7251 2 archive 1042 disk0/00/00/72/51 2006-05-10 2009-09-09 13:39:35 2009-08-20 14:30:21 conference_item show 0 en int_conf_joint2006_4 de-uni-bonn-organischer-landbau May 30-31, 2006 Joint Organic Congress Odense, Denmark never 0 TRUE paper Lukashyk P. Berg M. Köpke U. pub 9weed Abstract - Three strategies for controlling Cirsium arvense including (1) repeated stubble tillage with subsequent forage crop cultivation, (2) repeated mowing of a grass-clover ley, and (3) forage crop cultivation following a grass-clover ley ploughed in May/June were investigated in field experiments over 3 years. The development of C. arvense shoot density was regularly assessed on subplots with defined thistle densities. In the medium-term (9 months), repeated stubble tillage (treatment 1) decreased shoot density of C. arvense more effectively than a once mowed grass-clover ley (2). However, after 22 months, treatments 1 and 2 resulted in a similar strong reduction of C. arvense shoot density of 95 % and 97 %, respectively. At this time, the efficacy of treatment 3 was lower (89 %), however, not signifi-cantly different to that of treatments 1 and 2. After 26 months, the effect of all treatments was still appar-ent; however, the efficacy of treatment 3 was signifi-cantly lower than that of treatment 2. Generally, the different strategies showed only minor differences, thus delivering options for optimal strategies of this-tle control under given specific conditions of site and cropping systems. 2006 published public 5549 1 7251 1 rtf de public

C.arvense_Daenemark.rtf

C.arvense_Daenemark.rtf 45485 http://orgprints.org/7251/1/C.arvense_Daenemark.rtf