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

Author(s)
MacLeod, Ivan
Blair, Graeme
MacLeod, Donald
Till, Ray
Publication Date
2023-05
Abstract
<p>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 <sup>33</sup>P and <sup>86</sup>Rb were made to trace phosphorus (P) and potassium (K) dynamics. After seven days, waterlogging in the pots were drained and an injection of <sup>32</sup>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 <sup>33</sup>P was 10 times higher in the control than in the waterlogged treatment during the 7-day waterlogging period treatment. Uptake of <sup>86</sup>Rb in the control treatment was more than twice that of the waterlogged treatment during this period. Uptake of both<sup>33</sup>P and <sup>86</sup>Rb increased during recovery but remained higher in the control treatment. Uptake of <sup>32</sup>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.</p>
Citation
Communications in Soil Science and Plant Analysis, 54(9), p. 1266-1282
ISSN
1532-2416
0010-3624
Link
Publisher
Taylor & Francis Inc
Title
Phosphorus and Potassium Ion Dynamics in a Vertisol Soil and in Cotton Plants (Gossypium hirsutum L) During a Waterlogging Event
Type of document
Journal Article
Entity Type
Publication

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