A comparison of electro-ultrafiltration and quantity/intensity measurements of soil potassium with its uptake by ryegrass in Scottish soils

A. H. Sinclair*

*Corresponding author for this work

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Electro-ultrafiltration (EUF) and quantity/intensity (Q/I) parameters of soil K were compared for 14 soils from each of three soil series. The K desorbed by EUF during the first 10 min (K10) was closely correlated with the equilibrium activity ratio (AR0) for soils of the same series, but differences between series reflected the soil K-buffering capacity, indicating that K10 includes loosely held exchangeable K and is not strictly an intensity measurement. EUF values were compared with conventional soil test methods for predicting K-uptake and dry-matter yield of ryegrass grown in the glasshouse. Correlation coefficients between K uptake at the first cut were 0.80 for K10, 0.88 for Ka (the initially labile K derived from the Q/I curve), 0.92 for K35 (desorbed by EUF in 35 min) and 0.97 for Kex (1.0 M ammonium acetate extraction).

Original languageEnglish
Pages (from-to)85-94
Number of pages10
JournalPlant and Soil
Volume64
Issue number1
DOIs
Publication statusPrint publication - 1 Feb 1982
Externally publishedYes

Keywords

  • EUF-K
  • Exchangeable K
  • Fluvioglacial sand
  • Glasshouse
  • Lower Old
  • Perennial ryegrass
  • Q/I-K
  • Quartz-mica-schist
  • Red
  • Sandstone till

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