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Titolo:
An agri-environmental phosphorus saturation index for acid coarse-texturedsoils
Autore:
Khiari, L; Parent, LE; Pellerin, A; Alimi, ARA; Tremblay, C; Simard, RR; Fortin, J;
Indirizzi:
Univ Laval, Ctr Rech Geomat, St Foy, PQ G1K 7P4, Canada Univ Laval St FoyPQ Canada G1K 7P4 ch Geomat, St Foy, PQ G1K 7P4, Canada Univ Laval, Dept Sols & Genie Agroalimentaire, St Foy, PQ G1K 7P4, Canada Univ Laval St Foy PQ Canada G1K 7P4 imentaire, St Foy, PQ G1K 7P4, Canada Agr & Agri Food Canada, Ctr Rech & Dev Sols & Grandes Cultures, St Foy, PQG1V 2J3, Canada Agr & Agri Food Canada St Foy PQ Canada G1V 2J3 St Foy, PQG1V 2J3, Canada
Titolo Testata:
JOURNAL OF ENVIRONMENTAL QUALITY
fascicolo: 5, volume: 29, anno: 2000,
pagine: 1561 - 1567
SICI:
0047-2425(200009/10)29:5<1561:AAPSIF>2.0.ZU;2-#
Fonte:
ISI
Lingua:
ENG
Soggetto:
PHOSPHATE SORPTION; RUNOFF;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
37
Recensione:
Indirizzi per estratti:
Indirizzo: Parent, LE Univ Laval, Ctr Rech Geomat, Paul COmtois Bldg, St Foy, PQ G1K 7P4, Canada Univ Laval Paul COmtois Bldg St Foy PQ Canada G1K 7P4 4, Canada
Citazione:
L. Khiari et al., "An agri-environmental phosphorus saturation index for acid coarse-texturedsoils", J ENVIR Q, 29(5), 2000, pp. 1561-1567

Abstract

Potato (Solanum tuberosum L.) is a high P demanding crop contributing to Psaturation of acid coarse-textured soils. The P status is commonly assessed agonomically by soil testing of P (STP) and environmentally by soil P saturation or P solubility indexes. The aim of this work was to develop a P fertilizer recommendation model integrating P environmental risk and crop response probability, using P and Al extracted by the Mehlich-III soil testingmethod (mg P or Al L-1 of soil) and expressed as (P/Al)(M-III) percentage. The environmentally critical (P/Al)(M-III) percentage was 15%, corresponding to the critical degree of phosphate saturation (DPS) value of 25% (oxalate extraction procedure) proposed in the Netherlands. Using the Cate-Nelsonprocedure, the critical (P/Al)(M-III) percentage across 78 field experiments was 8.2% as determined by inductively coupled-argon plasma (ICP). Probability of potato response to P was close to 100% even above the critical STPvalues as shown by power tests on relative yields. The P recommendation model was computed from conditional expectations of 50 and 80% within each fertility group below 15% as (P/Al)(M-III) Above 15%, the model recommended 21 kg P ha(-1), the amount of P exported by a tuber harvest of approximately42 Mg ha(-1) Using conversion equations with 114 soil samples for STP methods, fertility groups built for Quebec acid coarse-textured soils were found to be comparable with those currently used in the Netherlands and Lower Saxony (Germany). The (P/Al)(M-III) percentage provided a reliable and unifying criterion for making environmentally acceptable and agronomically efficient P recommendations for sustainable potato production.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 05/12/20 alle ore 19:31:41