Less intra-row weeds - experiences with a punch planter and a cycloid hoe based on GPS Jesper Rasmussen

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Less intra
-
row weeds
-

experiences with a punch
planter and a cycloid hoe based

on GPS


Jesper Rasmussen


jer@life.ku.dk


PHYSICAL AND CULTURAL WEED CONTROL, Samsun, 28


30 March 2011

Objective and hypotheses

The objective: To reduce intra
-
row weed densities
and sizes in direct sown row crops (sugar beet,
onion, carrot)

Two strategies

1.
To reduce intra
-
row weed emergence


Minimizing soil disturbance in the sowing
process


An automated prototype of a punch planter

2.
To improve the selectivity of mechanical intra
-
row weed control


Precision guidance of rotating tines


An intelligent tine rotor (the cycloid hoe)
based on a mapping technique (RTK
-
GPS)

PHYSICAL AND CULTURAL WEED CONTROL, Samsun, 28


30 March 2011

Soil disturbance stimulates weed germination

Chenopodium

album

(weed)

Poa

pratensis

(crop)



(Jensen, 1999)

PHYSICAL AND CULTURAL WEED CONTROL, Samsun, 28


30 March 2011

Theoretical relationship between weed density
and time

Slow germinating crop

Fast germinating crop

Crop emergence

Crop emergence

N: normal, N + F: N + flaming, P + F: punch planting + flaming

PHYSICAL AND CULTURAL WEED CONTROL, Samsun, 28


30 March 2011

Automated punch planting

PHYSICAL AND CULTURAL WEED CONTROL, Samsun, 28


30 March 2011

The punch planter

A punch planter unit (upper)

with dibber wheel, dibbers

and scrapers and

punched holes (lower)

with seeds embedded in

the bottom

PHYSICAL AND CULTURAL WEED CONTROL, Samsun, 28


30 March 2011

Automated punch planting in onions

in 2008
-
2009

The punch planting effect averaged 37% compared with N + F

N: normal, N + F: N + flaming, P + F: punch planting + flaming

(Rasmussen
et al
., 2011)

PHYSICAL AND CULTURAL WEED CONTROL, Samsun, 28


30 March 2011

Automated punch planting in carrots and
fodder beets in 2008
-
2009

The punch planting effect averaged 34% in carrots

compared with N + F

The punch planting effect averaged 0% in fodder beets

compared with N + F

(Rasmussen
et al
., 2011)

Lower effects than expected (
due to technical

shortcomings of the punch planter (?
)

PHYSICAL AND CULTURAL WEED CONTROL, Samsun, 28


30 March 2011

The punch planter

A punch planter unit (upper)

with dibber wheel, dibbers

and scrapers and

punched holes (lower)

with seeds embedded in

the bottom

PHYSICAL AND CULTURAL WEED CONTROL, Samsun, 28


30 March 2011

Punch planting in
sugar beets

1999
-
2000
(punch planting was carried out manually owing to
lack of an automated punch planter)


The punch planting effect averaged 30% compared with N + F

N: normal, N + F: N + flaming, P + F: punch planting + flaming

(Rasmussen, 2003)

Fast germinating crop

PHYSICAL AND CULTURAL WEED CONTROL, Samsun, 28


30 March 2011

The cycloid hoe

An a
utomated intelligent rotor tine weeder

PHYSICAL AND CULTURAL WEED CONTROL, Samsun, 28


30 March 2011

Cy
cloid hoe with (+) and without (
-
)
intelligent tine adjustment compared with
a weed
har
row

2008

2009

2009

2009

Fodder beets

PHYSICAL AND CULTURAL WEED CONTROL, Samsun, 28


30 March 2011

Conclusion


Automated punch planting reduced intra
-
row weed emergence in slow
-
germinating
crops like onion and carrot with about 35%
-

but there was no average in fodder beets


The cycloid hoe did not improve the
selectivity of intra
-
row weed control


Main reason: The cycloid hoe is
equipped with tines


cutting shares
are required


PHYSICAL AND CULTURAL WEED CONTROL, Samsun, 28


30 March 2011

Now we need a success story

http://www.garford.com/inrow.html


PHYSICAL AND CULTURAL WEED CONTROL, Samsun, 28


30 March 2011

Robocrop

with machine vision

PHYSICAL AND CULTURAL WEED CONTROL, Samsun, 28


30 March 2011

Robovator

from F. Poulsen Engineering,
Denmark

http://www.visionweeding.com/


PHYSICAL AND CULTURAL WEED CONTROL, Samsun, 28


30 March 2011

Robovator

PHYSICAL AND CULTURAL WEED CONTROL, Samsun, 28


30 March 2011

Conclusions

-

automated inteligent intra
-
row weeding

Possible in transplanted crops
-

c
ommercial
tools based on machine vision are available

Still probematic in direct sown crops


even if
crop positioning is based on mapping
techniques