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- Title
Estimation of thresholds for weed control in Australian cereals.
- Authors
Streibig, J. C.; Combellack, J. H.; Pritchard, G. H.; Richardson, R. G.
- Abstract
A non-linear model relating crop yield to the density of weeds was fitted to nine Victorian weeds to evaluate their competitive abilities. The weeds were: <em>Acroptilon repens</em> (L.) DC. (creeping knapweed), <em>Chondrilla Chondrilla juncea</em> L. (Skeleton weed), <em>Raphanus raphanistrum</em> L. (Wild radish), <em>lolium rigidum</em> Gaud. (Annual ryegrass), <em>Lithospermum arvense</em> L. (White iron weed), <em>Brassica tournefortii</em> Gouan (Wild turnip), <em>Lamium amplexicaule</em> L. (Deadnettle), <em>Fumaria parviflora</em> Lam. (White fumitory) and <em>Amsinckia hispida</em> (Ruiz & Pav.) I.M. Johnston (Amsinckia). Where more than one experiment was available for a weed, the net return for a herbicide treatment over a range of weed densities was calculated to obtain the economic threshold density. Generally, the economic threshold densities within a weed species were the same order of magnitude, except for the perennial <em>Chondrilla juncea</em> L., For this species data were collected in years of contrasting rainfall. The model used here is discussed in view of the threshold approach currently used in continental Europe.
- Subjects
WEEDS; RUSSIAN knapweed; LITHOSPERMUM; RYEGRASSES; HERBICIDES
- Publication
Weed Research, 1989, Vol 29, Issue 2, p117
- ISSN
0043-1737
- Publication type
Article
- DOI
10.1111/j.1365-3180.1989.tb00849.x