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Brassica Cover Crop Variety Trial
Rose Lake Plant Materials Center
Bath, MI
August 13-Nov. 11, 2010
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Disclaimers
This was a one year study.
The weather was unusually favorable.
Sample sizes were not large (the sample quadrat was 2 ft².
Variability and LSDs tended to be high.
When data are presented, even if only some of the selections are covered the statistics were run on all 20 selections.
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About the Site…
100 miles from Lakes Erie, Michigan, and Huron
About 30” of precipitation spaced evenly over the year
Moderate to well draining black sand
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Rose Lake Plots
Photo by Rose Lake NRCS PMC
Photo by Rose Lake NRCS PMC
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Brassica Selections
Radishes: Groundhog
Defender
Tillage Radish
Daikon VNS Lot# LMR6 4
Daikon Midwood
Daikon Nema Common
Driller
Experimental Radishes:
GS‐733, IR‐14, NZS, MBS, LITH, COL
Forage Turnips: Pasja Appin
Mustards: Pacific Gold Ida Gold Accent Brown
Rapeseed: Dwarf Essex
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Planting
Planting: Aug. 13, 2010
Seeding rates:
Radishes 10 lb/A
Mustards 8 lb/A
Turnip 2 lb/A
Rapeseed 5 lb/A
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% Cover (Oct. 12)
0
10
20
30
40
50
60
70
80
90
100
OSR Groundhog OSR Defender OSR Daikon Nema Common
OSR Driller Tillage Radish
% S
oil
Co
ver
*Using ANOVA, there were no statistically significant differences in % soil cover.
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% Cover
Tillage Radish ‘Defender’
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Biomass (tons/A) (Oct. 12)
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
OSR Groundhog OSR Defender OSR Daikon Nema Common
OSR Driller Tillage Radish
Dry
Bio
mas
s (t
on
s/A
)
Above Ground
Below Ground
abcde abcde abcde
abcd
cde
e
bcde
abcde
bcde
abcd
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OSR ‘Groundhog’ OSR Daikon Nema Common
OSR Driller
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Tillage Radish
OSR ‘Defender’
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Biomass (tons/A) (Oct. 12)
0
0.5
1
1.5
2
2.5
OSR Groundhog OSR Defender OSR Daikon Nema Common
OSR Driller Tillage Radish
Dry
bio
mas
s (t
on
s/A
)
abc
bcd
cd
abcd
abc
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Tillage Radish OSR ‘Defender’
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Nitrogen Accumulation (lbs/A)
0
20
40
60
80
100
OSR Groundhog
OSR Defender OSR Daikon Nema
Common
OSR Driller Tillage Radish
N (
lbs/
A)
Below Ground Biomass
Above Ground Biomass
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N (lbs/A)
0
20
40
60
80
100
120
140
OSR Groundhog
OSR Defender OSR Daikon Nema
Common
OSR Driller Tillage Radish
Tota
l N (
lbs/
A)
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Flowering
Brassica Cover Crop % of Plots in Flower (out of 4) on Oct. 12, 2010
OSR Groundhog 0
OSR Defender 0
OSR Daikon Nema Common 100
OSR Driller 0
Tillage Radish 0
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Flowering
Of these five radish selections, OSR Daikon Nema Common was the earliest to flower. No selection of the total 20 set seed.
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Winter Kill As of Nov. 10, 2010, the Brassicas had yet to die off (though some were showing cold stress symptoms). By that date there was at least one hard frost and several lighter frosts.
OSR Daikon Nema Common
Photo by J. Durling, Rose Lake NRCS PMC.
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Photo by J. Durling, Rose Lake NRCS PMC
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Photo by J. Durling, Rose Lake NRCS PMC
November 10, 2010
Pollinators! In November! On a mustard.