Summary
The L values of four paddy soils and one United Kingdom soil were determined under water-logged and aerobic conditions over a period of 7 weeks using rice and ryegrass as the respective test crops.
Under water-logged conditions, the L values attained a constant level in the course of the growing period, indicating that isotopic equilibrium between the added P32 and the soil was achieved.
Under aerobic conditions, the equilibrium L values tended to be lower than those determined under water-logged conditions.
This was taken as an indication of an increase of labile soil phosphorus by reduction of ferric iron.
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References
Cooke, I. J. and Hislop, J., Use of anion exchange resin for the assessment of available soil phosphate. Soil Sci.96, 308–312 (1963).
Larsen, S., Isoionic exchange of phosphate in paddy soils. Plant and Soil27, 401–407, (1967).
Nagarajah, S. and Weerasekara, D. A., Uptake and utilization of fertilizer phosphorus by rice from some rice soils of Ceylon as determined by radioactive phosphorus, P32. Trop. Agr. No. 1 (1962).
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Larsen, S. L value determination under paddy soil condition. Plant Soil 31, 282–286 (1969). https://doi.org/10.1007/BF01373571
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DOI: https://doi.org/10.1007/BF01373571