EurekaMag.com logo
+ Site Statistics
References:
52,654,530
Abstracts:
29,560,856
PMIDs:
28,072,755
+ Search Articles
+ Subscribe to Site Feeds
EurekaMag Most Shared ContentMost Shared
EurekaMag PDF Full Text ContentPDF Full Text
+ PDF Full Text
Request PDF Full TextRequest PDF Full Text
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter
Follow on LinkedInFollow on LinkedIn

+ Translate

Effects of density and soil nitrogen levels on growth of galinsoga quadriradiata and galinsoga parviflora in pure and mixed stands



Effects of density and soil nitrogen levels on growth of galinsoga quadriradiata and galinsoga parviflora in pure and mixed stands



Canadian Journal of Botany 64(11): 2708-2715



The responses of two sympatric annual weeds, Galinsoga quadriradiata Ruiz and Pavon (G. ciliata (Raf.) Blake) and G. parviflora Cav., which occur abundantly in croplands and early secondary successional communities of hill regions of northeast india, were studied in relation to population density, soil nitrogen, and nature of the stand (pure versus mixed stands). Both weeds exhibited density-dependent mortality which increased at a higher nitrogen level. In the case of G. quadriradiata more invididuals survived in a mixture than in monoculture, whereas G. parviflora showed the reverse trend. Growth of both weeds was better at a higher soil nitrogen level. Increased mortality and suppression of growth caused by an increase in density was also minimized in G. quadriradiata at the higher level of soil nitrogen. With an increase in population density, per-plant biomass and capitula production in both weeds showed an increase in positive skewness which, however, decreased at an increased nitrogen level. Galinsoga quadriradiata was less sensitive to density than G. parviflora regardless of soil nitrogen. At lower densities, both weeds grew better in a mixture than in pure stands, but at higher densities G. quadriradiata suppressed the growth of G. parviflora. Although the crude reproductive effort of the two weeds was independent of soil nitrogen, G. quadriradiata, in contrast to G. parviflora, exhibited a greater crude reproductive effort when grown either at higher densities or in a mixture.

(PDF emailed within 1 workday: $29.90)

Accession: 005298651

Download citation: RISBibTeXText



Related references

Effects of density and soil nitrogen levels on growth of Galinsoga quadriradiata and G. parviflora in pure and mixed stands. Canadian Journal of Botany 64(11): 2708-2715, 1986

The biology of canadian weeds 58. galinsoga parviflora and galinsoga quadriradiata synonym galinsoga ciliata. Canadian Journal of Plant Science 63(3): 695-710, 1983

Temperature relations of seed germination and ecological implications in Galinsoga parviflora and Galinsoga quadriradiata. Bartonia (48) 12-18, 1981

Determination of in vitro antioxidant and UV-protecting activity of aqueous and ethanolic extracts from Galinsoga parviflora and Galinsoga quadriradiata herb. Journal of Photochemistry and Photobiology. B, Biology 149: 189-195, 2016

Determination of antioxidant activity of extracts and fractions obtained from Galinsoga parviflora and Galinsoga quadriradiata, and a qualitative study of the most active fractions using TLC and HPLC methods. Natural Product Research 26(17): 1584-1593, 2012

Population regulation of galinsoga ciliata and galinsoga parviflora effect of sowing pattern population density and soil moisture and texture. Weed Research 23(3): 151-164, 1983

Reactive Nitrogen Species Scavenging Capacity of Aqueous and Ethanolic Extracts from Galinsoga parviflora and G. quadriradiata Herbs. Natural Product Communications 10(11): 1825-1828, 2016

Effect of density on individual size and fertility in two species of weeds: Galinsoga ciliata blake and Galinsoga parviflora cav. Polish Journal of Ecology 47(3): 353-357, 1999

Population regulation of galinsoga ciliata and galinsoga parviflora effect of 2 4 d application at different growth stages and light regimes. Weed Research 26(1): 59-68, 1986

Population regulation of Galinsoga ciliata (Raf.) Blake and Galinsoga parviflora Cav.: effect of 2,4-D application at different growth stages and light regimes. Weed research 26(1): 59-67, 1986

The biology of Canadian weeds. 58. Galinsoga parviflora and G. quadriradiata (= G. ciliata). Canadian Journal of Plant Science 63(3): 695-709, 1983

Cytogenetics of Galinsoga parviflora Cav. and Galinsoga ciliata (Raf.) Blake, and their natural hybrids (Asteraceae). New phytologist 91(3): 531-539, 1982

Insects associated with weeds of the northeastern usa quickweeds galinsoga ciliata and galinsoga parviflora compositae. Environmental Entomology 8(6): 1078-1082, 1979

Galinsoga mosaic virus Potato weed, Galinsoga parviflora, Queensland, Australia. Descriptions of plant viruses Commonwealth Mycological Institute: 982 set 16 (252), 1982

Insects associated with weeds of the northeastern United States: Quickweeds, Galinsoga ciliata and Galinsoga parviflora (Compositae). Environmental entomology 8(6): 1078-1082, 1979