Abstract
Concentrations of N, P and K were measured in floodwater and in floating rice cultivars growing at up to 2m water depths in the central flood plain of Thailand. Concentrations of N, P and K in floodwater were often higher than those reported for oligotrophic lakes, nevertheless the floodwater contained 4–45 times less K and 15–90 times less N than concentrations reported in most soil solutions. P concentrations were similar in the floodwater and in most soil solutions.
Concentrations of nutrients in leaves indicated there may be deficiencies of P at two sites and a deficiency of N at one of two sites. Data are discussed in terms of reduced nutrient uptake in rice fields at low O2 concentrations which have recently been measured in these areas.
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Setter, T.L., Kupkanchanakul, T., Pakinnaka, L. et al. Mineral nutrients in floodwater and floating rice growing at water depths up to two metres. Plant Soil 104, 147–150 (1987). https://doi.org/10.1007/BF02370637
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DOI: https://doi.org/10.1007/BF02370637