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Titolo:
Changes in phosphorus fractions of a Humic Gleysol as influenced by cropping systems and nutrient sources
Autore:
Zheng, ZM; Simard, RR; Lafond, J; Parent, LE;
Indirizzi:
Agr & Agri Food Canada, Res 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, Dept Soil & Agri Food Engn, St Foy, PQ G1K 7P4, Canada Univ Laval St Foy PQ Canada G1K 7P4 Food Engn, St Foy, PQ G1K 7P4, Canada Agr & Agri Food Canada, Res Farm, Normandin, PQ G8M 4K3, Canada Agr & AgriFood Canada Normandin PQ Canada G8M 4K3 in, PQ G8M 4K3, Canada
Titolo Testata:
CANADIAN JOURNAL OF SOIL SCIENCE
fascicolo: 2, volume: 81, anno: 2001,
pagine: 175 - 183
SICI:
0008-4271(200105)81:2<175:CIPFOA>2.0.ZU;2-0
Fonte:
ISI
Lingua:
ENG
Soggetto:
ORGANIC SOIL-PHOSPHORUS; MANURE APPLICATION; TILLAGE SYSTEMS; ROTATION; CULTIVATION; DYNAMICS; WHEAT; FORMS; CORN; TRANSFORMATIONS;
Keywords:
P fractions; crop rotations; liquid dairy manure; chisel plowing; moldboard plowing;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
48
Recensione:
Indirizzi per estratti:
Indirizzo: Simard, RR Agr & Agri Food Canada, Res Ctr, St Foy, PQ G1V 2J3, Canada Agr& Agri Food Canada St Foy PQ Canada G1V 2J3 1V 2J3, Canada
Citazione:
Z.M. Zheng et al., "Changes in phosphorus fractions of a Humic Gleysol as influenced by cropping systems and nutrient sources", CAN J SOIL, 81(2), 2001, pp. 175-183

Abstract

Information about the dynamics of soil P fractions is useful to predict their bioavailability and risk of P transfer from soils to surface waters. The objective of this study was to assess the effects of cropping systems andnutrient sources on P fractions in a Labarre silty clay (Humic Gleysol). Soil samples (0-15 cm) were collected in 1989, 1994 and 1997 from a field with four cropping systems, combining two crop rotations, barley (Hordeum vulgare L.) monoculture and 3-yr barley-forage rotation, with two tillage operations (chisel and moldboard plowing) as main plots, and two nutrient sources (mineral fertilizer and liquid dairy manure) as subplots. A modified Hedley sequential fractionation scheme was used. The inorganic P (P-i) fractions (resin-P, NaHCO3-P-i, and NaOH-P-i) increase with time in all cropping system and nutrient source combinations. Organic (P-o) fraction (NaHCO3-P-o and NaOH-P-o) changes were related to C inputs and total soil C contents. The barley monoculture combined with mineral fertilizer slightly reduced NaHCO3-P-o and NaOH-P-o. The barley-forage rotation increased labile P-o fractions. Rotation, chisel plowing and liquid dairy manure addition result in abuildup of labile P. A larger labile P increment per unit of P added, in surplus to plant exports, was observed with dairy manure than for mineral fertilizer, suggesting a higher risk of surface water contamination by P. Cropping systems and nutrient sources have a large influence on the changes inP fractions in this fine-textured Gleysolic soil.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/11/20 alle ore 00:52:30