Effects of prolonged flooding on soybean at the R2 growth stage II. N and P uptake and translocation

Abstract

Abstract Knowledge of N and P uptake and translocation is essential for a greater understanding of soybean [Glycine max (L.) Merrill] nutrient relations under flooding conditions. A field experiment was conducted on a Crowley silt loam (Typic Albaqualf) to determine N and P uptake and translocation rates in soybean under flooded and non‐flooded conditions. Forrest soybean were flooded at the R? growth stage for 7 consecutive days at a flood height of 2.5 cm. The soybean were partitioned into stems, branches, leaves, and pods at 0, 7, 14, 21, 36, and 62 days after flooding. Dry matter, N and P concentrations, and total amounts of N and P accumulated for each compartment were determined at each sampling time. Calculations of whole plant uptake and translocation rates of N and P were made of the plant parts and of the nodes during the five intervals. The leaves and then the branches were the first plant parts to respond to the prolonged flooding. Leaves of the flooded plants had a greater decrease in N fluxe...