1.Akhtar, M.S., and Dixon, J.B. 2009.
Mineralogical characteristics and
potassium quantity/intensity relation in
three Indus River Basin soils. Asian J.
Chem. 21: 5. 3427-3442.
2.Ali, W., Muhammad, H., Mujahid, A.,
Muhammad, M., Muhammad, A.R.T.,
Muhammad, M., and Hafiz, A.A.N. 2013.
Evaluation of Freundlich and Langmuir
Isotherm for Potassium Adsorption
Phenomena. Inter. J. Agric. Crop Sci.
6: 15. 1048-1054.
3.Bahmani, M., Salehi, M.H., and
Hosseinpoor, A. 2012. The studying Q/I
parameters of potassium in the calcareous
soils of arid and semiarid regions in
Isfahan and Chaharmahal-Va-Bakhtiari
provinces. J. Water Soil. 26: 2. 349-360.
(In Persian)
4.Barber, S.A. 1984. Soil nutrient
bioavailability. A mechanistic approach.
John Wiley and Sons, New York, 397p.
5.Beckett, P.H.T. 1964. Studies on soil
potassium: II. The immediate Q/I
relations of labile potassium in the soil.
J. Soil Sci. 15: 9-23.
6.Beckett, P., and Brady, N.C. 1972.
Critical cation activity ratios. Advances in
Agronomy. 24: 379-412.
7.Bouyoucos, G.J. 1962. Hydometr method
improved for making particle size
analysis of soils. Agron. J. 54: 464-465.
8.Chapman, H.D. 1965. Cation exchange
capacity. In: Methods of soil analysis.
Part 2. Black, C.A. (ed.). American
Society of Agronomy, Madison,
Wisconsin, USA.
9.Cox, A.E., Joern, B.C., Brouder, S.M.,
and Gao, D. 1999. Plant-available
potassium assessment with a modified
sodium tetra phenyl boron method. Soil
Sci. Soc. Amer. J. 63: 4. 902-911.
10.Davies, C.W. 1962. Ion Association.
Butterworths, London, Pp: 37-53.
11.Del-Bubba, M., Arias, C.A., and Brix,
H. 2003. Phosphorus adsorption
maximum of sands for use as media in
sub-surface flow constructed reed beds
as measured by the Langmuir isotherm.
Water Resource, 37: 3390-3400.
12.Dobermann, A., and Fairhurst, T. 2000.
Rice: Nutrient disorders & Nutrient
management. Handbook series. Potash
& Phosphate Institute (PPI), Potash &
Phosphate Institute of Canada (PPIC)
and International Rice Research Institute.
191p.
13.Dordipour, E., and Gholizadeh, A.L.
2009. Q/I parameters of potassium in the
soils of Mazandaran under tobacco
cultivation. J. Plant Prod. 16: 1. 1-16.
(In Persian)
14.Dovlati, B., Oustan, S.H., and Samadi,
A. 2008. Forms of potassium and Q/I
relationship for sunflower growing
soils in Khoy region. J. Agric. Sci.
Technol. Natur. Resour. 12: 46. 623-636.
(In Persian)
15.Fathi, S., Samadi, A., Davari, M., and
Asadi Capurchal, S. 2014. Evaluation
different Extractants for determining
corn available potassium in some
calcareous soils of Kurdistan province.
J. Cereals. 4: 3. 253-266. (In Persian)
16.Gholizadeh, A.Gh., Karimi, A.R.,
Khorasani, R., and Khormali, F. 2016.
Different forms of soil potassium in
tobacco cultivated areas of northern
Iran. J. Water Soil Cons. 23: 4. 1-23.
(In Persian)
17.Helmke, P.A., and Sparks, D.L.
1996. Lithium, sodium and potassium.
P 551-574, In: D.L. Sparks, A.L. Page,
P.A. Helmke, R.H. Loeppert, P.N.
Sultanpour, M.A. Tabatabai, C.T.
Jhonston, and M.E. Sumner (Eds.),
Methods of Soil Analysis, Part 2,
Chemical and Microbiological Properties,
Soil Science Society of American, WI.
USA.
18.Khormali, F., Nabiollahy, K., Bazargan,
K., and Eftekhari, K. 2008. Potassium
status in different soil orders of Kharkeh
Research Station, Kurdistan. J. Agric.
Sci. Technol. Natur. Resour. 14: 5. 1-9.
(In Persian)
19.Knudsen, D., Peterson, G.A., and Pratt,
P.F. 1982. Lithium, sodium and
potassium. P 225-246, In: A.L. Page
et al. (eds), Methods of Soil Analysis,
Part 2, Chemical and Microbiological
properties, 2nd ed., WI: ASA and SSSA,
Madison.
20.Le Roux, J., and Sumner, M.E. 1968.
Labile potassium in soils: 1. Factors
affecting the quantity intensity (Q/I)
parameters. Soil Science. 106: 1. 35-41.
21.Loeppert, R.H., and Suarez, D.L. 1996.
Carbonate and gypsum. P 437-474,
In: D.L. Sparks (ed.), Methods of soil
analysis, Part 3, 3rd ed., WI: SSSA,
ASA. Madison.
22.Marchand, M. 2010. Effect of potassium
on the production and quality of tobacco
leaves. Optimum Crop Nutrition. 24: 7-14.
23.Martin, H.W., and Sparks, D.L. 1985.
On the behavior of non- exchangeable
potassium in soils. Communications
in Soil Science and Plant Analysis.
16: 133-162.
24.McLean, E.O. 1976. Exchangeable K
levels for maximum crop yields on soils
of different cation exchange capacities.
Communications in Soil Science and
Plant Analysis. 7: 823-838.
25.McLean, E.O., and Watson, M.E. 1985.
Soil measurement of plant- available
potassium. P 277-308, In: RD Munson
(ed), Potassium in agriculture, ASA,
CSSA, SSSA, Madison.
26.Najafi-Ghiri, M., Abtahi, A., and
Jaberian, F. 2012. Potassium release
from sand, silt and clay fractions in
calcareous soils of southern Iran.
Archive of Agronomy and Soil Science.
58: 12. 1439-1425.
27.Peyghami Khoshemehr, H., Sepehr, E.,
and Momtaz, H.R. 2015. Comparison of
potassium sorption characteristics of
cultivated and virgin soils in Khoy region.
Applied Soil Research, 2: 2. 18-28.
(In Persian)
28.Poonia, S.R., and Niederbudde, E.A.
1990. Exchange equilibria of potassium
in soil, V. Effect of natural organic
matter on K-Ca exchange. Geoderma.
47: 3-4. 233-242.
29.Richmond, M.D., Pearce, R.C., and
Bailey, W.A. 2016. Dark fire- cured
tobacco response to potassium and
application method. Tobacco Science.
53: 12-15.
30.Samadi, A. 2006. Potassium exchange
isotherms as a plant availability index in
selected calcareous soils of Western
Azerbaijan Province, Iran. Turk. J.
Agric. Forest. 30: 3. 213-222.
31.Samadi, A., Dovlati, B., and Barin, M.
2008. Effect of continuous cropping on
potassium forms and potassium
adsorption characteristics in calcareous
soils of Iran. Austr. J. Soil Res.
46: 265-272.
32.Schnidler, F.V., Woodard, H.J., and
Doolittle, J.J. 2005. Assessment of soil
potassium sufficiency as related to
quantity-intensity in montmorillonitic
soils. Communications in Soil Science
and Plant Analysis, 36: 15-16. 555-570.
33.Sharma, R.R., Mukhopadhyay, S.S., and
Sawhney, J.S. 2006. Distribution of
potassium fractions in relation to
landform in a Himalayan catena.
Archive of Agronomy and Soil Science.
52: 4. 469-476.
34.Sharpley, A.N., and Buol, S.W.
1987. Relationship between minimum
exchangeable potassium and soil
taxonomy 1. Communications in
Soil Science and Plant Analysis.
18: 5. 601-614.
35.Shaviv, A., Mohsen, M., Pratt, P.F.,
and Mattigod, S.V. 1985. Potassium
fixation charectristics of five southern
California soils. Soil Sci. Soc. Amer. J.
49: 1105-1109.
36.Sing, B.B., and Jones, J.P. 1975. Use of
sorption-isotherms for evaluating
potassium requirements of plants. Soil
Sci. Soc. Amer. J. 39: 5. 881-886.
37.Srinivasarao, C., Rupa, T.R., Subba Rao,
A., Ramesh, G., and Bansal, S.K. 2006.
Release kinetics of nonexchangeable
potassium by different extractants from
soils of varying mineralogy and depth.
Communications in soil science and
plant analysis. 37: 3-4. 473-491.
38.Tandon, H.L.S. 1998. Methods of
analysis of soils, plant, water and
fertilizer. Development and Consultation
Organization, New Delhi, India. 203p.
39.Villapando, V.S., and Graetz, D.A.
2001. Phosphorus sorption and
desorption properties of the spodic
horizon from selected Florida spodosols.
Soil Sci. Soc. Amer. J. 65: 331-339.
40.Walkley, A., and Black, I.A. 1934. An
examination of the Degtjareff method
for determining soil organic matter and a
proposed modification of the chromic
acid titration method. Soil Science.
37: 29-38.
41.Wang, J., Fu, B., Qiu, Y., and Chen, L.
2001. Soil nutrients in relation to land
use and landscape position in the semiarid small catchment on the loess
plateau in China. J. Arid Environ.
48: 4. 537-555.
42.Zareian, G.R., Farpoor, M.H., Hejazi,
M., and Jafari, A. 2017. Relationship
of potassium forms with soil
physicochemical properties and clay
mineralogy in Ghrehbagh Plain, Fars
Province. J. Soil Res. (Soil and Water
Science). 31: 2. 315-328. (In Persian)