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Titolo:
Soil water regimes of rotationally grazed perennial and annual forages
Autore:
Twerdoff, DA; Chanasyk, DS; Naeth, MA; Baron, VS; Mapfumo, E;
Indirizzi:
Univ Alberta, Dept Renewable Resources, Edmonton, AB T6G 2H1, Canada Univ Alberta Edmonton AB Canada T6G 2H1 ces, Edmonton, AB T6G 2H1, Canada Agr & Agri Food Canada, Lacombe, AB T4L 1W1, Canada Agr & Agri Food Canada Lacombe AB Canada T4L 1W1 ombe, AB T4L 1W1, Canada
Titolo Testata:
CANADIAN JOURNAL OF SOIL SCIENCE
fascicolo: 4, volume: 79, anno: 1999,
pagine: 627 - 637
SICI:
0008-4271(199911)79:4<627:SWRORG>2.0.ZU;2-U
Fonte:
ISI
Lingua:
ENG
Soggetto:
MOISTURE; SYSTEMS; YIELD;
Keywords:
evapotranspiration; forages; grazing intensity; water-use efficiency;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
20
Recensione:
Indirizzi per estratti:
Indirizzo: Twerdoff, DA Univ Alberta, Dept Renewable Resources, Edmonton, AB T6G 2H1,Canada Univ Alberta Edmonton AB Canada T6G 2H1 , AB T6G 2H1, Canada
Citazione:
D.A. Twerdoff et al., "Soil water regimes of rotationally grazed perennial and annual forages", CAN J SOIL, 79(4), 1999, pp. 627-637

Abstract

To maintain a sustainable agricultural system, management practices such as grazing must ensure adequate soil water for plant growth, yet minimize the risk of soil erosion. The objective of this study was to characterize thesoil water regime of perennial and annual forages under three grazing intensities (heavy, medium and light). The study was conducted at the Lacombe Research Station, Alberta, on an Orthic Black Chemozem of loam to silt loam texture. The forages used were smooth bromegrass (Bromus inermis L. 'Carlton'), meadow bromegrass (Bromus ripanius L. 'Paddock'), a mixture of triticale (X Triticosecale Wittmack 'Pika') and barley (Hordeum vulgare L. 'AC Lacombe') and triticale. Soil water measurements were conducted between April and October of 1994 and 1995 using a neutron scattering hydroprobe to a depth of 90 cm. Surface (0-7.5 cm) soil water was more responsive to grazing intensity than soil water accumulated to various depths. For all grazing treatments and forages, both surface soil water and accumulated soil water generally fluctuated between field capacity and wilting point during the growing season. Although plant water status was not determined, no visual permanent wilting of forages was observed during the study. Differences in evapotranspiration (ET), as determined by differences in soil water were evident among forage species but not grazing intensities, with perennials having high ET in spring and annuals having high ET in summer. Estimated values of water-use efficiency (WUE) were greater for perennials than for annuals and grazing effects on WUE were minimal. From a management perspective, grazingof annuals and perennials altered soil water dynamics but still maintainedadequate soil water for plant growth.

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Documento generato il 28/09/20 alle ore 15:41:29