CORRELATION BETWEEN SOIL CHARACTERISTICS AND IRON CONTENT IN ABOVEGROUND BIOMASS OF VIRGINIA TOBACCO
Keywords:
Fe, uptake, Virginia tobacco,, correlation, soilsAbstract
The study was conducted on alluvial-meadow, maroon-forest soils and vertisols with Virginia tobacco. The total content of
iron was measured through decomposition by HF, HClO and HNO acids. A solution of 0.005 M diethylentriaminepentaacetic
acid + 0.1 M triethanolamine, pH 7.3 was used for extraction of the elements’ mobile forms from soils. The plant sample
preparation was made by means of dry ashing and dissolution in 3 M HCl. A Varian Spectra AA 220 Atomic Absorption
Spectrophotometer was used for Fe content determination in soil and plant samples. Certified reference materials (three types
of soils and tobacco leaves) were also analyzed for accurate determination of Fe concentrations. A correlation and regression
analysis was conducted between pH, humus content, total and mobile iron forms in the soil, and the concentration of these
elements in aboveground biomass of Virginia tobacco. It was estimated that there were statistically significant relationships
between soil pH and iron concentration in Virginia tobacco plant organs. The correlation - regression analysis results showed
that there were no statistically significant relationships between humus and iron concentration in aboveground tobacco biomass
of Virginia tobacco. Also, the results of the correlation - regression analysis showed that there were no statistically significant
relationships between the total element content in soils and iron content in aboveground tobacco biomass of Virginia type.
Regression relationships were established between movable iron in the soil and element content in leaves from the lower,
middle and upper harvesting zones.
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