November 2024 - 43

VEG CONNECTIONS
week tarps were applied May 4 and
two-week tarps were applied May 15.
Plots with no tarp were included
as a control treatment. All tarps
were removed on May 30. After tarp
removal, clear tarp and control
treatments were lightly tilled to
eliminate germinated weeds. All
treatments were lightly harrowed in
planting rows to loosen soil for easy
planting of 'Candy' and 'Patterson'
onion transplants.
Onions were drip irrigated and
total rainfall was 5.6 inches from
June to August. Broadleaf and grass
weed height, count and weight data
were collected biweekly throughout
the growing season. Data for
marketable and cull onion yield was
collected after harvest and curing.
At tarp removal, all black side
up and white side up silage tarps
showed low broadleaf and grass
weed counts, heights and total
biomass. The control and six-week
clear tarp plots had the highest grass
weight averages, followed by twoweek
clear and four-week clear.
Broadleaf weed counts were
highest in the control treatment
followed by the clear tarp
treatments. Grass counts were
highest in the two-week clear
treatment, closely followed by the
six-week clear treatment and the
control treatment.
Data collected on June 12, two
weeks after tarp removal and
planting, showed an average
broadleaf weed count per acre in
the 6-week clear treatment to be
67% less than the control treatment,
supporting solarization to have
reduced the weed seed bank.
There were no differences in
onion yield due to tarp treatment.
This was most likely due to biweekly
hand weeding after each data
collection event.
From one year of data, there is
evidence to support occultation
can reduce weed pressure at tarp
removal, and solarization may
reduce weed pressure in growing
season when applied for 6 weeks.
Tarping, however, should be used
along with other weed management
to produce optimum onion yield.
To learn more about ongoing soil
tarping research, visit extension.
sdstate.edu/tags/horticultureresearch.
Hannah
Voye is a graduate
research assistant who is completing
her second year as a graduate
student studying Plant Science at
South Dakota State University. She
can be reached at hannah.voye@
sdstate.edu.
Rhoda Burrows is a professor at
South Dakota State University and
can be reached at rhoda.burrows@
sdstate.edu.
Kristine Lang is an assistant
professor at South Dakota State
University and can be reached at
kristine.lang@sdstate.edu.
VEGETABLEGROWERSNEWS.COM | 43

http://www.sdstate.edu/tags/horticulture https://seregionalconference.org/ http://www.VEGETABLEGROWERSNEWS.COM

November 2024

Table of Contents for the Digital Edition of November 2024

Editor's Letter
Tomato farming success
Mesotunnels impact
Great Lakes EXPO: Unlocking farm potential
Great Lakes EXPO Schedule
Hydroponics
Seed Variety Showcase
Organic Grower
40 Under Forty Fresh Views
Veg Connections
Farm Market & Agritourism
Ag Labor Review
Classifieds
Advertiser Index
November 2024 - 1
November 2024 - 2
November 2024 - 3
November 2024 - Editor's Letter
November 2024 - 5
November 2024 - Tomato farming success
November 2024 - 7
November 2024 - 8
November 2024 - Mesotunnels impact
November 2024 - 10
November 2024 - Great Lakes EXPO: Unlocking farm potential
November 2024 - Great Lakes EXPO Schedule
November 2024 - 13
November 2024 - Hydroponics
November 2024 - 15
November 2024 - 16
November 2024 - 17
November 2024 - 18
November 2024 - Seed Variety Showcase
November 2024 - 20
November 2024 - 21
November 2024 - 22
November 2024 - 23
November 2024 - 24
November 2024 - 25
November 2024 - 26
November 2024 - 27
November 2024 - 28
November 2024 - 29
November 2024 - 30
November 2024 - 31
November 2024 - 32
November 2024 - 33
November 2024 - 34
November 2024 - Organic Grower
November 2024 - 36
November 2024 - 37
November 2024 - 38
November 2024 - 39
November 2024 - 40 Under Forty Fresh Views
November 2024 - 41
November 2024 - Veg Connections
November 2024 - 43
November 2024 - Farm Market & Agritourism
November 2024 - 45
November 2024 - Ag Labor Review
November 2024 - 47
November 2024 - Classifieds
November 2024 - 49
November 2024 - Advertiser Index
November 2024 - 51
November 2024 - 52
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