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Titolo:
Soil-available phosphorus as evaluated by desorption techniques and chemical extractions
Autore:
Ziadi, N; Simard, RR; Tran, TS; Allard, G;
Indirizzi:
Univ Laval, Fac Sci Agr & Alimentat, Dept Phytol, St Foy, PQ G1K 7P4, Canada Univ Laval St Foy PQ Canada G1K 7P4 pt Phytol, St Foy, PQ G1K 7P4, Canada 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 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: 2, volume: 81, anno: 2001,
pagine: 167 - 174
SICI:
0008-4271(200105)81:2<167:SPAEBD>2.0.ZU;2-N
Fonte:
ISI
Lingua:
ENG
Soggetto:
ANION-EXCHANGE MEMBRANES; ELECTROULTRAFILTRATION TECHNIQUE; EXTRACTABLE PHOSPHORUS; EUF; KINETICS; INDEXES; RELEASE; QUEBEC;
Keywords:
anion exchange membranes; grass-P uptake; P-desorption; mehlich3-P; olsen-P;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
38
Recensione:
Indirizzi per estratti:
Indirizzo: Simard, RR Agr & Agri Food Canada, Soils & Crops Res & Dev Ctr, 2560 Hochelaga Blvd, St Foy, PQ G1V 2J3, Canada Agr & Agri Food Canada 2560 HochelagaBlvd St Foy PQ Canada G1V 2J3
Citazione:
N. Ziadi et al., "Soil-available phosphorus as evaluated by desorption techniques and chemical extractions", CAN J SOIL, 81(2), 2001, pp. 167-174

Abstract

The P-supplying power of the fine-textured soils from Abitibi-Temiscaming (Quebec, Canada) has never been investigated. Anion exchange membranes (AEM), the electro-ultrafiltration (EUF) technique and chemical extractions were used to describe their P status. Phosphorus was desorbed from four soils that had received 52.4 kg P ha(-1) yr(-1) from 1994 to 1996 and from unfertilized soils. The cumulative amount of P desorbed in 75 min by EUF from unfertilized soils varied from 10 to 69 mg P kg(-1). Averaged over all sites and treatments, the amount of soil P extracted by different methods ranged from 1.0 to 18.9 mg P kg(-1). The cumulative grass P uptake was significantly related to P desorbed by all methods (0.39 < r < 0.84). A close relationship between grass P uptake and P-AEMs indicated the adequacy of the AEMs todetermine plant-available P in Abitibi-Temiscaming soils. A high degree oflinearity (0.97 < R-2 < 0.99) Of the EUF-P desorption curves at 200 V and 20 degreesC with time was obtained. This indicates that soils have a high capacity to buffer removal of P from soil solution with reserve P. The EUF technique has shown that these soils hold very large inorganic P reserves and this may explain the lack of grass response to P fertilizers.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/12/20 alle ore 16:36:20