We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
The demography of Datura ferox (L.) in soybean crops.
- Authors
Ballaré, C. L.; Scopel, Ana L.; Ghersa, C. M.; Sánchez, R. A.
- Abstract
The emergence, survival, seed production and seed dispersal of <em>Datura ferox</em> was studied in soybean fields in 1982-1983 and 1984-1985. Most seedling emergence occurred within one month of crop sowing. Later germination, associated with inter-row cultivation, represented 4-26% of the total seedlings, and none survived to seed production. Only 5% of the first cohort in 1982-1983, and 7% in 1984-1985, survived to seed production; it was independent of initial density. Although weed density was greatly reduced by control measures, negative relationships were observed between peak seedling density and plant height, stem diameter, number of ramifications, number of reproductive structures and seed production per plant. Only a small proportion of seeds (about 1%) were shed prior to soybean harvest. Combine harvesters collected more than 90% of capsules, but between 7% and 40% of the seeds were returned to the field. Seed viability was unaffected by passing through the machine. The patterns of seed dispersal varied depending on the design of the combine harvester. Two models shed seeds between 0 m and 21 m from their source, but another shed seeds between 0 m and 98 m. Calculations, based in life history parameters, showed that weed seed production would increase more rapidly if the seeds were dispersed during crop harvesting than if they are not, even when the return of seeds to the soil by the combine is not large.
- Subjects
SEED processing; AGRICULTURAL processing; PLANTING; SOYBEAN; SOWING; PLANT propagation; HARVESTING
- Publication
Weed Research, 1987, Vol 27, Issue 2, p91
- ISSN
0043-1737
- Publication type
Article
- DOI
10.1111/j.1365-3180.1987.tb00741.x