Comparative study of 137Cs uptake by sunflower and spring rape depending on soil texture
Zhytomyr State Technological University
103, Chernyakhovsky St., Zhytomyr 10005, Ukraine
Department of Soil and Environment, Swedish University of Agricultural Sciences SLU, Box 7014, SE-75007, Uppsala, Sweden
In a pot experiment 137Cs TFs for spring rape were found to be 2-3 times higher than for sunflower, and for small roots (diameter < 2mm) of spring rape and sunflower were 2 and 6 times higher than that for aboveground biomass respectively. The aboveground plant biomass comprised up to 1,4% of the total 137Cs content in soil. The 137Cs output from soil to plant by aboveground spring rape biomass was 2.5 times higher than that of sunflower. By means of 137Cs TFs values, studied soils can be placed in a following decreasing order: peat > loamy sandy > loam > silty clay. Accumulation of 137Cs by aboveground biomass of plants does not depend on the level of radioactivity of the soil.
Keywords: Brassica, Helianthus, 137Cs uptake, silty and clayly fractions of soil