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Titolo:
Influence of tillage and crop residue on postdispersal predation of weed seeds
Autore:
Cromar, HE; Murphy, SD; Swanton, CJ;
Indirizzi:
Univ Guelph, Dept Plant Agr, Guelph, ON N1G 2W1, Canada Univ Guelph Guelph ON Canada N1G 2W1 lant Agr, Guelph, ON N1G 2W1, Canada Univdaaterloo, Dept Environm & Resource Studies, Waterloo, ON N2L 3G1, Cana Univ Waterloo Waterloo ON Canada N2L 3G1 dies, Waterloo, ON N2L 3G1, Cana
Titolo Testata:
WEED SCIENCE
fascicolo: 2, volume: 47, anno: 1999,
pagine: 184 - 194
SICI:
0043-1745(199903/04)47:2<184:IOTACR>2.0.ZU;2-R
Fonte:
ISI
Lingua:
ENG
Soggetto:
GROUND-BEETLES COLEOPTERA; NO-TILL; COMPETITIVE ABILITY; TENEBRIONID BEETLES; SHORTGRASS PRAIRIE; PITFALL TRAPS; CORN RESPONSE; OLD-FIELDS; CARABIDAE; POPULATION;
Keywords:
integrated weed management; weed population dynamics; Carabidae; invertebrates; small mammals; ECHCG; CHEAL;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
59
Recensione:
Indirizzi per estratti:
Indirizzo: Swanton, CJ Univ Guelph, Dept Plant Agr, Guelph, ON N1G 2W1, Canada Univ Guelph Guelph ON Canada N1G 2W1 elph, ON N1G 2W1, Canada
Citazione:
H.E. Cromar et al., "Influence of tillage and crop residue on postdispersal predation of weed seeds", WEED SCI, 47(2), 1999, pp. 184-194

Abstract

Field experiments were conducted from 1995 to 1997 in southern Ontario to determine the influence of tillage and ground cover on the quantity of postdispersal seed predation of common lambsquarters and barnyardgrass, Ground-dwelling invertebrates were the dominant seed predators and were responsible for 80 to 90% of all seeds consumed. Predation was highest in no-till andmoldboard-plowed environments (averaging 32% in both) and lowest in chisel-plowed environments (averaging 24%). This indicates chat the relationship between the level of disturbance and predation is nonlinear and chat other factors, such as the mobility of invertebrates and food availability may also play important roles in determining the quantity of seed predation. In no-till, the type of crop residue also influenced the quantity of predation,with highest seed predation found in plots with corn residue (averaging 31%) and lowest in those with soybean and wheat residue (24 and 21%, respectively). It is apparent that there is an optimum combination of residue quantity and quality that maximizes the quantity of seed predation. Based on theexperimental design used in this study, no feeding preference by seed predators was detected between common lambsquarters and barnyardgrass. Density-dependent feeding, however, was evident for both species. Most biological control efforts have centered around predators with specific feeding habits. We contend that invertebrates with opportunistic feeding strategies that Feed on weed seeds may be the most significant broad spectrum and natural Form of biological weed control affecting weed population dynamics. Populations of beneficial arthropods should be conserved, and management strategies that augment the size of their natural populations should be encouraged.

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Documento generato il 24/09/20 alle ore 21:04:54