David Hansson &Sven-Erik Svensson 2011-03-28 Swedish University of Agricultural Sciences, Alnarp.

David Hansson &Sven-Erik Svensson 2011-03-28 Swedish University of Agricultural Sciences, Alnarp

Område Jordbruk - odlingssystem, teknik och produktkvalitetwww.slu.seDavid Hansson &Sven-Erik Svensson 2011-03-28 Swedish University of Agricultural Sciences, Alnarp

Effect of flame weeding at different time intervals before crop

emergence

Område Jordbruk - odlingssystem, teknik och produktkvalitetwww.slu.se

David Hansson 2009-12-08

Project: Effective weed management in row-grown organic vegetables

Participatory research

The experiments were designed and analysed etc. after a discussion with: farmers, advisers and researchers

The experiments were performed on 3 different farms

Participatory research

• Exchange of experience between farmers, advisers and researchers.

• Participatory research gives more solutions and faster changes.

• Present issues are in focus which gives a greater engagement.

• Participatory research involves a holistic approach to solve problems.

• The hole group is responsible to ask questions, analyse and participate.

David Hansson & Sven-Erik Svensson 2011-03-28 Swedish University of Agricultural Sciences, Alnarp


Weed management system

Time

False seedbed Seedbed preparation

False seedbed Sowing

Delayed sowing

Flame weeding

Emergence



Organic grow carrots

Experimental plan

Experimental treatments, flame weeding:

• 2 days before (beginning) emergency

• 1 day before emergency

• 0 day at emergency

• 2 days after emergency

• Untreated control (unflamed)

David Hansson 2011-03-28 Swedish University of Agricultural Sciences, Alnarp



Picture 31 May, 2&1 days before flaming



Picture 31 May, 1&5 days before flaming



Assessment 20 June, a few days before hand weeding



Unflamed control



Flame weeding 2 days before beginning emergency



Flame weeding 1 day before beginning emergency



0 day at beginning of emergency



2 days after beginning emergency



0 2 4 6 80

20

40

60

80

100

120

140

160

180

200

Ramdala. Antal ogräs 24 dagar efter sådd. Senast förändrad 2007-10-05

W

ee

d n

um

be

r (n

o. m

-2)

Flame weeding, days after sowing



0 2 4 6 8 10

0

50

100

150

200

250

300

0 2 4 6 8 10

0

10

20

30

40

50

60

70

80

90

100

Ha

nd

we

ed

ing

(h

ha

-1)

Flaming, days after sowing

Ramdala. Hand weedning 29 dagar after drilling. Senast förändrad 2007-07-04

Em

erg

en

ce (%

ca

rro

ts)

Hand weeding 29 days after drilling, no. carrots at the time of flaming



One day postponed flaming resulted in;• 10 % increased weed control effect,

• 10-15 h per hectare reduced need for hand weeding.



9 10 11 120

20

40

60

80

100

Senast förädrad 2009-10-08

We

ed

nu

mb

er

(no

. m-2

)

Flame weeding, days after sowing

Assessment 26 June

Weed number a few days before hand weeding



Weed number a few days before hand weeding

If flaming before crop emergence was delayed by;

• 3 days, the amount of weeds at the time of hand weeding was reduced by half.

• 2 days, the amount of weeds at the time of hand weeding was decreased by one-third.

David Hansson &Sven-Erik Svensson 2011-03-28 Swedish University of Agricultural Sciences, Alnarp.

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