Abstract
In this paper, hyperaccumulator straw (Solanum nigrum L., Amaranthus chinense L., and Siegesbeckia orientalis L.) and phosphate rock powder were selected as materials, a pot experiment was used to study the effects of three compounding modifiers on the growth, nutritional quality and cadmium (Cd) content of Chinese cabbage. The results showed that: (1) The combination of Siegesbeckia orientalis + phosphate rock powder can significantly promote the growth of Chinese cabbage, while Solanum nigrum + phosphate rock powder and Amaranthus chinense + phosphate rock powder have no effect on the growth of Chinese cabbage. (2) The combination of Solanum nigrum and phosphate rock powder increased the content of soluble sugar, soluble protein and VC in shoots of Chinese cabbage by 64.33%, 16.27% and 2.2%, respectively, and the nitrite content decreased by 34.58%, which improved the quality of Chinese cabbage. (3) Different compounding modifiers can significantly reduce the Cd content in shoots of Chinese cabbage, and the reduction of Solanum nigrum + phosphate rock powder is the largest, reaching 61.29%. In conclusion, all three modifiers can improve the nutritional quality and reduce the Cd content in the shoots of Chinese cabbage, and Solanum nigrum + phosphate rock powder has the best effect.
Highlights
At present, the area of cultivated land polluted by heavy metal cadmium (Cd) in China is about 1.3×104 hectare, involving 25 regions in 11 provinces and municipalities
(2) The combination of Solanum nigrum and phosphate rock powder increased the content of soluble sugar, soluble protein and VC in shoots of Chinese cabbage by 64.33%, 16.27% and 2.2%, respectively, and the nitrite content decreased by 34.58%, which improved the quality of Chinese cabbage
The area of cultivated land polluted by heavy metal cadmium (Cd) in China is about 1.3×104 hectare, involving 25 regions in 11 provinces and municipalities
Summary
The area of cultivated land polluted by heavy metal cadmium (Cd) in China is about 1.3×104 hectare, involving 25 regions in 11 provinces and municipalities. It is important to find suitable methods to remediate Cd contaminated soil and reduce Cd content in crops. In-situ passivation remediation technology has become a research hotspot for the treatment of heavy metal contaminated soil due to its rich resources, low cost and easy operation. The passivation remediation effects of different materials vary significantly with soil properties, types and degrees of heavy metal contamination, types and dosages of materials [4]. Pot experiments were conducted to study the effects of phosphate rock powder and hyperaccumulated plant straw on the quality and Cd content of Chinese cabbage grown on Cd-contaminated soils, using Solanum nigrum L., Amaranthus chinense L., and Siegesbeckia orientalis L. as test materials and Chinese cabbage as indicator plant, in order to restore Cd-contaminated soils in situ passivation. To provide theoretical reference for the safe production of vegetables
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