Content of trace elements (Mn, Zn, Cu, Pb, Ni and Cd) in soil and oriental tobacco after long-term inorganic fertilizer application
Radka Bozhinova, Yovko Dyulgerski
Abstract: Mn, Zn, Cu, Pb, Ni and Cd in soil and oriental tobacco (monoculture) was studied in 50-years stationary trail. Studies were conducted in 2014-2016 on rendzina soil at the Tobacco and Tobacco Products Institute - Markovo. The concentrations of total micronutrients in soil showed relatively small variation and they were not largely influenced by long-term mineral fertilization with different N, P and K rates. The accumulation of available Zn, Cu, Pb and Cd in the soil was also not significantly influenced by mineral fertilization. Available Mn and Ni were higher in fertilized treatments compared to unfertilized control. The long-term fertilization had no significant effect on Mn, Pb and Ni concentration in tobacco leaves. For lower and middle leaves, 225 kg P2O5 ha-1 treatment resulted in lowest Zn concentration. The content of copper and cadmium in the leaves tended to decrease in mineral fertilizer treatments compared to the unfertilized control. When oriental tobacco was grown on rendzina soil with good buffering capacity, the risk of Mn, Zn, Cu, Pb, Ni and Cd accumulation in tobacco leaves associated with long-term mineral fertilization is low. These experimental conditions are adequate for the production of high quality sun-cured leaves with a low level of nicotine content, higher in reducing sugars and moderate in total nitrogen.
Keywords: long-term mineral fertilization; micronutrients; soil; tobacco
Citation: Bozhinova, R., & Dyulgerski, Y. (2024). Content of trace elements (Mn, Zn, Cu, Pb, Ni and Cd) in soil and oriental tobacco after long-term inorganic fertilizer application. Bulgarian Journal of Soil Science Agrochemisty and Ecology, 58(2), 14-24 (Bg).
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| Date published: 2024-06-25
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