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The direct effect of addition of a pulse of 500 μM P on Mn net uptake in 44-day-old plants of the Mn-efficient genotype Vanessa as measured by on-line ICP-MS. The experiment was repeated several times with similar results. The shoot and root weight was 4.78 and 1.7 g DW, for the plant receiving only the Mn pulse (circles) and 4.84 and 1.8 g DW for the plant receiving an additional P pulse (triangles). The curves were normalized to equal root weight for both plants.
