Location comparison mean percent total nitrogen content

Table 16-a. Location comparison of mean percent total nitrogen content‡ 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.

VarietyCommon NameGroupTotal Nitrogen (%)              
Apr†May
Avg.RECMMTRECETRECAvg.RECMMTRECETREC
Brassicas
ImpactCollardsBrassica2Q-S2.1J-N1.8O-X2.1L-O1.9N-Q2.1L-Q1.8M-P1.7M-O
ExtenderHyb. BrassicaBrassica1.9S-W2.1J-P2N-U1.6O-U1.6P-S1.7N-S1.7O-Q1.4O-Q
VivaHyb. BrassicaBrassica1.9S-W1.8J-Q1.9N-V1.9M-Q1.6Q-S1.5R-U2L-O1.2P-U
VivantHyb. BrassicaBrassica2Q-T1.9J-Q1.9N-W2.2K-N1.9M-P2.1L-P2L-O1.6N-P
AerifiRadishBrassica1.9ST2.2J-M2.1L-R1.6O-U1.6P-R1.6O-S2K-O1.3O-S
DiggerRadishBrassica2.1P-S2.1J-N2.3J-N1.9M-Q1.8O-Q1.6O-S2.3G-M1.4O-Q
DrillerRadishBrassica2Q-S2.2J-L2.1L-Q1.7N-R1.8O-R1.8N-S2.2I-O1.4O-R
SERALPHARadishBrassica1.9S-U2.3JK1.7P-Y1.8N-R1.7P-R1.5Q-T2.1J-O1.4O-Q
SERWF19RadishBrassica2Q-S2.4IJ1.9N-U1.7N-S1.6P-S1.4R-W2.2H-O1.1Q-V
SmartRadishBrassica1.9R-T2.2J-M2M-S1.6O-T1.5RS1.4S-W1.8M-P1.3O-S
Jackpot TurnipBrassica2R-T2.1J-O1.8N-W2M-P1.6P-S1.5P-V1.9M-P1.3O-Q
Average22.1222221
Min1.91.8221121
Max2.12.4222222
Range0.20.6110111

† 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).
‡ Analyzed using near infrared spectroscopy (NIRS) with the appropriate calibration for each species.

 

Table 16-b. Location comparison of mean percent total nitrogen content‡ 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.

VarietyCommon NameGroupTotal Nitrogen (%)              
Apr†May
Avg.RECMMTRECETRECAvg.RECMMTRECETREC
Cereals
CenturionAnnual RyegrassCereal1.5X-AA1.5O-Q1.7Q-Y1.5P-V1TU0.9W-Y1.2RS1.1Q-V
LowboyAnnual RyegrassCereal1.9ST2.2J-M1.9N-U1.7N-R1.3ST1.3S-X1.4P-R1.3O-T
140760BarleyCereal1.5X-B1.5PQ1.9N-W1.1V-X0.9U-Y0.8W-Y1.1RS0.8U-W
140789BarleyCereal1.6W-Z1.7K-Q1.8N-W1.2S-X1U-W1T-Y1.1RS0.9R-W
140797BarleyCereal1.6U-Y1.7K-Q2N-T1.2T-X1UV1U-Y1.2RS0.9R-W
SB255BarleyCereal1.6V-Z1.6L-Q1.8O-X1.4Q-W1U-X0.9V-Y1.1RS0.9S-W
SecretariatBarleyCereal1.7T-X1.7J-Q1.9N-W1.5Q-V1U-W0.9T-Y1.2RS0.8T-W
Bates RS4Cereal RyeCereal1.2AA-CC1.3Q1.3Y1WX0.6Y0.6Y0.7S0.5W
Elbon (1)Cereal RyeCereal1.4X-C1.5N-Q1.5T-Y1.2S-X0.6Y0.7Y0.7S0.5W
Elbon (2)Cereal RyeCereal1.6U-Y1.8J-Q1.8O-X1.3R-X0.8U-Y0.9W-Y0.8S0.7W
GokuCereal RyeCereal1.4Y-C1.6M-Q1.5U-Y1V-X0.8V-Y0.8XY0.8S0.6W
NF95319BCereal RyeCereal1.2AA-CC1.3Q1.3Y0.9X0.7XY0.6Y0.9S0.5W
NF97325Cereal RyeCereal1.2AA-CC1.4Q1.3XY0.9X0.6Y0.7XY0.7S0.5W
NF99362Cereal RyeCereal1.2AA-CC1.3Q1.4W-Y0.9X0.6Y0.7Y0.7S0.5W
Wintergrazer 70Cereal RyeCereal1.3AA-CC1.3Q1.4V-Y1V-X0.7W-Y0.7Y0.7S0.7W
YankeeCereal RyeCereal1.9S-V2.2J-M2.1M-S1.5P-V1T-V1T-Y1.2Q-S0.9S-W
BobOatCereal1.4X-CC1.5PQ1.6R-Y1.1V-X0.9U-Y0.8XY1RS0.7VW
CosaqueOatCereal1.4Y-CC1.3Q1.7P-Y1.1U-X0.8U-Y0.8XY1.1RS0.8U-W
HilliardWheatCereal1.4X-CC1.5PQ1.6S-Y1.2R-X0.8U-Y0.8XY1RS0.7VW
Liberty 5658WheatCereal1.3Z-CC1.4Q1.4V-Y1.1V-X0.9U-Y0.8XY1.1RS0.7VW
Average1.51.6211111
Min1.21.3111110
Max1.92.2221111
Range0.80.9111111

† 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).
‡ Analyzed using near infrared spectroscopy (NIRS) with the appropraite calibration for each species.

 

Table 16-c. Location comparison of mean percent total nitrogen content‡ 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.

VarietyCommon NameGroupTotal Nitrogen (%)              
Apr†May
Avg.RECM‖MTRECETRECAvg.RECMMTRECETREC
Legumes
FIXatioNClover, BalansaLegume3.3E-G4E-G2.8F-I3.1C-G2.6IJ2.9F-J2.6E-I2.4E-J
ParadanaClover, BalansaLegume2.6L-N3HI2.5I-M2.3J-M2.1K-N2.1L-O2.2I-O2.1I-M
ViperClover, BalansaLegume3.1G-J4.1E-G2.2K-O3.1D-H2.4JK2.6I-L2.2I-O2.4D-I
BaladyClover, BerseemLegume1.6U-Y.1.6R-Y1.7O-T2.2KL2.2K-P1.8N-P2.7C-F
FrostyClover, BerseemLegume3H-K3.5GH2.9E-I2.6G-K2.7IJ3.1E-I2.6E-I2.3F-L
AU SunriseClover, CrimsonLegume2.7LM.2.6G-K2.8F-J2.1K-N2.2L-O2.3G-N2L-N
BolsenaClover, CrimsonLegume2.9I-L3HI2.7F-J2.9D-I2.1K-N2.3K-N2.1I-O2I-M
DixieClover, CrimsonLegume2.8K-M.3D-H2.6G-K2.2KL2.4J-M2.3G-M2I-N
Kentucky PrideClover, CrimsonLegume2.8KL.3C-G2.6H-K2.2KL2.2K-O2.3G-N2.2H-L
SECCM18Clover, CrimsonLegume2.8J-L2.9HI2.9E-I2.7G-J2.2K-M2.2K-N2.3G-N2K-N
White CloudClover, CrimsonLegume2.7K-M.2.9E-I2.5I-L2L-O2M-R2.2I-O1.9L-N
Big RedClover, RedLegume2.3O-Q.1.7P-Y2.7G-J2.6IJ2.9G-J2.4F-L2.6C-H
BlazeClover, RedLegume2.3N-P.2M-S2.7G-K2.9G-I3.5C-F2.6E-K2.7C-E
GA9909Clover, RedLegume2.5M-O.2.1K-P2.8E-I3F-H2.8H-J3B-E3.3B
VNSClover, RedLegume2.2O-R.2.2K-O2.3J-M3F-H3.7B-D2.8D-G2.6C-H
VNSVetch, CommonLegume3.3F-H4E-G2.5H-L3.2C-F2.7IJ3.2D-H2.6E-J2.2G-L
AU MeritVetch, HairyLegume4.1A4.4B-E3.5AB4.3A3.9A4.3A3.5AB3.9A
Patagonia IntaVetch, HairyLegume4A5.3A3.7A3.1D-H3.5BC4.3A3.5AB2.7C-F
Purple BountyVetch, HairyLegume4A4.7A-D3.4A-C3.9AB3F-H2.8H-K3.3B-D2.9BC
VillanaVetch, HairyLegume3.8A-C4.9A-C3.5AB3.1C-G3.5B4.4A3.9A2.4E-K
WinterKingVetch, HairyLegume3.9AB4.4C-E3.7A3.6BC3.4B-D4.1AB3.4A-C2.8CD
NamoiVetch, WoolypodLegume3.8A-C5.1AB3.1B-F3.3C-E3.3B-F3.9A-C2.9C-F2.9BC
Double OOWinter PeaLegume3.1G-I3.7FG3.1B-F2.6I-L2.8HI3.4C-G2.5E-K2.3F-L
SurvivorWinter PeaLegume3.2F-H4.1D-G3.1B-G2.6I-L3.1E-G3.7B-D2.9C-F2.7C-F
VNS (1)Winter PeaLegume3.3E-G4E-G3.3A-E2.5I-L2.9G-I3.9A-C2.9C-F2J-N
VNS (2)Winter PeaLegume3.6C-E4.8A-C3.1B-F2.8F-I3.4B-E3.6B-E3.5AB3BC
WindhamWinter PeaLegume3.6B-D4.2D-F3.3A-E3.4B-D3F-H3.6B-E2.7D-H2.6C-G
WyoWinter (1)Winter PeaLegume3.5D-F4.4C-E3.4A-D2.6G-K3.2C-F4.1AB3.4A-C2.2G-L
WyoWinter (2)Winter PeaLegume3.3D-G4.1D-F3.2B-F2.7F-J3.2D-G3.8A-C2.9C-F2.8C-E
Average3.14.12.92.933.22.72.5
Min1.62.91.61.7221.81.9
Max4.15.33.74.344.43.93.9
Range2.42.42.12.722.42.12

† 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).
‡ Analyzed using near infrared spectroscopy (NIRS) with the appropraite calibration for each species.
‖ Entries with missing values did not have enough biomass to grind and analyze using NIRS.

 

Table 16-d. Summary statistics for location comparison of mean percent total nitrogen content‡ 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.

GroupTotal Nitrogen (%)      
Apr†May
Avg.RECMMTRECETRECAvg.RECMMTRECETREC
Brassicas
Average22.1222221
Min1.91.8221121
Max2.12.4222222
Range0.20.6110111
Cereals
Average1.51.6211111
Min1.21.3111110
Max1.92.2221111
Range0.80.9111111
Legumes
Average3.14.1333332
Min1.62.9222222
Max4.15.3444444
Range2.42.4232222
Across Groups
Average2.42.7222222
Standard Error0.10.3250123
Min1.21.3111110
Max4.15.3444444
Range2.94233433

‡ Analyzed using near infrared spectroscopy (NIRS) with the appropraite calibration for each species.

Virginia Sykes
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