Abstract
ABSTRACT Previous research has implicated nitrogen (N) deficiency as a major contributor to waterlogging-induced yield loss in soybean [Glycine max. (L.) Merr.]. However, this stress is recognized as also reducing leaf concentrations of other nutrients. The objective of this research was to determine the effect of waterlogging stress on leaf N compared with other macro and micronutrients. A secondary objective was to assess the effects of waterlogging at different developmental stages on soybean yield. Compared with other nutrients [phosphorus (P), potassium (K), calcium (Ca), magnesium (Mg), sulfur (S), manganese (Mn), zinc (Zn)], N demonstrated the greatest association with waterlogging-induced yield loss. This conclusion was based on concomitant occurrence of decreased yield with decreased N, depression of N below the critical level, and symptomology. Soybean was as sensitive to waterlogging stress when applied at a vegetative stage (V4) compared with reproductive stages (R1, R3, and R5).
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