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| Combined Application of Lime and Peat Reduced Cadmium Uptake by Leafy Vegetables |
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| KeyWord:lime; peat; combined application; leafy vegetables; cadmium |
| Author Name | Affiliation | | WANG Yan-hong | Key Laboratory of Plant Nutrition and Fertilizer in South Region , Ministry of Agriculture, Guangdong Key Laboratory of Nutrient Cycling and Farmland Conservation, Institute of Agricultural Resources and Environment, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China | | LI Meng-jun | Key Laboratory of Plant Nutrition and Fertilizer in South Region , Ministry of Agriculture, Guangdong Key Laboratory of Nutrient Cycling and Farmland Conservation, Institute of Agricultural Resources and Environment, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China | | TANG Ming-deng | Key Laboratory of Plant Nutrition and Fertilizer in South Region , Ministry of Agriculture, Guangdong Key Laboratory of Nutrient Cycling and Farmland Conservation, Institute of Agricultural Resources and Environment, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China | | AI Shao-ying | Key Laboratory of Plant Nutrition and Fertilizer in South Region , Ministry of Agriculture, Guangdong Key Laboratory of Nutrient Cycling and Farmland Conservation, Institute of Agricultural Resources and Environment, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China | | YU Dan-ni | Key Laboratory of Plant Nutrition and Fertilizer in South Region , Ministry of Agriculture, Guangdong Key Laboratory of Nutrient Cycling and Farmland Conservation, Institute of Agricultural Resources and Environment, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China |
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| Abstract: |
| So far there still lacks of effective means to reduce cadmium uptake by leafy vegetables from soils. A pot experiment was carried out to compare the effects of different doses of peat with lime application on shoot Cd concentrations in leafy vegetables. Changes in soil pH and DTPA-extractable cadmium contents were also determined. Compared with the control without soil amendment, lime application with different doses of peat promoted the growth of ｌｅｔｔｕｃｅ（Ｌａｃｔｕｃａ ｓａｔｉｖａ Ｌ．） ａｎｄ ｒｅｄ ｓｐｉｎａｃｈ（Ａｍａｒａｎｔｕｓ ｍａｎｇｅｓｔｎｕｓ Ｌ．） ｆｏｒ ｔｈｅ ｓｅｃｏｎｄ ａｎｄ ｔｈｅ third cropping, increased soil pH by 0.76~1.14 units, and reduced the concentrations of available Cd in soils by 7.55%~32.0% and the shoot Cd concentrations in leafy vegetables by 35.5%~67.2%. Combined application of lime with peat enhanced soil pH by 0.04~0.32 units, and decreased soil DTPA extractable Cd by 2.06%~20.6% after the second crop, and shoot Cd concentrations in leafy vegetables by 11.1%~24.6% for the first two crops, as compared with lime alone. In summary, lime and peat exhibits synergistic effect, with the most effects at the ratio of 1∶5（ｌｉｍｅ∶ｐｅａｔ）. Such effects of the treatment could last up to the third cropping. Therefore, applying lime and peat at a proper ratio is an effective measure to reduce shoot Cd contents in leaf vegetables in moderately contaminated soils. |
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