The field experiments were conducted in 1995 and 1996. Seedbed preparation was done with a rotary tiller to 15-20 cm depth either 5-7 days prior to sowing of carrot or at the day of sowing. In both cases, flaming was done 8 days after sowing

Vanhala, Petri

English

Organic Eprints

EUROPEANWEEDRESEARCHSOCIETYAbstracts4th EWRS Workshop onPhysical Weed ControlElspeet, The Netherlands20-22 March 2000Compiled and produced byDaniel CloutierFebruary 18, 20024th EWRS Workshop on Physical Weed Control,  27 Elspeet, The Netherlands, 20-22 March 2000    Relationship Between The Timing Of Seedbed Preparation And  The Efficacy Of Pre-Emergence Flaming  Petri Vanhala Agricultural Research Centre (MTT), Plant Protection, FIN-31600 Jokioinen, Finland mailto:petri.vanhala@mtt.fi  Abstract Many weed species have an emergence peak in spring. When flaming weeds prior to crop emergence, the timing is important. The proportion of weeds killed by pre-emergence flaming might be increased by timing seedbed preparation some days before the sowing of the crop. In these experiments we studied the timing of seedbed preparation in relation to sowing date in order to enhance weed emergence and thus improve the efficacy of thermal weed control.   The field experiments were conducted in 1995 and 1996. Seedbed preparation was done with a rotary tiller to 15-20 cm depth either 5–7 days prior to sowing of carrot or at the day of sowing. In both cases, flaming was done 8 days after sowing. Weeds were counted i) on flaming date, ii) 5 days after flaming, and iii) 13 or 21 days after flaming.  When the seedbed preparation was done 5 to 7 days before sowing, more than 75% of the weeds germinated before carrot, and were thus controlled by flaming. Whereas, when the seedbed preparation was done in connection with sowing, only 25–35% of the weeds germinated before carrot. The most abundant weed species in the study were Chenopodium album, Stellaria media, Viola arvensis and Matricaria matricarioides.  Manipulating weed emergence by timing seedbed preparation several days apart from sowing gives an opportunity for better weed control by flaming than simultaneous seedbed preparation and sowing. Consequently, need for additional (hand)weeding is reduced. Models and software for forecasting emergence could be used as a further improvement.  Table 1.  Timing of seedbed preparation and control effect of flaming in 1995 and 1996       Annual weeds (number m-2) Year Seedbed preparation  Sowing On flaming date (14.6.-95  or 5.6.-96) 5 days after flaming 13 days after flaming 21 days after flaming 1995  1 June  6 June  172  16  28     6 June  6 June  60  46  57   1996  21 May  28 May  653  48    194   28 May  28 May  174  108    458  

Relationship between the timing of seedbed preparation and the efficacy of pre-emergence flaming

Abstract

Similar works

Full text

Available Versions

Organic Eprints