Copper contamination of soil and vegetation in coffee orchards after long-term use of Cu fungicides

作者: J.Ø. Loland , B.R. Singh

DOI: 10.1023/B:FRES.0000035175.74199.9A

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摘要: The repeated use of Cu fungicides to control coffee berry disease can result in increased content soils and vegetation thus raising the pollution levels a concern for potential effects on human health. Therefore field survey orchards Kilimanjaro Arusha regions Tanzania, where are frequently used, was conducted determine possible contamination vegetation. Soil samples were collected from 0–5, 5–15 15–30 cm depth at distance 0.5 m trunk trees. Plant leaf beans maize crops intercropped with trees as well leaves trees, also same time places. plant both small farms commercial estates. Copper soil extracted CaCl2 (CCu), whereas total Cu, digested aqua regia (HNO3 HCl(1:3) (ACu)). drying ashed HNO3. concentration solutions determined atomic absorption spectrophotometry. A significant enrichment observed 0–5 about three times higher than depth. large variability between fields farm within orchard observed. differences (ACu) estates not statistically significant, but extractable (CCu) pH lower region farms. organic carbon (SOC) significantly increasing altitudes, it SOC showed close positive correlation Cu. At below 5.3, CCu fraction steeply. Bean plants high suggesting toxicity problem bean plants. Coffee extremely concentration.

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