Factors affecting germination of horseweed (Conyza canadensis)
- 1 October 2006
- journal article
- Published by Cambridge University Press (CUP) in Weed Science
- Vol. 54 (5), 898-902
- https://doi.org/10.1614/ws-06-006r2.1
Abstract
The influence of environmental factors on germination and emergence of horseweed was examined in growth chamber experiments. Germination was highest (61%) under 24/20 C day/night temperature under light. Horseweed seed germination was observed under both light (13 h photoperiod) and complete darkness (24 h), but germination under continuous darkness was only 0 to 15% compared with 0 to 61% under light. All other experiments were conducted under 24/20 C and 13-h light conditions. Germination was 19 to 36% over a pH range from 4 to 10, with a trend toward higher germination under neutral-to-alkaline conditions. Horseweed germination was > 20% at < 40 mM NaCl concentration and lowest (4%) at 160 mM NaCl. These data suggest that even at high soil salinity conditions, horseweed can germinate. Germination of horseweed decreased from 25% to 2% as osmotic potential increased from 0 (distilled water) to −0.8 MPa, indicating that germination can still occur under moderate water stress conditions. Horseweed seedling emergence was at its maximum on the soil surface, and no seedlings emerged from seeds placed at a depth of 0.5 cm or higher.Keywords
This publication has 26 references indexed in Scilit:
- Factors affecting germination of horseweed (Conyza canadensis)Weed Science, 2006
- Factors affecting seed germination, seedling emergence, and survival of texasweed (Caperonia palustris)Weed Science, 2004
- Perspectives on Glyphosate ResistanceWeed Technology, 1997
- Diurnally Alternating Temperatures Stimulate Sprouting of Purple Nutsedge (Cyperus rotundus) TubersWeed Science, 1996
- Effects of Tillage Systems and Weed Management on Weed Populations in Grain Sorghum (Sorghum bicolor)Weed Science, 1994
- Population Dynamics and Control of Annual Weeds in Corn (Zea mays) as Influenced by Tillage SystemsWeed Science, 1992
- Mode of action of paraquat in leaves of paraquat‐resistant Conyza canadensis (L.) CronqPlant, Cell & Environment, 1992
- Redvine (Brunnichia ovata) Germination and EmergenceWeed Science, 1991
- Germination Ecology of Milkweedvine (Morrenia odorata)Weed Science, 1984
- Germination and Seedling Development of Common Milkweed and Other SpeciesWeed Science, 1972