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The aim is to examine the nutrient ion dynamics in a Vertisol soil undergoing waterlogging to ascertain whether soil solution concentration and/or nutrient uptake dynamics are the cause of boll shedding in cotton. Cotton was grown in pots, and the soil waterlogged after 76 days at which time injections of  33 P and  86 Rb were made to trace phosphorus (P) and potassium (K) dynamics. After seven days, waterlogging in the pots were drained and an injection of  32 P was made to trace P dynamics during the recovery period. Redox fell rapidly during waterlogging, and soil solution concentrations of P, K, sodium (Na), and manganese (Mn) increased. Biomass accumulation was less in the waterlogged treatment than in the non-waterlogged control. In the 7-day recovery period, shoot biomass increased in the waterlogged treatment and root biomass weight continued to decline. Recovery of  33 P was 10 times higher in the control than in the waterlogged treatment during the 7-day waterlogging period treatment. Uptake of  86 Rb in the control treatment was more than twice that of the waterlogged treatment during this period. Uptake of both 33 P and  86 Rb increased during recovery but remained higher in the control treatment. Uptake of  32 P occurred during post-waterlogging but remained higher in the control treatment. Reduced uptake of P and K during waterlogging is most likely due to damage to the uptake mechanisms of the roots rather than a reduction in the concentration of nutrients in the soil solution under waterlogged conditions.

Phosphorus and Potassium Ion Dynamics in a Vertisol Soil and in Cotton Plants ( Gossypium hirsutum L) During a Waterlogging Event