PlumX Metrics
Embed PlumX Metrics

Intraspecific competition between Amaranthus hybridus L. and A. viridis L

Pesquisa Agropecuaria Brasileira, ISSN: 0100-204X, Vol: 34, Issue: 8, Page: 1319-1325
1999
  • 5
    Citations
  • 6,524
    Usage
  • 13
    Captures
  • 0
    Mentions
  • 0
    Social Media
Metric Options:   Counts1 Year3 Year

Metrics Details

Article Description

Intraspecific competition trials were carried out for Amaranthus viridis L. and A. hybridus L., the latter species with two distinct biotypes, a green and a purple type. Three independent trials were made, with five different seed densities per pot for each species or biotype. In general terms, seeds that germinated promptly were responsible for the formation of the next generation, these early seedlings being more competitive. The carrying capacity was reached with 20 seeds per pot, no increase in the number of adult plants observed by increasing the seed density. This shows that the environmental suporting capacity, not the size of the seed bank in the soil, regulates the population size. A similar conclusion holds true for dry matter yield. Under competition, the species A. hybridus - green biotype and A. viridis produced larger biomass for reproductive structures (22% to 34%) than A. hybridus - purple biotype (15% to 18%), the former species being therefore better r-strategists than the latter.

Provide Feedback

Have ideas for a new metric? Would you like to see something else here?Let us know