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Soybeans flooded for extended periods of time generally appear nitrogen deficient. The taproot may be killed and extensive callus develops on the surface of the upper taproot. New adventitious roots develop as the flood waters subside, and plants may eventually appear normal but stunted. Phytophthora root rot in susceptible varieties is frequently associated with flooding damage. Herbicide injury often is more severe in flooded spots. Extended flooding during very early vegetative stages (V1-V2) and the early reproductive stages (R1-R3) is more likely to reduce yields than at other growth stages. |