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External phosphorus requirements of five tropical grain legumes grown in flowing-solution culture

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Summary

Five tropical grain legume species were grown for periods from 4 to 20 days in flowing-solution culture at 7 maintained phosphorus (P) concentrations, ranging from 0.25 μM to 16 μM. Critical external P requirements were 0.8 μM for cowpea cv. Vita 4 and soybean cv. Fitzroy, 1.0 μM for pigeon pea cv. Royes, 2.0 μM for mungbean cv. Regur and 3.0 μM for guar cv. Brooks. Plant responses to P deficiency included reduced growth rate, increased root percentage, and increased P uptake potential. The long-term P uptake rates of guar plants were lower than those of the other species at each external P concentration. Guar plants had a low P uptake potential as indicated by short-term32CP-labelled uptake rate studies from 15 μM P solutions. Cowpea by contrast had high short-term uptake rates indicating a high P uptake potential.

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Authors and Affiliations

  1. CSIRO Division of Tropical Crops and Pastures, 4067, St. Lucia, Queensland, Australia

    F. W. Smith

  2. Department of Agriculture, University of Queensland, 4067, St. Lucia, Queensland, Australia

    A. J. Fist & D. G. Edwards

Authors
  1. A. J. Fist
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  2. F. W. Smith
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  3. D. G. Edwards
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Fist, A.J., Smith, F.W. & Edwards, D.G. External phosphorus requirements of five tropical grain legumes grown in flowing-solution culture. Plant Soil 99, 75–84 (1987). https://doi.org/10.1007/BF02370155

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