Tolerance of Cultivated Plants Towards Cadmium and Utilization of Cd-Polluted Soils in Agriculture
Author(s): WANG Kairong, GONG Huiqun, WANG Jiurong
Pages: 196-199
Year: 2000 Issue: 4
Journal: Agro-Environmental Protection
Keyword: cadmium; cultivated plants; Cd-resistance; utilization of Cd-polluted farmland soil;
Abstract: A comparative evaluation of tolerance of several main cultivated plants towards cadmium in south China was conducted for making strategy of agro-ecological regulation and safe-and-efficient utilization in farmland polluted by Cd. It revealed that cereals such as Oryza sativa and Zea mays had a strong resistance to Cd toxicity physiologically, whereas, their kernels (grains) were easily to be polluted and hence lost their eatable value. On the other hand, other plants such as Brassica napus, Arachis hypogaea and Saccharum officinarum etc. also had a strong resistance to Cd pollution physiologically. Meanwhile, Cd stocks in their products (oil or sugar) are very small and had little effects on their eatable quality,making it possible to cultivate these crops in some slightly Cd polluted farmlands. But the straw and dregs of oil crops, and sugarcane bagasse should be properly treated as pollutants, as they were suitable neither as manure nor stock food. Fibre crops, such as Gossypium hirsutum, Hibiscus cannabinus, Boehmeria nivea and Morus alba were resistant to soil Cd-pollution at different degrees. There were basically no unfavorable effects of soil Cd pollution on the products of fibre crops. Moreover, there was hardly any Cd coming into the food chain through these crops. Therefore, in considering of the strategy of agro-ecological regulation and safe-and-efficient utilization of Cd-polluted farmlands, these fibre crops should firstly replace those sensitive crops in the polluted region.
Pages: 196-199
Year: 2000 Issue: 4
Journal: Agro-Environmental Protection
Keyword: cadmium; cultivated plants; Cd-resistance; utilization of Cd-polluted farmland soil;
Abstract: A comparative evaluation of tolerance of several main cultivated plants towards cadmium in south China was conducted for making strategy of agro-ecological regulation and safe-and-efficient utilization in farmland polluted by Cd. It revealed that cereals such as Oryza sativa and Zea mays had a strong resistance to Cd toxicity physiologically, whereas, their kernels (grains) were easily to be polluted and hence lost their eatable value. On the other hand, other plants such as Brassica napus, Arachis hypogaea and Saccharum officinarum etc. also had a strong resistance to Cd pollution physiologically. Meanwhile, Cd stocks in their products (oil or sugar) are very small and had little effects on their eatable quality,making it possible to cultivate these crops in some slightly Cd polluted farmlands. But the straw and dregs of oil crops, and sugarcane bagasse should be properly treated as pollutants, as they were suitable neither as manure nor stock food. Fibre crops, such as Gossypium hirsutum, Hibiscus cannabinus, Boehmeria nivea and Morus alba were resistant to soil Cd-pollution at different degrees. There were basically no unfavorable effects of soil Cd pollution on the products of fibre crops. Moreover, there was hardly any Cd coming into the food chain through these crops. Therefore, in considering of the strategy of agro-ecological regulation and safe-and-efficient utilization of Cd-polluted farmlands, these fibre crops should firstly replace those sensitive crops in the polluted region.
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