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- Title
Competition between annual weeds and vining peas grown at a range of population densities: effects on the weeds.
- Authors
Lawson, H. M.; Topham, P. B.
- Abstract
Linear regression of dry weight of weeds against crop density, together with the use of diversity indices and principal component analysis were used to derive information about changes in the behavior of annual weeds over the growing season and in response to a wide range of crop densities in vining peas <em>Pisum sativum</em> L. Using linear regression it was possible to quantify reductions in weed dry weights per unit increase in crop plant density. The 'weed loss' factor was acceptably consistent between experiments. Indices examining richness and evenness showed that numbers of weed species declined with increasing crop density and as the season progressed, but although species evenness became less at successive sampling dates the presence of a pea crop, whatever its density, did not radically alter the composition of the weed flora. Principal component analysis demonstrated that although there was competition within the weed flora, the crop did not replace the dominant weed species on high density plots, but reduced growth of all weed species alike.
- Subjects
REGRESSION analysis; WEEDS; CROPS; PLANTS; GARDENING
- Publication
Weed Research, 1985, Vol 25, Issue 3, p221
- ISSN
0043-1737
- Publication type
Article
- DOI
10.1111/j.1365-3180.1985.tb00638.x