Measurement of total phosphorus and organic phosphorus contents of animal manure composts by the dry combustion method

Tsuyoshi Yokota, Toyoaki Ito, Masahiko Saigusa

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

The objective of this paper was to determine the optimum ignition temperature to measure precisely the total and organic P contents of animal manure composts by the dry combustion method. Total P content of the composts was measured by the wet digestion method and the dry combustion method, while the organic P content was measured by the fractionation method and the dry combustion method. Total P content of the composts ranged from 4.43 to 48.6 g kg−1 and there were significant correlations between the total P content measured by the wet digestion method and that measured by the dry combustion method at 550°C. Organic P content measured by the fractionation method ranged from 0.44 to 8.62 g kg−1. Organic P content measured by the dry combustion method ranged from 0.10 to 8.63 g kg−1, and there were significant correlations (r = 0.951) between the data obtained by the fractionation method and those obtained by the dry combustion method at 550°C. Ignition at 240 and 350°C was insufficient to completely decompose the organic matter, and resulted in the underestimation of the total and organic P contents of the composts. The proportion of organic P in all the compost samples ranged from 0.54 to 46%. Based on these results, we concluded that 550°C was the optimum ignition temperature for a precise determination of the total and organic P contents of animal manure composts by the dry combustion method.

Original languageEnglish
Pages (from-to)267-272
Number of pages6
JournalSoil Science and Plant Nutrition
Volume49
Issue number2
DOIs
Publication statusPublished - 2003 Apr 1

Keywords

  • Animal manure compost
  • Inorganic phosphate
  • Organic phosphate

ASJC Scopus subject areas

  • Soil Science
  • Plant Science

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