1.Agaba, H., Baguma Orikiriza, L.J., Esegu, O., Francis, J., Obua, J., Kabasa, J.D., and
Hüttermann, A. 2010. Effects of hydrogel amendment to different soils on plant available
water and survival of trees under drought conditions. J. Appl. Bas. Sci. 38: 328-335.
2.Amini, S., and Movahedi Naeini, S.A.R. 2013. Effects of paper mill Sludge application on
physical properties of an illitie loess slowly swelling soil with high specific surface area and
wheat yield in a temperate climate. J. Agric. Sci. 1: 295-313. (In Persian)
3.Bakass, M., Mokhlisse, A., and Lallemant, M. 2002. Absorption and desorption of liquid
water by a superabsorbent polymer: effect of polymer in the drying of the soil and the quality
of certain plants. J. Appl. Polym. Sci. 83: 234-243.
4.Bal, W., Zhang, H., Wu, L.Y., and Song, J. 2010. Effects of super- absorbent polymers on the
physical and chemical properties of soil following different wetting and drying cycles.
Geoderma. 26: 253-260.
5.Barzegar, A.S. 2002. Fundamentals of Soil Physics. Shahid Chamran University 215p.
(In Persian)
6.Buchholz, F.L., and Graham, A.T. 1997. The use of an hydrophilic polymer to improve water
storage and availability to crops grown in sand dunes. J. Appl. Bas. Sci. 16: 37-44.
7.Budiman, M., Alex, B., and Bratney, M. 2006. The dynamic penetrometer for assessment of
soil mechanical resistance. J. Puls. Res. 121: 16-27.
8.Chapman, H.D. 1965. Cation exchange capacity. P 891-901, In: C.A. Black (Ed.), Methods of
Soil Analysis. Part 2. American Society of Agronomy, Madison, Wis, USA.
9.Farrell, C., Ang, X.Q., and Rayner, J.P. 2013. Water-retention additives increase plant
available water in green roof substrates. Ecol. Eng. 52: 112-118.
10.Figueiredo, P.G., Bicudo, S.J., Chen, S., Fernandes, A.M., Tanamati, F.Y., and Djabou-
Fondjo, A.S.M. 2017. Effects of tillage options on soil physical properties and cassava-drymatter
partitioning. Field Crops Research. 204: 191-198.
11.Gerard, C.J., Mehth, H.C., and Hinojosa, F. 1972. Root growth in a clay soil. Soil Sci.
114: 37-49.
12.Green, C.H., Foster, C., Cardon, G.E., Butters, G.L., Brick, M., and Ogg, B. 2004. Water
release from cross-linked polyacrylamide. Colorado State University, Ft. Collins, CO,
Pp: 252-260.
13.Havlin, J.L., Beaton, J.D., Tisdale, S.L., and Nelson, W.L. 2005. Soil Fertility and Fertilizer.
Prentice Hall, USA.
14.Hosseini, M., Naeini, S.A.M., Dehghani, A.A., and Khaledian, Y. 2016. Estimation of soil
mechanical resistance parameter by using particle swarm optimization, genetic algorithm and
multiple regression methods. Soil and Tillage Research. 157: 32-42.
15.Hosseini, M., Roshani, Gh., and Movahedi Naeini, S.A.R. 2014. Effect of aggregate stability
indices on wheat yield in a soil with high specific surface under different tillage methods.
J. Soil Manage. Sust. Prod. 4: 122-138. (In Persian)
16.Huettermann, A., Zommorodi, M., and Reise, K. 1999. Addition of hydrogels to soil for
prolonging the survival of Pinus halepensis seedlings subjected to drought. Soil Tillage
Research. 50: 295-304.
17.Joudi, Z., and Movahedi Naeini, S.A.R. 2008. The effects of zeolite, LECA and compost on
soil water content and temperature. J. Soil Sci. 21: 35-46. (In Persian)
18.Kay, B.D., and To, J. 2005. Variation in penetrometer resistance with soil properties:
The contribution of effective stress and implications for pedotransfer functions. Geoderma.
126: 261-276.
19.Klute, A. 1986. Methods of soil analysis. Physical and Mineralogical Methods, Part I;
American Society of Agronomy, Soil Science Society of America, Madison, Wisconsin,
1188p.
20.Krik, P.L. 1950. Kjeldahl method for total nitrogen. Analytical chemistry. 22: 354-358.
21.Mc Lean, E.O. 1982. Soil pH and lime requirement. P 192-224, In: Page et al. (Eds.),
Methods of soil analysis (part II) Chemical and microbiological properties, American
Society of Agronomy, Inc., Soil Science Society of America, Inc. Publisher. Madison,
Wisconsin, USA.
22.Monnig, S. 2005. Water saturated super- absorbent polymers used in high strength concrete.
Otto- Graf- J. 16: 193-202.
23.Movahedi Naeini, S.A.R., and Rezaei, M. 2009. Soil Physics, Fundamentals and
applications. Gorgan, Iran: University of Agricultural Sciences and Natural Publications.
474p.
24.Movahedi Naeini, S.A.R., and Rezaei, M. 2009. Soil Physics, Fundamentals and
applications. Gorgan, Iran: University of Agricultural Sciences and Natural Publications.
445p.
25.Nazarli, H., Zardashti, M.R., Darvishzadeh, R., and Najafi, S. 2010. The effect of water
stress and polymer on water use efficiency, yield and morphological traits of sunflower
under greenhouse condition. Not. Sci. Biol. 2: 53-58. (In Persian)
26.Olsen, S.R., Cole, C.V., Watanabe, F.S., and Dean, L.A. 1954. Estimation of available P in
soils by extraction with sodium bicarbonate. U.S. Department of Agriculture, circular.
939: 1-19.
27.Panayiotis, A., Nektarios, K., Nikolopoulou, A.E., and Chronopulos, ISod establishment and
turf grass growth as affected by urea-formaldehyde rfoam soil amendment. Scientia Hort.
100: 203-213.
28.Pramila, A., Karun, K.C., Anil, K.S., and Debashis, C. 2006. Variation in soil strength and
rooting characteristics of wheat in relation to soil management. Geoderma. 136: 353-363.
29.Rao, C.S., and Takker, P.N. 1997. Evaluation of different extractants for measure in soil
potassium and determination of critical levels for plant available K in smectitic soils for
sorghum. J. Ind. Soc. Soil Sci. 45: 113-119.
30.Taban, M., and Movahedi Naeini, S.A.R. 2006. Effect of aquasorb and organic compost
amendment on soil water retention and evaporation with different evaporation and soil
texture. Communications in Soil Science and Plant Analysis. 37: 2031-2055.
31.Talebizadeh, E. 2009. The effect of calcium, ammonium and potassium based phosphorous
fertilizers on potassium uptake by rain-fed winter wheat in a potassium fixing loess soil with
a dominance of weathered mica in clay fraction. M.Sc. Thesis, Soil Science Department,
Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran.
(In Persian)
32.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: 1. 29-38.
33.Widiastuti, N., Wu, H., and Zhang, D.K. 2008. The potential application of natural zeolite
for grey water treatment Desalination. 218: 271-280.
34.Wu, L., Liu, M., and Liang, R. 2008. Preparation and properties of a double-coated
slow-release NPK compound fertilizer with superabsorbent and water-retention. Bioresource
Technol. 99: 547-554.
35.Yazdani, F., Allah Dadi, A., Akbari, Gh., and Behbahani, M. 2007. Effect amounts of
superabsorbent (Tarawat 200) and levels of water stress on yield and yield components of
soybean. J. Agron. Hort. 75: 1. 167-174. (In Persian)
)