Nutrients Can Enhance Phytoremediation of Copper-Polluted Soil by Indian Mustard |
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Authors: | L.H. Wu H. Li Y.M. Luo P. Christie |
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Affiliation: | (1) Institute of Soil Science, Chinese Academy of Sciences, P.O. Box, 821, Nanjing, 210008, China;(2) Institute of Soil Science, Chinese Academy of Sciences, P.O. Box, 821, Nanjing, 210008, China;(3) Department of Agricultural and Environmental Science, Queen's University Belfast, Newforge Lane, Belfast BT9 5PX, UK |
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Abstract: | An orthogonally designed experiment was conducted to study the single and combined effects of N, P and K on phytoremediation of Cu-polluted soil by Indian mustard. Addition of fertilizer N and P significantly increased Indian mustard shoot yield. Two high treatments combined with N resulted in the highest yields, followed by low-P combined with N. In contrast, high P with no N gave no yield increase and K had no effect on yield of Indian mustard. Nitrogen and P increased the amount of chlorophyll in the leaves, indicating that the yield increases were due to enhanced photosynthesis. Nitrogen application had no effect on plant Cu concentrations but addition of P slightly decreased plant Cu concentrations, likely a dilution effect resulting from the increase in yield. Among the treatments, N and P applied at 100 and 200 mg kg–1 respectively with no K application resulted in the highest Cu uptake. Thus, a combination of low N and high P produced a yield increase in Indian mustard that was more than adequate to compensate for a slight decrease in Cu concentration, resulting in the highest Cu removal from the contaminated soil. |
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Keywords: | copper enhanced uptake Indian mustard nitrogen phosphorus potassium |
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