Alloway BJ. 1995. Heavy metals in soils. Second Edition, Springer, Chapman & Hall, London.
Bernal MP and McGrath SP. 1994. Effects of pH and heavy metal concentrations in solution culture on the proton release, growth and elemental composition of Alyssum murale and Raphanus sativus L. Plant Soil, 166:83–92.
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.
Chen Z, Setagava M, Kang Y, Sakurai K, Aikava Y and Iwasaki K. 2009. Zinc and cadmium uptake from a metalliferous soil by a mixed culture of atbyrium yokoscense and arabis flagellosa. Soil Sci and Plant Nutr. 55: 315-324.
Felix H. 1997. Field trials for in situ decontamination of heavy metal polluted soils using crops of metal-accumulating plants. Z. Pﬂanzenernahr. Bodenk. 160: 525-529.
Gee GW and Bauder JW. 1986. Particle-size analysis. In: Klute A (eds.). Methods of soil analysis, Part 1. Vol 9. ASA and SSSA. Madison, WI. pp. 383-412.
Gripsen VMJ, Nelissen HJM and Verkleij TAC. 2006. Phytoextraction with plants: A tool for sustainable management of heavy metal contaminated soils. J. Environ. Pollut. 144: 77-83.
Harter RD. 1991. Micronutrient adsorption-desorption reactions in soils. In: Mortvedt JJ et al (eds.). Micronutrients in Agriculture. 2nd ed., SSSA, Madison, WI. 59-87p.
Hseu ZY. 2006. Extractability and bioavailability of zinc over time in three tropical soils 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.
Kabata-Pendias A and Pendias H. 2000. Trace Elements in Soil and Plants. Third ed, CRC press, Bokarton, London, New York. Washington, D.C.
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 (Eds.). Methods of soil analysis, Part 3. Vol 5. ASA and SSSA. Madison, WI. 225-311p.
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 uptake and chemical changes in the rhizosphere of Thlaspi caerulescens and Thlaspi ochroleucum grown in contaminated soils. Plant Soil, 188: 153-159.
Mench M and Martin E. 1991. Mobilization of cadmium and other metals from two soils by root exudates of Zea mays L. Nicotiana tabacum L. and Nicotiana rustica L. Plant Soil, 132:187-196.
Navas A and Lindhorfer H. 2002. Geochemical speciation of heavy metals in semiarid soils of the central EbroValley (Spain). Environ. Int. 29:61-68.
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, 2nd Ed. Vol. 9. ASA and SSSA. Madison, WI. 539-577p.
Nye PH. 1981. Changes of pH across the rhizosphere induced by root. Plant Soil, 61: 7-26.
Park J, Kim JY and Kim KW. 2012. Phytoremediation of soil contaminated with heavy metals using Brassica napus. Geosyst. Eng.15 (1): 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 Soil, 271: 205-218.
Rhoades JD. 1982. Cation exchange capacity. In: Page AL, Miller RH and Keeney DR (Eds.). Methods of soil analysis, Part 2, 2nd Ed. Vol. 9. ASA and SSSA. Madison, WI. 149-157p.
Sauerbeck DR and Hein A. 1991. The nickel uptake from different soils and its predication by chemical extractants. Water, Air and Soil Pollut. 57: 861-871.
Seguin V, Gagnon C and Courchesne F. 2004. Changes in water extractable metals, pH and organic carbon concentrations at the soil-root interface of forested soils. Plant Soil, 260: 1-17.
Shan XQ and Chen B. 1993. Evaluation of sequential extraction for speciation of trace metals in model soil containing natural minerals and humic acid. Anal. Chem. 65: 802-807.
Shen ZG, Zhao FJ and McGrath SP. 1997. Uptake and transport of zinc in the hyperaccumulator Thlaspi caerulescens and the non-hyperaccumulator Thlaspi ochroleucum. Plant Cell Environ. 20: 898-906.
Stevenson FJ. 1994. Humus chemistry: Genesis, composition and reactions. John Wiley & Sons, NewYork.
Sun YB, Zhou QX, Ren LP. 2007. Growth responses of Rorippa globosa and its accumulation characteristics of Cd and As under the Cd–As combined pollution, Envir. Sci. 28: 1355-1360.
Tessier A, Campbell PGC and Bisson M. 1979. Sequential extraction procedure for the speciation of particulate trace metal. Anal. Chem. 51: 844-851.
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.
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.
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, Römheld V and Marschner H. 1989. Effet of zinc deﬁciency in wheat on the release of zinc and iron mobilization root exudates. Z. Pﬂanzenernähr. Bodenk. 152: 205–210.