Table 17-a. Location comparison of mean estimated nitrogen release§ of 60 cover crop varieties evaluated in small plot replicated trials at three University of Tennessee AgResearch and Education Center locations in Tennessee during 2019-2020.
Variety Common Name Group Estimated N Released Over 12 wks (lbs/ac)
Apr† May
Avg. RECM MTREC ETREC Avg. RECM MTREC ETREC
Brassicas
Impact Collards Brassica 5 3 1 10 10 12 2 17
Extender Hyb. Brassica Brassica 4 8 0 4 5 10 2 4
Viva Hyb. Brassica Brassica 5 5 0 9 5 6 3 6
Vivant Hyb. Brassica Brassica 3 4 0 5 6 8 3 7
Aerifi Radish Brassica 6 11 1 6 10 17 4 10
Digger Radish Brassica 5 8 0 8 11 13 4 15
Driller Radish Brassica 4 8 0 4 9 12 3 13
SERALPHA Radish Brassica 6 9 0 9 11 11 2 20
SERWF19 Radish Brassica 7 13 1 8 8 12 5 6
Smart Radish Brassica 5 7 0 8 7 8 2 12
Jackpot Turnip Brassica 4 4 0 8 5 7 2 7
Average 4.9 7 0 7 8 11 3 11
Min 3 3 0 4 5 6 2 4
Max 7.3 13 1 10 11 17 5 20
Range 4.3 10 1 6 6 11 3 16
† Varieties that have any MS letter in common are not significantly different (Fisher’s Protected LSD, P<0.05). Mean separation was performed across all entries. Varieties within the “A group” were top performers across all entries and mean separation letters of these entries are highlighted in dark orange.
For ease of viewing, the table is broken into functional groups (brassicas, cereals, legumes). Mean values for top performers within each functional group are highlighted in light orange (50th – 75th percentile) and dark orange (> 75th percentile).
§ Estimated using quality constituents from near infrared spectroscopy inputted into the UGA cover crop nitrogen calculator.
Table 17-b. Location comparison of mean estimated nitrogen release§ of 60 cover crop varieties evaluated in small plot replicated trials at three University of Tennessee AgResearch and Education Center locations in Tennessee during 2019-2020.
Variety Common Name Group Estimated N Released Over 12 wks (lbs/ac)
Apr† May
Avg. RECM MTREC ETREC Avg. RECM MTREC ETREC
Cereals
Centurion Annual Ryegrass Cereal 2.3 3 1 3 3 2 4 4
Lowboy Annual Ryegrass Cereal 0.7 1 0 1 3 4 2 2
140760 Barley Cereal 1.7 2 2 1 -1 -2 2 -2
140789 Barley Cereal 2.3 2 1 4 1 1 2 1
140797 Barley Cereal 2 3 1 2 1 -2 5 0
SB255 Barley Cereal 2.7 3 2 3 1 0 3 1
Secretariat Barley Cereal 3.3 3 2 5 2 1 5 -1
Bates RS4 Cereal Rye Cereal 0.7 2 1 -1 -6 -6 -3 -9
Elbon (1) Cereal Rye Cereal 2 3 1 2 -5 -4 -3 -8
Elbon (2) Cereal Rye Cereal 3 3 3 3 -2 -1 -2 -4
Goku Cereal Rye Cereal 1.3 2 2 0 -4 -3 -2 -6
NF95319B Cereal Rye Cereal 1 2 2 -1 -5 -6 -1 -8
NF97325 Cereal Rye Cereal 0.3 2 1 -2 -6 -5 -4 -8
NF99362 Cereal Rye Cereal 1 2 2 -1 -5 -4 -3 -8
Wintergrazer 70 Cereal Rye Cereal 1 2 1 0 -4 -5 -3 -5
Yankee Cereal Rye Cereal 2.7 3 1 4 0 0 2 -1
Bob Oat Cereal 2.7 3 2 3 -2 -2 3 -6
Cosaque Oat Cereal 2.3 3 2 2 0 -2 3 -1
Hilliard Wheat Cereal 3 3 2 4 -2 -2 2 -6
Liberty 5658 Wheat Cereal 2 3 2 1 -1 -2 2 -4
Average 1.9 2.5 2 2 -2 -2 1 -3
Min 0.3 1 0 -2 -6 -6 -4 -9
Max 3.3 3 3 5 3 4 5 4
Range 3 2 3 7 9 10 9 13
† Varieties that have any MS letter in common are not significantly different (Fisher’s Protected LSD, P<0.05). Mean separation was performed across all entries. Varieties within the “A group” were top performers across all entries and mean separation letters of these entries are highlighted in dark orange.
For ease of viewing, the table is broken into functional groups (brassicas, cereals, legumes). Mean values for top performers within each functional group are highlighted in light orange (50th – 75th percentile) and dark orange (> 75th percentile).
§ Estimated using quality constituents from near infrared spectroscopy inputted into the UGA cover crop nitrogen calculator.
Table 17-c. Location comparison of mean estimated nitrogen release§ of 60 cover crop varieties evaluated in small plot replicated trials at three University of Tennessee AgResearch and Education Center locations in Tennessee during 2019-2020.
Variety Common Name Group Estimated N Released Over 12 wks (lbs/ac)
Apr† May
Avg. RECM‖ MTREC ETREC Avg. RECM MTREC ETREC
Legumes
FIXatioN Clover, Balansa Legume 12 23 4 9 37 50 27 33
Paradana Clover, Balansa Legume 5 6 3 5 15 23 12 11
Viper Clover, Balansa Legume 14 21 2 18 45 52 17 66
Balady Clover, Berseem Legume 1 . 0 1 7 15 2 3
Frosty Clover, Berseem Legume 5 7 6 2 32 59 29 8
AU Sunrise Clover, Crimson Legume 11 6 9 18 33 28 42 28
Bolsena Clover, Crimson Legume 13 10 13 15 30 19 41 31
Dixie Clover, Crimson Legume 12 5 14 17 33 35 44 21
Kentucky Pride Clover, Crimson Legume 9 1 19 6 32 20 55 22
SECCM18 Clover, Crimson Legume 13 4 13 22 37 28 43 39
White Cloud Clover, Crimson Legume 8 6 10 8 23 10 39 19
Big Red Clover, Red Legume 1 2 0 2 16 25 8 16
Blaze Clover, Red Legume 1 0 0 2 14 27 5 10
GA9909 Clover, Red Legume 2 0 0 6 24 21 9 42
VNS Clover, Red Legume 1 0 2 1 17 25 15 11
VNS Vetch, Common Legume 19 26 3 27 70 117 14 79
AU Merit Vetch, Hairy Legume 44 48 15 70 92 84 92 99
Patagonia Inta Vetch, Hairy Legume 37 56 20 35 63 62 75 51
Purple Bounty Vetch, Hairy Legume 29 36 18 33 53 34 72 54
Villana Vetch, Hairy Legume 25 42 18 16 62 84 65 36
WinterKing Vetch, Hairy Legume 40 47 25 48 62 67 74 44
Namoi Vetch, Woolypod Legume 27 31 14 36 46 55 37 46
Double OO Winter Pea Legume 17 22 9 20 52 67 47 42
Survivor Winter Pea Legume 22 34 13 20 70 76 75 59
VNS (1) Winter Pea Legume 21 30 22 12 56 77 53 37
VNS (2) Winter Pea Legume 24 46 7 20 66 75 63 60
Windham Winter Pea Legume 20 25 14 20 57 75 47 48
WyoWinter (1) Winter Pea Legume 19 34 10 14 66 101 56 42
WyoWinter (2) Winter Pea Legume 25 41 18 15 59 68 71 39
Average 16 22 10 18 44 51 42 38
Min 1 0 0 1 7 10 2 3
Max 44 56 25 70 92 117 92 99
Range 44 56 25 69 85 107 90 96
† Varieties that have any MS letter in common are not significantly different (Fisher’s Protected LSD, P<0.05). Mean separation was performed across all entries. Varieties within the “A group” were top performers across all entries and mean separation letters of these entries are highlighted in dark orange.
For ease of viewing, the table is broken into functional groups (brassicas, cereals, legumes). Mean values for top performers within each functional group are highlighted in light orange (50th – 75th percentile) and dark orange (> 75th percentile).
§ Estimated using quality constituents from near infrared spectroscopy inputted into the UGA cover crop nitrogen calculator.
‖ For entries with missing values for N content at RECM, mean N content across the remaining locations was used to estimate N release.
Table 17-d. Summary statistics for location comparison of mean estimated nitrogen release§ of 60 cover crop varieties evaluated in small plot replicated trials at three University of Tennessee AgResearch and Education Center locations in Tennessee during 2019-2020.
Group Estimated N Released Over 12 wks (lbs/ac)
Apr† May
Avg. RECM MTREC ETREC Avg. RECM MTREC ETREC
Brassicas
Average 4.9 7.3 0 7 8 11 3 11
Min 3 3 0 4 5 6 2 4
Max 7.3 13 1 10 11 17 5 20
Range 4.3 10 1 6 6 11 3 16
Cereals
Average 1.9 2.5 2 2 -2 -2 1 -3
Min 0.3 1 0 -2 -6 -6 -4 -9
Max 3.3 3 3 5 3 4 5 4
Range 3 2 3 7 9 10 9 13
Legumes
Average 16.4 21.8 10 18 44 51 42 38
Min 0.5 0 0 1 7 10 2 3
Max 44.3 56 25 70 92 117 92 99
Range 43.8 56 25 69 85 107 90 96
Across Groups
Average 9.5 12.5 6 11 22 26 21 19
Standard Error 0.1 0.3 2 5 0 1 2 3
Min 0.3 0 0 -2 -6 -6 -4 -9
Max 44.3 56 25 70 92 117 92 99
Range 44 56 25 72 98 123 96 108
§ Estimated using quality constituents from near infrared spectroscopy inputted into the UGA cover crop nitrogen calculator.
Virginia Sykes vsykes@utk.edu
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