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Fig. 2. (a) Biomass of fine roots (diameter �ratios of leaf to fine root biomass of 2-year-old saplings ofpedunculate oak, which were grown on nutrient solutionsdiffering in the form and concentration of N, and harvested atthe end of three investigation peri
Table 1
Fig. 3. Amounts of ments. The broken line indicates a 1:1 relation between mea-suredagainst the amounts of NO15N, accumulated in fine roots and leavesof pedunculate oak seedlings, resulting from the uptake of15NO−3 from the nutrient solution during 3 days,
Fig. 4. Amounts of NO3shoot of 2-year-old saplings of pedunculate oak during 2 daysas calculated from the NOcomputed from the foliar NRA− translocated from the roots to the−3 concentrations of the xylem sapand from the transpiration rates, plotted against

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