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Titolo:
WEED SPECIES-DIVERSITY IN SPRING BARLEY VARIES WITH CROP-ROTATION ANDTILLAGE, BUT NOT WITH NUTRIENT SOURCE
Autore:
STEVENSON FC; LEGERE A; SIMARD RR; ANGERS DA; PAGEAU D; LAFOND J;
Indirizzi:
AGR CANADA,RES CTR,107 SCI CRESCENT SASKATOON SK S7N 0X2 CANADA AGR CANADA,RES CTR SASKATOON SK S7N 0X2 CANADA UNIV SASKATCHEWAN,DEPT SOIL SCI SASKATOON SK S7N 5A8 CANADA AGR CANADA,RES CTR ST FOY PQ G1V 2J3 CANADA AGR CANADA,RES CTR NORMANDIN PQ G8M 4K3 CANADA
Titolo Testata:
Weed science
fascicolo: 6, volume: 45, anno: 1997,
pagine: 798 - 806
SICI:
0043-1745(1997)45:6<798:WSISBV>2.0.ZU;2-O
Fonte:
ISI
Lingua:
ENG
Soggetto:
SYSTEMS; POPULATIONS; COMMUNITIES; HERBICIDES; MANAGEMENT; DYNAMICS; IMPACT;
Keywords:
COMMON CHICKWEED, STELLARIA MEDIA (L.) VILL.; RED CLOVER, TRIFOLIUM PRATENSE L. PROSPER; SPRING BARLEY HORDEUM VULGARE L. CHAPAIS; TIMOTHY, PHLEUM PRATENSE L. CHAMP; WEED SPECIES DIVERSITY; CROP MANAGEMENT PRACTICES; SPECIES RICHNESS; SPECIES EVENNESS; SHANNONS H; SHANNONS E; MARGALEFS D-MG; STEME; TRFPR; HORVX; PHLPR;
Tipo documento:
Article
Natura:
Periodico
Citazioni:
30
Recensione:
Indirizzi per estratti:
Citazione:
F.C. Stevenson et al., "WEED SPECIES-DIVERSITY IN SPRING BARLEY VARIES WITH CROP-ROTATION ANDTILLAGE, BUT NOT WITH NUTRIENT SOURCE", Weed science, 45(6), 1997, pp. 798-806

Abstract

The development of sustainable farming systems depends on our abilityto predict and manage the response of weed communities to changes in cropping practices. A study was established at Normandin, Quebec, Canada, to investigate the influence of liquid dairy manure and mineral fertilizer, as well as chisel and moldboard plow tillage systems, in a spring barley monoculture and a 3-yr spring barley-forage rotation thatincluded red clover and timothy. Weed species richness (Margalef's D-MG), evenness (Shannon's E), and diversity (Shannon's H') were examined in these treatments from 1992 to 1995. Nutrient source had no effecton any of the three diversity indices. Evenness values were extremelylow in all years, suggesting dominance of a few weed species in most treatments. Weed species richness and diversity generally were greaterin the barley-forage rotation compared with the monoculture. Tillage effects on richness and diversity varied with crop rotation. Margalef's D-MG and Shannon's H' were greater in 1993 and 1995, but they were lower in 1994 when chisel was compared with moldboard plowing in the monoculture. In 1994, chickweed density was about five times greater in the chisel-plowed monoculture compared with other treatment combinations of rotation and tillage. In 1995, only one species with a density of six plants m(-2) occurred in the moldboard-plowed monoculture compared with three to six species and densities of 51 to 832 plants m(-2) in the other rotation by tillage treatments. Climatic conditions and herbicide use patterns in the different: crop rotation treatments may have contributed to the more dynamic nature of weed species diversity inthe barley monoculture. Reduced frequency of tillage and herbicide application; management of the forage stands, especially with regard to their termination; and improved soil resource availability likely explained the increased but more stable diversity of the weed communities in the barley-forage rotation.

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Documento generato il 28/11/20 alle ore 23:20:29