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. 1994, cv. Soisson; 1996, cv. Brigadier; 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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