Fatahi KE. Fotovvat A. Astaraei A and Haghnia G. 2010. Lead phytoextraction from soil by corn, sunflower, and cotton applying EDTA and sulfuric acid . J. Water Soil Sci, Isfahan Uni. Tech. 14 (51): 57-69
Allison LE and Moodie CD. 1965. Carbonate. In: Black CA. (Ed). Methods of soil analysis. Part 2. Agron. 9. Am. Soc. Agron. Madison, WI. PP. 1379- 1396.
Alloway BJ. 1995. Soil processes and the behavior of metals. In:Alloway BJ (Eds.). Metals in soils. Blackie Academic and Professional, London. pp. 38–57.
Almas AR. Singh BR and McBride MB. 2000. Solubility and lability of cadmium and zinc in two soils treated with organic matter. Soil Sci. 165:250-259.
Benjawan C. Chutichudet P and Kaewsit S. 2007. Effect of green manures on growth, yield and quality of green Okra (Abelmoschus esculentus L.) har Lium cultivar. Pakistan J. Biol. Sci. 10 (7):1028-1035.
Bremner JM and Keeney DR. 1966. Determination and isotope-ratio analysis of different forms of nitrogen in soils: Exchangeable ammonium, nitrate, and nitrite by extraction distillation methods. Soil Sci. Soc. Am. Proc. 30:577-582.
Chairidchai P and Ritchie GSP. 1992. The effect of pH on zinc adsorption by a lateritic soil in the presence of citrate and oxalate. Soil Sci. 43:723-728.
Chapman HD. 1965. Cation Exchange Capacity. In: Black CA. (Ed.), Methods of soil analysis. Part 2. Agron. 9 . Am. Soc. Agron., Madison, WI. PP. 891-901.
Gee GW and Bauder JW. 1986. Particle-size analysis. In: Klute A (ed.). Methods of Soil Analysis, part 1. Vol 9. ASA and SSSA. Madison, WI. pp. 383-412.
Harter RD. 1991. Micronutrient adsorption-desorption reactions in soils. In: Mortvedt JJ et al. (Ed.). Micronutrients in Agriculture. 2nded., SSSA, Madison, WI. pp. 59-87
Hseu ZY. 2006. Extractability and bioavailability of zinc over time in three tropicalsoils incubated with biosolids. Chemosphere, 63:762–771.
Iyengar SS. Martens DC and Miller WP. 1981. Distribution and plant availability of soil zinc fractions. Soil Sci. Soc. Ame. J. 45:735-739.
Jones DL And Darrah PR. 1994. Role of root derived organic acids in the mobilization of nutrients from the rhizosphere. Plant and Soil, 166: 247–257.
Jung C. Maeder V. Funk F. Frey B. Sticher H and Frossard E. 2003. Release of phenols from Lupinus albus L. roots exposed to Cu and their possible role in Cu detoxification. Plant Soil, 252: 301–312.
Kabata-Pendias A and Pendias H. 2000. Trace elements in soil and plants. Third ed, CRC press, Bokarton, London, New York. Washington, D.C.
Krishnamuriti GSR. Cieslinski G. Huang PM and Vanrees KCJ. 1997. Kinetics of cadmium release from soils as influenced by organic acid: Implication in cadmium availability. Environ. 26: 271-277.
Ksouri R. Debez A. Mahmoudi H. Ouerghi Z. Gharsalli M. Kozak M and Rostad HPW. 1995. Speciation of particulate-bound cadmium of soils and its bioavailability. Analyst. 120(3): 659-665.
Kuo S. 1996. Phosphorus. In: Sparks DL. (Ed.) Methods of soil analysis, Part 3, SSSA Book Series, no. 5. Agronomy Society of America and Soil Sci. Soc. Am. Madi. WI.
Lindsay WL and Norvell WA. 1978. Development of a DTPA soil test for zinc, iron, manganese and copper. Soil Sci. Soc. Am. J. 42:421-428.
Marchiol L. Assolari S. Sacco P and Zerbi G. 2004. Phytoextraction of heavy metals by canola (Brassica napus) and radish (Raphanus sativus) grown on multi contaminated soil. Environ Pollut. 132: 21-27.
McGrath SP and Cunliffe CH.1985. A simpliﬁed method for the extraction of the metals Fe, Zn, Cu, Ni, Cd, Pb, Cr, Co and Mn from soils and sewage sludges. J Sci Food Agric. 36:794–798.
McGrath SP. Shen ZG. and Zhao FJ. 1997. Heavy metal uptakeand chemical changes in the rhizosphere of Thlaspi caerulescens and Thlaspi ochroleucum grown in contaminated soils. Plant and Soil, 188:153-159.
McGrath SP. Zhao FJ and Lombi E. 2001. Plant and rhizosphere processes involved in phytoremediation of metal-contaminated soils. Plant and Soil, 232: 207–214.
Mench M and Fargues S. 1994. Metal uptake by iron-efficient and inefficient oats. Plant and Soil, 165: 227-233.
Narayan D and Lal B. 2006. Effect of green manuring on soil properties and yield of wheat under different soil depths in alfisols under semi-arid conditions in central India. Bulletin of the National Institute of Ecology, 17:31-36.
Neilsen D. Horty PB and MacKenzie AF. 1986. Distribution of soil Zn fractions in British Columbia Interior orchard soils. Can. J. Soil Sci. 66:445-454.
Nelson DW and Sommers LE. 1982. Total carbon, OC and organic matter. In: Page AL, Miller RH and Keeney DR (eds.). Methods of soil analysis, Part 2, second Ed, Vol. 9. ASA and SSSA. Madison, WI. pp. 539-577.
Park J. Kim JY. and Kim KW. 2012. Phytoremediation of soil contaminated with heavy metals using Brassica napus. Geosyst. Eng. 15:10-18.
Puschenreiter M. Schnepf A. Millan IM. Fitz WJ. Horak O. Klepp J. Schrefl T. Lombi E and Wenzel WW. 2005. Changes of Ni biogeochemistry in the rhizosphere of the hyperaccumulator Thlaspi goesingense. Plant and Soil, 271: 205-218.
Sposito G. Levesque GS. LeClaire JP and Chang AC. 1983. Trace metal chemistry in arid-zone field soils amended with sewage sludge: Ш, Effect of time on the extraction of trace metals. SSSA. J. 47: 898-902.
Tao S. Chen YJ. Xu FL. Cao J and Li BG. 2003. Chang of copper speciation in maize rhizosphere soil. Environ. Pollut. 122:447-454.
Tejada M. Hernandez MT. Garcia C and 2006. Application of two organic amendments on soil restoration: effects on the soil biological properties. Environ. Qual. 35: 1010-1017.
Tessier A. Campbell PGC and Bisson M. 1979. Sequential extraction procedure for the speciation of particulate trace metal. Anal. Chem. 51:844-851.
Tu C. Gheng CR and Chen HM. 2000. Effect of applying chemical fertilizers on forms of lead and cadmium in red soil. Chemosphere, 41: 133-138.
Turan M and Esring A. 2007. Phytoremediation based on canola (Brassica napus L.) and Indian mustard (Brassica juncea L.) planted on spiked soil by aliquot amount of Cd, Cu, Pb, and Zn. Plant Soil Environ, 53(1):7-15.
Vaughan D. Lumsdom DG and Linehan DJ. 1993. Inﬂuence of dissolved organic matter on the bioavailability and toxicity of metals in soils and aquatic systems. Chem. Ecol. 8:185–201.
Wang ZG. Shan XQ and Zhang SZ. 2002. Comparison between fractionation and bioavailability of trace elements in rhizosphere and bulk soils. Chemosphere, 46:1163-1171.
Wei-Hong X. Huai L. Qi-Fu M and Zhi-Ting X. 2007. Root exudates, rhizosphere Zn fractions, and Zn accumulation of ryegrass at different soil Zn levels. Pedosphere, 17(3): 389-396.
Westerman REL. 1990. Soil Testing and Plant Analysis. SSSA, Madison, Wisconsin, USA.
Youssef RA and Chino M. 1987. Studies on the behavior of nutrients in the rhisosphere. Establishment of a new rhizobox system to study nutrient status in the rhizosphere. Plant Nutr. 10:1185-1195.
Zhang F. Romheld V and Marschner H. 1989. Effet of zinc deﬁciency in wheat on the release of zinc and iron mobilization rootexudates. Z. Pﬂanzenernähr. Bodenk, 152:205–210.