Effects of spraying coffee with copper fungicides on the copper status of soils of Moshi district, Tanzania

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dc.contributor.authorMkindi, Gerard Isaac
dc.date.accessioned2026-02-17T07:50:28Z
dc.date.available2026-02-17T07:50:28Z
dc.date.issued1990
dc.descriptionDissertation
dc.description.abstractA series of investigations assess the were conducted to effects of spraying coffee with copper (Cu) fungicides on the Cu status of some soils of Moshi district, Tanzania. The studies involved analysis of soil samples taken from coffee fields sprayed with Cu fungicides for durations of 10 years, 10 30 years, >30 years and from fields which have not been sprayed. Copper from the soils was extracted using 0.005M DTPA. Then three glasshouse experiments were set the effects of different Cu levels in soils pH on up to assess and soil the growth of beans and Cu concentration in shoots. In addition, coffee from selected coffee leaves were collected the fields and analysed for Cu content. The results indicated that DTPA extractable Cu in the topsoil (0-5cm) of 5.6 ppm in farms increased from an average that had never been sprayed with copper fungicides to more gave than 30 years. 186.2 ppm in farms sprayed for shorter durations of spraying intermediate values of extractable ctable Cu Cu. decreased sharply with depth. The extra Beans grown in soils ranging in DTPA Cu contents from 3.7 to 368 PPm had a shoot of 23.2 ppm and in any no of the treatments. average Cu content in the toxicity symptoms was observed. Application of 200pg Cu/kg soil increased the average Cu content of shoots to 25.6 ppm but again the plants were free from any Cu toxicity. Coffee leaves from sprayed fields contained higher levels of copper (up toGOppm) but were also free from Cu toxicity symptoms. 5.1 However, when pH was lowered to or less, copper concentration in bean shoots increased to 35 ppm or greater and caused copper toxicity to bean plants. It was concluded that spraying coffee with copper fungicides increased the amount of copper in the soil and that the largest increase occurred in the 0-5 cm layer of soil. Not the copper accumulated in the soil was toxic to either coffee or bean plants but could become toxic if the pH of the soils decreased below 5.2.
dc.description.sponsorshipNorwegian Agency for International Development (NORAD)
dc.identifier.urihttps://www.suaire.sua.ac.tz/handle/20.500.14820/7316
dc.language.isoen
dc.publisherSokoine University of Agriculture
dc.subjectSpraying coffee
dc.subjectCopper fungicides
dc.subjectCopper status
dc.subjectSoils
dc.subjectMoshi district
dc.subjectTanzania
dc.titleEffects of spraying coffee with copper fungicides on the copper status of soils of Moshi district, Tanzania
dc.typeThesis

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