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- Title
Apera spica-venti population dynamics and impact on crop yield as affected by tillage, crop rotation, location and herbicide programmes.
- Authors
MELANDER, B.; HOLST, N.; JENSEN, P. K.; HANSEN, E. M.; OLESEN, J. E.
- Abstract
Apera spica-venti is a winter annual grass and, increasingly, a severe weed problem in autumn-sown crops. Non-inversion tillage has become more common in Denmark in recent years, but may accentuate problems with A. spica-venti. These problems may be avoided, if selected preventive and cultural weed management practices are adopted. To this end, we conducted a 4-year field study investigating the effects of crop rotation, tillage method, location and limited herbicide input on A. spica-venti population dynamics and crop yield. Additionally, detailed studies were performed on the fate of A. spica-venti seeds when incorporated to different soil depths. The location with a lighter soil texture, cooler climate and higher rainfall favoured A. spica-venti growth and consequently crop yield loss, especially in the crop sequence comprised only of autumn-sown crops and with non-inversion tine tillage. Incorporating A. spica-venti seeds in the soil improved their survival, explaining the higher A. spica-venti proliferation seen with tine tillage as opposed to direct drilling. The rotations including an even mixture of spring- and autumn-sown crops did not lead to noteworthy changes in the A. spica-venti population, irrespective of tillage method. Thus, in many regions, management of A. spica-venti will require rotations that balance autumn- and spring-sown crops.
- Subjects
CROP yields; SOIL productivity; WEEDS; CROPS; CROP rotation; CROPPING systems; CROPS &; soils; TILLAGE; HERBICIDES; RAINFALL
- Publication
Weed Research, 2008, Vol 48, Issue 1, p48
- ISSN
0043-1737
- Publication type
Article
- DOI
10.1111/j.1365-3180.2008.00597.x