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Sunflower micronutrient uptake curves

DOI: 10.1590/S1413-70542011000200016

Keywords: helianthus annuus, nutrient uptake rate, micronutrients, mineral nutrition.

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Abstract:

most studies in the literature regarding the uptake of micronutrients [zinc (zn), manganese (mn), iron (fe), copper (cu) and boron (b) accumulation] by sunflower are old. for this reason, this work is aimed to establish curves of sunflower micronutrient accumulation in tropical edaphoclimatic conditions. the experiment was conducted in field on rhodic eutrudox, located at the experimental farm of embrapa soja in londrina-pr, using the commercial hybrid brs 191. the experimental design was completely randomized, with four replicates. the experimental units consisted of 14 lines with a spacing of 0.70 meter between lines and 25.0 meters in length, with final density of 42,858 plants per hectare. plants samples were collected every 14 days after emergence. after each collection, plants were divided into petiole, leaf, stem, capitulum and achenes. they were dried until reaching constant weight. then, dry matter was weighed and the concentrations of zn, mn, fe, cu, and b were determined in the vegetal tissue. micronutrient uptake occurred faster in the phase initiated 42 days after emergence (dae). iron was the most absorbed micronutrient, accumulating higher amounts in the achenes as well as in relation to the total absorbed. fe, mn, zn, b and cu concentrations were 38.06, 19.68, 9.20, 8,62 and 4.27 mg plant-1, respectively.

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