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Tolerance to weed harrowing in spring barley genotypes

Hansen, Preben Klarskov (2005) Tolerance to weed harrowing in spring barley genotypes. In: Proceedings from the 13th European Weed Research Society (EWRS) Symposium, CD-ROM.

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Summary

Controlling weeds in spring cereals grown under organic conditions is mostly done by post emergence weed harrowing, where spring tines of the weed harrow control weeds by uprooting and/or covering small weeds plants with soil. In situations with relatively large weed plants and relatively small crop plants, there are increased risks for crop damages by soil coverage or other mechanical damages of the crop leaves. These damages are increasing with increasing weed control intensity, and are resulting in reduced crop growth immediately after weed harrowing. There are risks that the reduced growth reduces final crop yield too. However, there is some evidence that there are varietal differences in the tolerance to weed harrowing.
The aim of this study was to estimate the damages by weed harrowing in four pure genotypes and three two- or one three-component mixtures of spring barley, and to analyze if there were differences in tolerance to weed harrowing between the genotypes and mixtures.
Results from a two-year field study showed that there were varietal differences in the tolerance to mechanical weed control in the immediate effect as well as the short term effect, however there were marked differences in the immediate and short term effect between the two years. Regarding the long term effect of weed harrowing on yield, there were no significant differences in 2003 but in 2004, Brazil and the three component mixture suffered significantly from weed harrowing while Modena, Otira and Modena+Orthega mixture, seems to benefit from weed harrowing. The reason for these differences is probably due to differences in growth habit at the time for weed harrowing.


EPrint Type:Conference paper, poster, etc.
Type of presentation:Poster
Keywords:Mechanical; weed; control; tolerance;varieties;sensor;measurements;
Subjects: Crop husbandry > Crop health, quality, protection
Crop husbandry > Weed management
Crop husbandry > Breeding, genetics and propagation
Research affiliation: Denmark > DARCOF II (2000-2005) > VI.2 (BAR_OF) Characteristics of spring barley varieties for organic farming
Denmark > SOAR - Research School for Organic Agriculture and Food Systems
Deposited By: Hansen, Preben Klarskov
ID Code:5913
Deposited On:30 Sep 2005
Last Modified:12 Apr 2010 07:31
Document Language:English
Status:Published
Refereed:Not peer-reviewed

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