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| Effect of black-net or black-film coverage on plant growth and Cd and Zn contents in Sedum alfredii and corn rotation |
| Received:January 24, 2018 |
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| KeyWord:black-net coverage;weed control;plant yields;runoff of nutrient elements |
| Author Name | Affiliation | E-mail | | LIU Peng | Key Laboratory of Soil Environment and Waste Reuse in Agriculture of Guangdong High Education Institutes, College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China | | | HUANG Xiao-yu | Key Laboratory of Soil Environment and Waste Reuse in Agriculture of Guangdong High Education Institutes, College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China | | | YANG Da-li | Key Laboratory of Soil Environment and Waste Reuse in Agriculture of Guangdong High Education Institutes, College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China | | | TANG Ying | Key Laboratory of Soil Environment and Waste Reuse in Agriculture of Guangdong High Education Institutes, College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China | | | LIN Yun-shen | Key Laboratory of Soil Environment and Waste Reuse in Agriculture of Guangdong High Education Institutes, College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China | | | JIANG Cheng-ai | Key Laboratory of Soil Environment and Waste Reuse in Agriculture of Guangdong High Education Institutes, College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China | | | WU Qi-tang | Key Laboratory of Soil Environment and Waste Reuse in Agriculture of Guangdong High Education Institutes, College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China | wuqitang@scau.edu.cn |
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| Abstract: |
| The effects of black-net coverage, black-film coverage, and control(CK), i.e., without coverage, on weed control were studied in order to reduce the labor cost. Weed control rate, crop yield, and Cd and Zn contents of crops were measured. Field experiments were conducted with Cd-contaminated soil. Results showed that, for Sedum alfredii Hance plantings in field plots, the rates of weed control by blacknet coverage were 93.08%, 93.12%, and 77.99% for three harvest times of weeds after cropping, whereas those by black-film coverage were 100%, 98.39%, and 87.39%, meaning both methods controlled the weeds well. In the second experiment, with low-Cd corn plantings, the results obtained were rather similar. Compared to CK, black-net coverage increased the yield of S. alfredii, Cd content in plants, and total Cd phytoextraction. The nutrient(nitrogen, phosphorus, and potassium) concentrations in runoff water following additional chemical fertilization after the corn flowering with the treatment of black-net coverage were lower than those of black-film coverage and similar to those of CK. Hence, black-net coverage could not only effectively control weeds, but also had advantages of permeating the rainwater through the nets and no need for opening the nets during chemical fertilization. This method is particularly suitable for application in phytoremediation of Cd-contaminated soils. |
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