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| Effects of fertilizers and Amaranthus hypochondriacus as a catch crop on cadmium uptake of lettuce and soil cadmium content |
| Received:March 04, 2020 |
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| KeyWord:lettuce;fertilization;catch cropping;Amaranthus hypochondriacus;cadmium |
| Author Name | Affiliation | E-mail | | GU Jia-lin | Institute of Plant Nutrition and Resources, Beijing Academy of Agricultural and Forestry Sciences, Beijing 100097, China | | | SU Shi-ming | Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China | | | CHEN Yan-hua | Institute of Plant Nutrition and Resources, Beijing Academy of Agricultural and Forestry Sciences, Beijing 100097, China | | | ZHAO Tong-ke | Institute of Plant Nutrition and Resources, Beijing Academy of Agricultural and Forestry Sciences, Beijing 100097, China | | | WEI Dan | Institute of Plant Nutrition and Resources, Beijing Academy of Agricultural and Forestry Sciences, Beijing 100097, China | | | DU Lian-feng | Institute of Plant Nutrition and Resources, Beijing Academy of Agricultural and Forestry Sciences, Beijing 100097, China | | | ZOU Guo-yuan | Institute of Plant Nutrition and Resources, Beijing Academy of Agricultural and Forestry Sciences, Beijing 100097, China | gyzou@163.com |
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| Abstract: |
| This study aimed to analyze and evaluate the effect of agronomic measures on the prevention and control of cadmium(Cd) accumulation during the production of leafy vegetables. The effects of different fertilizers and Amaranthus hypochondriacus, as a catch crop, on the yield, Cd uptake of lettuce, and the soil Cd content were studied over 2 years(from March 2017 to October 2018)using a randomized block field trial in greenhouse soils with high Cd content. The lettuce yield was significantly increased when organic and inorganic fertilizers were mixed in a 1:1 ratio. The application of chemical fertilizer alone did not increase the total Cd content in soil but significantly promoted Cd absorption by plants. The risk of soil Cd accumulation during the application of high rates of organic fertilizer was effectively prevented by the use of A. hypochondriacus as a catch crop. The removal of soil Cd after 2 years of continuous planting of A. hypochondriacus ranged from 11 668.81~15 800.39 mg·hm-2. The net decrease in soil Cd for each fertilization treatment, from highest to lowest, was shown as follows:single chemical fertilizer treatment (16 219.03 mg·hm-2), fowl dung plus chemical fertilizer treatment (10 800.72 mg·hm-2), sheep manure plus chemical fertilizer treatment(8 684.25 mg·hm-2), single fowl dung treatment(6 423.05 mg·hm-2), and single sheep manure treatment(3 400.11 mg·hm-2). Considering the yield, plant Cd content, and soil Cd accumulation, the combination of fowl dung and chemical fertilizer at a 1:1 ratio and A. hypochondriacus as catch crop were recommended for lettuce cultivation. These measures ultimately reduced the Cd accumulation in soil. |
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