agronomy. Madison, Wisconsin.
Nieder, R., Benbi, D. K. and Scherer, H. W. (2011). Fixation and de-fixation of ammonium in soils. Boil Fertile Soils.
Biology and Fertility of Soils, 47(1). 1-14.
Pishgir, M. and Jafari, S. (2014). Comparison between potassium and ammonium fixation by clays in different agriculture systems. Journal of water and soil science, Isfahan University of Technology, 18(63). 237-250. (In Farsi)
Sardi, K. and Csitari, G. (1998). Potassium fixation of different soil types and nutrient levels. Commun. Soil Science and Plant Analysis, 29.1843-1850.
Simonsson, M., Hillier, S. and Oborn, I. (2009). Changes in clay minerals and potassium fixation capacity as a result of release and fixation of potassium in long-term field experiments. Geoderma, 151(3). 109-120.
Sparks, D. L. (1987). Potassium dynamics in soils. Advances in Soil Sciences, 6. 1-63.
Sparks, D. L. and Huang, P. M. (1985). Physical Chemistry of soil potassium. PP. 201-276. In: Munson, R.D. (Ed.), Potassium in Agriculture. SSSA, Madison, Wisconsin.
Sparks, D.L. (2000). Bioavailability of soil potassium. P.38-53. In: Sumner, M.E. (Ed.), Handbook of Soil Science.CRD Press. Boca Raton FL.
Tributh, H., E. V. Boguslawski, A. V. Lieress, D. Steffens and K. Mengel. 1987. Effect of potassium removal by crops on transformation of illitic clay minerals. Soil. Sci. 143:404-409.
United State Salinity Laboratory Staff. (1954). Diagnosis and improvement of saline and alkali soils, USDA Handbook. 60. Washington, DC.
Walkley, A. and I.A. Black. (1934). An examination of the digestion for determining soil organic matter and a proposed modification of the chromic acid titration method. Soil Science. 37: 29-38
Wang, J. G., F. S. Zhang, Y. P. Cao and X. L. Zhang. 2000. Effect of plant types on release of mineral potassium from gneiss. Nutrient Cycling in Agroecosystems 56: 37–44.
Zaker Moshfegh, A. (2016). Studyof soils development and clay minerals assemblages of Karun, Karkheh and Zohreh Rivers alluvials. Master of sciences thesis, Ramin University of Agriculture and Natural Resources. (In Farsi)