Measurement of the maximum amount of water-extractable phosphorus in animal manure compost by continuous and sequential water extraction

Teppei Komiyama, Toyoaki Ito, Masahiko Saigusa

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

Measuring the phosphorus (P) solubility in animal manure compost (AMC) is important to estimate both the risk of P loss from agricultural land and the P availability for crops in agriculture that use AMC as fertilizer. Water-extractable phosphorus (WEP) has most often been used to estimate P solubility in AMC. A single water extraction with a high ratio of compost to water is usually used to determine WEP, but in many cases, this may not evaluate the maximum WEP. In this study, we extracted the P included in AMC by using a continuous extraction method with a large amount of water, and tested this approach for 16 AMCs: four cattle manure composts, five swine manure composts, five layer (chicken) manure composts, and two broiler (chicken) litter composts. The P dissolution patterns were fitted to kinetic models, and the maximum WEP (WEPmax) was determined by the coefficient of the non-linear regression equation. The WEPmax values corresponded to the sum of H2O- and sodium bicarbonate (NaHCO3)-extractable P measured using the modified Hedley sequential extraction method. The result also suggests that the maximum amount of WEP from AMC can be estimated rapidly using a sequential extraction (the Hedley method) that has been widely used to characterize P in manure or AMC. The maximum water-extractable magnesium (Mg) (WEMgmax) was significantly positively correlated with WEPmax (r = 0.854, P < 0.01). This suggests that WEPmax in the AMCs is affected by water-soluble magnesium compounds.

Original languageEnglish
Pages (from-to)196-207
Number of pages12
JournalSoil Science and Plant Nutrition
Volume60
Issue number2
DOIs
Publication statusPublished - 2014 Mar

Keywords

  • Animal manure compost
  • continuous water extraction
  • nutrient availability
  • phosphorus fractionation
  • water-extractable phosphorus

ASJC Scopus subject areas

  • Soil Science
  • Plant Science

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