Soil waterlogging in lowland areas is detrimental to many rainfed crops in all regions of the world, affecting the growth and development of plants. Thus, this study aimed to evaluate the growth, assimilate partitioning and expression of vigor in the soybean cultivar BMX Potência when subjected to waterlogging. The treatments consisted of 2- and 4-day periods of waterlogging during the vegetative growth stage, V5. Control plants were maintained at the field capacity. At regular intervals of 14 days after sowing until the end of the cycle, plants were collected for the determination of dry mass and leaf area. We evaluated growth according to simple logistics, assimilate partitioning and the expression of seed vigor in each period. Plants in different periods of growth showed a reduced efficiency in converting solar energy over time in response to waterlogging, yielding seeds with an increased mass and vigor. Thus, it was observed that an increase in the period of waterlogging reduces plant growth but does not affect the vigor of soybean seeds.
Key words: Glycine max (L.) Merrill, dry matter, leaf area, seed vigor.
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