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

A. H. Sinclair

doi:10.1007/BF02375163

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 journal › Article › peer-review

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 K_a (the initially labile K derived from the Q/I curve), 0.92 for K₃₅ (desorbed by EUF in 35 min) and 0.97 for K_ex (1.0 M ammonium acetate extraction).

Original language	English
Pages (from-to)	85-94
Number of pages	10
Journal	Plant and Soil
Volume	64
Issue number	1
DOIs	https://doi.org/10.1007/BF02375163
Publication status	Print publication - 1 Feb 1982
Externally published	Yes

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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10.1007/BF02375163

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

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).",

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

author = "Sinclair, {A. H.}",

year = "1982",

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T1 - A comparison of electro-ultrafiltration and quantity/intensity measurements of soil potassium with its uptake by ryegrass in Scottish soils

AU - Sinclair, A. H.

PY - 1982/2/1

Y1 - 1982/2/1

N2 - 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).

AB - 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).

KW - EUF-K

KW - Exchangeable K

KW - Fluvioglacial sand

KW - Glasshouse

KW - Lower Old

KW - Perennial ryegrass

KW - Q/I-K

KW - Quartz-mica-schist

KW - Red

KW - Sandstone till

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DO - 10.1007/BF02375163

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AN - SCOPUS:0004013745

SN - 0032-079X

VL - 64

SP - 85

EP - 94

JO - Plant and Soil

JF - Plant and Soil

IS - 1

ER -

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

Abstract

Keywords

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