A new approach for estimating the phytotoxicity limits |
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Authors: | Anil K R Singh R K Rattan |
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Institution: | (1) Indian Agricultural Research Institute, Water Technology Centre, 110012 New Delhi, India;(2) Indian Agricultural Research Institute, Division of Soil Science and Agricultural Chemistry, 110012 New Delhi, India |
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Abstract: | A pot experiment was carried out on a Typic ustipsamment to study the effect of Cd concentration on the yield of wheat (Triticum aestivum) and soybean (Glycine max). Cd levels taken were 1, 5, 10, 20, 40, 80, and 160 g g-1 of soil. Three different statistical procedures were employed to evaluate the phytotoxicity limits. The non-linear regression technique was found to be more effective in calculating C
0 (threshold concentration) and C
100 (toxic concentration) in comparison to Cate and Nelson (1971) and Beckett and Davis (1977) procedures. This technique was unaffected by the nature of the distribution of the data and did not require any initial value of concentration as a starting point. |
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