1- Aparicio V., and Costa J.L. 2007. Soil quality indicators under continuous cropping systems in the Argentinean Pampas. Soil & Tillage Research, 96: 155–165.
2- Asgarzadeh H., Mosaddeghi M.R., Mahboubi A.A., Nosrati A., and Dexter A.R. 2010. Soil water availability for plants as quantified by conventional available water, least limiting water range and integral water capacity. Plant Soil, 335: 229–244.
3- Da Silva A.P., and Kay B.D. 1997. Estimating least limiting water range of soils from properties and management. Soil Science Society of American Journal, 61: 877–883.
4- Da Silva A.P., and Kay B.D. 2004. Linking process capability analysis and least limiting water range for assessing soil physical quality. Soil & Tillage Research, 79: 167–174.
5- Da Silva A.P., Kay B.D., and Perfect E. 1994. Characterization of the least limiting water range of soils. Soil Science Society of American Journal, 58: 1775–1781.
6- Groenevelt P.H., Grant C.D., and Semetsa S. 2001. A new procedure to determine soil water availability. Australian Journal of Soil Research, 39: 577–598.
7- Hao X., Ball B.C., Culley J.L.B., Carter M.R., and Parkin G.W. 2007. Soil density and porosity. p. 743-760. In: Carter M.R., and Gregorich E.G. (ed.) Soil Sampling and Methods of Analysis. 2nd ed. Canadian Society of Soil Science. Taylor and Francis.
8- Imaz M.J., Virto I., Bescansa P., Enrique A., Ugalde O.F., and Karlen D.L. 2010. Soil quality indicator response to tillage and residue management on semi-arid mediterranean cropland. Soil & Tillage Research, 107:17–25.
9- Kroetsch D., and Wang C. 2007. Particle size distribution. p. 713–725. In: Carter M.R., and Gregorich E.G. (ed.) Soil Sampling and Methods of Analysis. 2nd ed. Canadian Society of Soil Science. Taylor and Francis.
10- Letey J. 1985. Relationship between soil physical properties and crop production. Advanced Soil Science, 1: 277–294.
11- Reynolds W.D., and Clarke Topp G. 2007. Soil water desorption and imbibition: tension and pressure techniques. p. 981-997. In: Carter M.R., and Gregorich E.G. (ed.) Soil Sampling and Methods of Analysis. 2nd ed. Canadian Society of Soil Science. Taylor and Francis.
12- Reynolds W.D., Drury C.F., Tan C.S., Fox C.A., and Yang X.M. 2009. Use of indicators and pore volume-function characteristics to quantify soil physical quality. Geoderma, 152: 252– 263.
13- Reynolds W.D., Drury C.F., Yang X.M., Fox C.A., Tan C.S., and Zhang T.Q. 2007. Land management effects on the near-surface physical quality of a clay loam soil. Soil & Tillage Research, 96: 316–330.
14- Reynolds W.D., Drury C.F., Yang X.M., and Tan C.S. 2008. Optimal soil physical quality inferred through structural regression and parameter interactions. Geoderma, 146:466– 474.
15- Sahebjame A.A. 2002. The precise detailed study of soil and land classification of Torogh (Khorasan-Razavi) agricultural research station. Final report, 1146. Soil and Water Research Institute. (in Persian)
16- Skjemstad J.O., and Baldock J.A. 2007. Total and organic carbon. p. 225-237. In: Carter M.R., and Gregorich E.G. (ed.) Soil Sampling and Methods of Analysis. 2nd ed. Canadian Society of Soil Science. Taylor and Francis.
17- Ugalde O.F., Virto I., Bescansa P., Imaz M.J., Enrique A., and Karlen D.L. 2009. No-tillage improvement of soil physical quality in calcareous, degradation-prone, semiarid soils. Soil & Tillage Research, 106: 29–35.