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Titolo:
Models for potassium release kinetics of four Humic Gleysols high in clay by electro-ultrafiltration
Autore:
Ziadi, N; Simard, RR; Tran, TS;
Indirizzi:
Agr & Agri Food Canada, Soils & Crops Res & Dev Ctr, St Foy, PQ G1V 2J3, Canada Agr & Agri Food Canada St Foy PQ Canada G1V 2J3 t Foy, PQ G1V 2J3, Canada Univ Laval, Fac Sci Agr & Alimentat, Ctr Rech Hort, St Foy, PQ G1K 7P4, Canada Univ Laval St Foy PQ Canada G1K 7P4 Rech Hort, St Foy, PQ G1K 7P4, Canada Inst Rech & Dev Agroenvironm, St Foy, PQ G1P 3W8, Canada Inst Rech & Dev Agroenvironm St Foy PQ Canada G1P 3W8 PQ G1P 3W8, Canada
Titolo Testata:
CANADIAN JOURNAL OF SOIL SCIENCE
fascicolo: 5, volume: 81, anno: 2001,
pagine: 603 - 611
SICI:
0008-4271(200111)81:5<603:MFPRKO>2.0.ZU;2-P
Fonte:
ISI
Lingua:
ENG
Soggetto:
NONEXCHANGEABLE POTASSIUM; QUEBEC SOILS; SODIUM TETRAPHENYLBORON; SULFUR MINERALIZATION; CALCAREOUS SOILS; ONTARIO SOILS; AVAILABILITY; EUF; ELECTROULTRAFILTRATION; MINERALOGY;
Keywords:
potassium; desorption; cumulative model; incremental model;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
44
Recensione:
Indirizzi per estratti:
Indirizzo: Simard, RR Univ Manitoba, Dept Soil Sci, 362 Ellis Bldg, Winnipeg, MB R3T 2N2, Canada Univ Manitoba 362 Ellis Bldg Winnipeg MB Canada R3T 2N2 Canada
Citazione:
N. Ziadi et al., "Models for potassium release kinetics of four Humic Gleysols high in clay by electro-ultrafiltration", CAN J SOIL, 81(5), 2001, pp. 603-611

Abstract

The rate of K release from the soil solid phase to its solution, especially from its rapidly and slowly exchangeable forms, can affect plant K uptake. The electro-ultrafiltration (EUF) technique was used to kinetically characterize the K release from four soils (Humic Gleysols) from Abitibi-Temiscaming, Quebec, Canada. Potassium was desorbed from soils that received over 166 kg K ha(-1) yr(-1) from 1994 to 1996. The desorption was carried out for 58 min (4, 4, and every 5 min thereafter for a total of 12 desorptions) at 400 V and 80 degreesC. The amount of K desorbed was between 199 and 342 mg kg(-1). Cumulative K desorption was described by the following six equations: power function, simplified Elovich, extended Elovich parabolic diffusion, zero-order, and first-order. An incremental first-order equation was also tested. The studied soils have large K supplying capacities as suggestedby forage K-uptake and total soil K desorption by EUF. In general, all tested equations adequately described the K release by EUF from the four soils. The incremental first-order equation, used for the first time, described well the soil K release data. The k rate constant from this model was significantly related to forage K uptake (R-2 = 0.58). Results from this study indicate that the investigated soils have large K reserves and that the incremental first-order equation and most of the cumulative ones are suitable for describing the kinetics of the large K release from these fine-textured Gleysols.

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Documento generato il 01/12/20 alle ore 10:37:26