Determination of water-soluble phosphate content of soil using heterogeneous exchange reaction with 32P radioactive tracer

József Kónya, N. Nagy

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The nutrient uptake by plants is significantly influenced by the quantity of phosphate in the soil solution. Optimal fertilization rate demands the determination of water soluble phosphate quantity, the rate of desorption and phosphate exchange between the soil and soil solution at steady state. The aim of this paper was to determine the ratio of water-soluble/exchangeable to mineralized/organic phosphate after incubation of the soil with different phosphate quantities. The sorption process of phosphate on soil was studied by heterogeneous isotope exchange using a radioactive isotope of phosphorous. Using the correct mathematical analysis of the kinetics of heterogeneous isotope exchange, the rate of phosphate exchange was established under steady state condition. The distribution of radioactivity in equilibrium provided information on the reversibility or irreversibility of phosphate sorption. The results revealed that during a relatively short incubation period, the water-soluble/exchangeable phosphorous quantity, namely the portion of phosphate which can easily be taken up by plants, was proportional to the added phosphorous quantity. The tightly sorbed phosphorous quantity, however, reached a limit, suggesting that the reactants leading to tight sorption are consumed. The exchange rate of phosphorous between the soil and the solution was found to be proportional to the phosphorous quantity in the soil solution, showing that the rate-determining step of the heterogeneous isotope exchange process was the diffusion of phosphate ions.

Original languageEnglish
Pages (from-to)171-179
Number of pages9
JournalSoil and Tillage Research
Volume150
DOIs
Publication statusPublished - Jul 1 2015

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radiolabeling
phosphate
phosphates
soil
water
isotope
soil solution
sorption
isotopes
incubation
phosphate (organic)
radioactive tracer
mathematical analysis
nutrient uptake
exchange rate
radioactivity
radionuclides
desorption
kinetics
ions

Keywords

  • P radioactive tracer
  • Heterogeneous exchange rate of phosphate at steady state
  • Heterogeneous isotope exchange
  • Incubation
  • Phosphate sorption
  • Soil

ASJC Scopus subject areas

  • Agronomy and Crop Science
  • Soil Science
  • Earth-Surface Processes

Cite this

Determination of water-soluble phosphate content of soil using heterogeneous exchange reaction with 32P radioactive tracer. / Kónya, József; Nagy, N.

In: Soil and Tillage Research, Vol. 150, 01.07.2015, p. 171-179.

Research output: Contribution to journalArticle

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