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Pesquisa Agropecuária Brasileira

Print version ISSN 0100-204XOn-line version ISSN 1678-3921

Abstract

MOREIRA, Adônis; MORAES, Larissa Alexandra Cardoso; NOGUEIRA, Thiago Assis Rodrigues  and  CANIZELLA, Bruna Trovo. Copper use efficiency in soybean cultivars. Pesq. agropec. bras. [online]. 2019, vol.54, e01140.  Epub Nov 25, 2019. ISSN 0100-204X.  https://doi.org/10.1590/s1678-3921.pab2019.v54.01140.

The objective of this work was to evaluate the effect of copper use efficiency in soybean cultivars, grown on a typical Ultisol with a high organic matter content, on soil chemical properties and on plant grain yield, nutritional state, and physiological components. The experiment was carried out in greenhouse conditions, in a 5×4 factorial arrangement, with five soybean cultivars (TMG 1066RR, BRS 360RR, NA 6262RR, BMX Turbo RR, and BRS 359RR) and four Cu rates (0, 2, 4, and 8 mg kg-1). Under the studied soil conditions, the DTPA-TEA and Mehlich-1 extractants were efficient in determining available Cu in the soil. Regardless of the cultivars, Cu application increased grain yield (GY), shoot dry weight yield (SDWY), number of pods per pot, GY/SDWY ratio, photosynthetic rate, stomatal conductance, internal CO2 concentration, transpiration rate, and chlorophyll content. However, Cu use efficiency varied significantly among the different soybean genotypes. Except for Cu, soil chemical attributes and foliar and grain nutrient contents are not influenced by Cu rates nor by soybean cultivars.

Keywords : Glycine max; DTPA-TEA; Mehlich 1; nutritional state; physiological components; yield components.

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