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Cadmium Content of Wheat Grain from a Long-Term Field Experiment with Sewage Sludge

Amar M. Chaudri*,a, Céline M.G. Allaina, S.H. Badawya,b, Martin L. Adamsa, Steve P. McGratha and Brian J. Chambersc

a Agriculture and Environment Division, IACR-Rothamsted, Harpenden, Herts, AL5 2JQ, UK
b Soil Science Dep., Faculty of Agriculture, Cairo Univ., Giza, Egypt
c ADAS Gleadthorpe Research Centre, Meden Vale, Mansfield, Notts, NG20 9PF, UK



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  		Fig. 1. Relationship between total soil Cd and (a) soil pore water soluble Cd and (b) soil pore water free Cd2+. (c) Relationship between soil pore water soluble Cd and soil pore water free Cd2+. Treatments: {circ} no-sludge control, {square} uncontaminated control sludge, {triangleup} Zn-sludge, {triangledown} Cu-sludge, {diamond} Ni-sludge, {blacktriangleup} Cr-sludge.

 


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  		Fig. 2. Relationship between (a) total soil Cd and wheat grain Cd, (b) soil pore water soluble Cd and wheat grain Cd, and (c) soil pore water free Cd2+ and wheat grain Cd. {circ} 1994, cv. Soisson; {square} 1996, cv. Brigadier; {Delta} 1999, cv. Hereward. Equations: (a) 1994, y = 0.02 + 0.195x - 0.033x2; 1996, y = 0.025 + 0.104x - 0.013x2; 1999, y = 0.018 + 0.073x - 0.0094x2. (b) 1994, y = 0.076x + 0.071; 1996, y = 0.049x + 0.048; 1999, y = 0.035x + 0.034. (c) 1994, y = 0.0696 + 0.096x - 0.0048x2; 1996, y = 0.049 + 0.056x - 0.0017x2; 1999, y = 0.035 + 0.0395x - 0.00067x2.

 




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