Influence of interference from a mixed weed species stand on soybean (Glycine max (L.) Merr.) growth

Field experiments were conducted to examine soybean-weed interactions under Ontario conditions. Trials were conducted at Elora, Ontario in 1990 and 1991 using comparative growth analysis to investigate the aboveground response of soybean to weed interference from a mixed weed species stand. Although...

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Bibliographic Details
Published in:Canadian journal of plant science 1993-10, Vol.73 (4), p.1293-1304
Main Authors: Van Acker, R.C, Weise, S.F, Swanton, C.J
Format: Article
Language:English
Subjects:
Agronomy. Soil science and plant productions
Biological and medical sciences
BIOLOGICAL COMPETITION
CARACTERES DE RENDIMIENTO
COMPETENCIA BIOLOGICA
COMPETITION BIOLOGIQUE
COMPOSANTE DE RENDEMENT
CONTENIDO DE MATERIA SECA
CRECIMIENTO
CROISSANCE
DRY MATTER CONTENT
DRY MATTER DISTRIBUTION
EMERGENCE
EMERGENCIA
FOTOSINTESIS
Fundamental and applied biological sciences. Psychology
Generalities, botany, ecology, damages, economic importance
GLYCINE MAX
GROWTH
LEVEE
MALEZAS
MATHEMATICAL MODELS
MAUVAISE HERBE
MODELE MATHEMATIQUE
MODELOS MATEMATICOS
NET ASSIMILATION RATE
ONTARIO
Parasitic plants. Weeds
PHOTOSYNTHESE
PHOTOSYNTHESIS
Phytopathology. Animal pests. Plant and forest protection
SEEDLING EMERGENCE
TENEUR EN MATIERE SECHE
WEEDS
YIELD COMPONENTS
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Description
Summary:Field experiments were conducted to examine soybean-weed interactions under Ontario conditions. Trials were conducted at Elora, Ontario in 1990 and 1991 using comparative growth analysis to investigate the aboveground response of soybean to weed interference from a mixed weed species stand. Although season-long weed interference caused a significant decrease in soybean grain yield, weeds could remain in the crop up to 40 d after emergence, between R1 and beginning pod development stage (R3), in 1990 and up to 16 d after emergence, 3rd node development stage (V3), in 1991 without causing more than a 5% yield loss. These critical times of weed removal coincided with the timing of significant effects of weed interference on soybean LAI. Weed interference also significantly reduced total aboveground soybean dry weight and crop growth rate. Pods m −2 was the yield component most affected by season-long weed interference. Although there was no consistent effect of weed interference upon net assimilation rate and leaf weight ratio, weed interference resulted in a decrease in dry weight distribution to branch stems, causing as much as a fivefold reduction in allocation to branch stems. It may be useful to develop early branching soybean varieties, or use narrower row spacing, to enhance soybean competitiveness against weeds. Key words: Soybean (Glycine max), weed interference, growth analysis, leaf area, yield components
ISSN:0008-4220
1918-1833
DOI:10.4141/cjps93-168