Spring Hill mean biomass, nitrogen content, and nitrogen release

Table 10-a. By location mean biomass, percent total nitrogen content‡, and estimated nitrogen release§ of 60 cover crop varieties evaluated in small plot replicated trials at the University of Tennessee Middle Tennessee AgResearch and Education Center at Spring HIll, TN during 2019-2020.

VarietyCommon NameGroupBiomass
(DM tons/ac)
  Total Nitrogen
(%)
  Estimated N Released:
Apr. Term. (lbs/ac)
 Estimated N Released:
May. Term. (lbs/ac)
 
Apr†MayAprMay2 wks.4 wks.12 wks.2 wks.4 wks.12 wks.
Brassicas
ImpactCollardsBrassica0.6L-T0.7J-P1.8O-X1.8M-P001002
ExtenderHyb. BrassicaBrassica0.5M-T1.3F-O2N-U1.7O-Q000002
VivaHyb. BrassicaBrassica0TU0.2VW1.9N-V2L-O000003
VivantHyb. BrassicaBrassica0U0.2VW1.9N-W2L-O000003
AerifiRadishBrassica0.1R-U0.2U-W2.1L-R2K-O001014
DiggerRadishBrassica0TU0.2VW2.3J-N2.3G-M000014
DrillerRadishBrassica0U0.2VW2.1L-Q2.2I-O000003
SERALPHARadishBrassica0.1R-U0.1W1.7P-Y2.1J-O000002
SERWF19RadishBrassica0.1R-U0.2T-W1.9N-U2.2H-O001015
SmartRadishBrassica0U0.1W2M-S1.8M-P000002
Jackpot TurnipBrassica0.1S-U0.2VW1.8N-W1.9M-P000002
Average0.10.322000003
Min00.11.71.7000002
Max0.61.32.32.3001015
Range0.61.20.60.6001013

† 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.
§ Estimated using quality constituents from NIRS inputted into the UGA cover crop nitrogen calculator.

 

Table 10-b By location mean biomass, percent total nitrogen content‡, and estimated nitrogen release§ of 60 cover crop varieties evaluated in small plot replicated trials at the University of Tennessee Middle Tennessee AgResearch and Education Center at Spring HIll, TN during 2019-2020.

VarietyCommon NameGroupBiomass
(DM tons/ac)
  Total Nitrogen
(%)
  Estimated N Released:
Apr. Term. (lbs/ac)
 Estimated N Released:
May. Term. (lbs/ac)
 
Apr†MayAprMay2 wks.4 wks.12 wks.2 wks.4 wks.12 wks.
Cereals
CenturionAnnual RyegrassCereal0.1R-U0.7P-V1.7Q-Y1.2RS001004
LowboyAnnual RyegrassCereal0U0.3T-W1.9N-U1.4P-R000002
140760BarleyCereal0.2M-U0.9L-S1.9N-W1.1RS002002
140789BarleyCereal0.1R-U0.7O-U1.8N-W1.1RS001002
140797BarleyCereal0.1P-U1J-R2N-T1.2RS001005
SB255BarleyCereal0.2L-U1.1I-Q1.8O-X1.1RS002003
SecretariatBarleyCereal0.2M-U1.3G-N1.9N-W1.2RS002005
Bates RS4Cereal RyeCereal0.6A-H1.3G-M1.3Y0.7S00100-3
Elbon (1)Cereal RyeCereal0.3K-S1.2H-P1.5T-Y0.7S00100-3
Elbon (2)Cereal RyeCereal0.4E-M1.4F-M1.8O-X0.8S01300-2
GokuCereal RyeCereal0.4F-N1.5E-J1.5U-Y0.8S00200-2
NF95319BCereal RyeCereal0.7A-D1.7C-H1.3Y0.9S00200-1
NF97325Cereal RyeCereal0.5B-J1.6D-I1.3XY0.7S00100-4
NF99362Cereal RyeCereal0.5C-K1.3G-M1.4W-Y0.7S00200-3
Wintergrazer 70Cereal RyeCereal0.5E-K1.4F-L1.4V-Y0.7S00100-3
YankeeCereal RyeCereal0.1R-U0.8M-S2.1M-S1.2Q-S001002
BobOatCereal0.3K-S1J-R1.6R-Y1RS002003
CosaqueOatCereal0.2L-U0.9K-R1.7P-Y1.1RS002003
HilliardWheatCereal0.3I-Q1.2G-O1.6S-Y1RS002002
Liberty 5658WheatCereal0.5E-L1.1I-P1.4V-Y1.1RS002002
Average0.31.11.61002001
Min00.31.30.700000-4
Max0.71.72.11.4013005
Range0.71.40.80.8013009

† 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.
§ Estimated using quality constituents from NIRS inputted into the UGA cover crop nitrogen calculator.

 

Table 10-c. By location mean biomass, percent total nitrogen content‡, and estimated nitrogen release§ of 60 cover crop varieties evaluated in small plot replicated trials at the University of Tennessee Middle Tennessee AgResearch and Education Center at Spring HIll, TN during 2019-2020.

VarietyCommon NameGroupBiomass
(DM tons/ac)
  Total Nitrogen
(%)
  Estimated N Released:
Apr. Term. (lbs/ac)
 Estimated N Released:
May. Term. (lbs/ac)
 
Apr†MayAprMay2 wks.4 wks.12 wks.2 wks.4 wks.12 wks.
Legumes
FIXatioNClover, BalansaLegume0.2M-U0.9M-S2.8F-I2.6E-I0141427
ParadanaClover, BalansaLegume0.1N-U0.6Q-W2.5I-M2.2I-O0031212
ViperClover, BalansaLegume0.1O-U0.8N-T2.2K-O2.2I-O0021217
BaladyClover, BerseemLegume0U0.1W1.6R-Y1.8N-P000002
FrostyClover, BerseemLegume0.3J-R1.1I-P2.9E-I2.6E-I0162429
AU SunriseClover, CrimsonLegume0.5E-L2B-E2.6G-K2.3G-N1292642
BolsenaClover, CrimsonLegume0.6A-G2.2A-C2.7F-J2.1I-O12132541
DixieClover, CrimsonLegume0.6A-I2.1A-D3D-H2.3G-M12142644
Kentucky PrideClover, CrimsonLegume0.7A-C2.5AB3C-G2.3G-N13193755
SECCM18Clover, CrimsonLegume0.5B-I2A-D2.9E-I2.3G-N12132643
White CloudClover, CrimsonLegume0.4E-M1.9C-F2.9E-I2.2I-O12102539
Big RedClover, RedLegume0.1Q-U0.4S-W1.7P-Y2.4F-L000018
BlazeClover, RedLegume0U0.2VW2M-S2.6E-K000015
GA9909Clover, RedLegume0U0.3T-W2.1K-P3B-E000019
VNSClover, RedLegume0.2M-U0.5R-W2.2K-O2.8D-G0021215
VNSVetch, CommonLegume0.2N-U0.5R-W2.5H-L2.6E-J0131214
AU MeritVetch, HairyLegume0.5B-J2.5AB3.5AB3.5AB131551392
Patagonia IntaVetch, HairyLegume0.6A-E2A-E3.7A3.5AB142041075
Purple BountyVetch, HairyLegume0.6A-F2.2A-C3.4A-C3.3B-D131841072
VillanaVetch, HairyLegume0.6A-G1.4F-K3.5AB3.9A13183965
WinterKingVetch, HairyLegume0.8A2.1A-C3.7A3.4A-C252541074
NamoiVetch, WoolypodLegume0.6A-I1.2G-O3.1B-F2.9C-F12142537
Double OOWinter PeaLegume0.3H-P1.9C-F3.1B-F2.5E-K1292647
SurvivorWinter PeaLegume0.5D-K2.5A3.1B-G2.9C-F121341075
VNS (1)Winter PeaLegume0.8AB1.8C-G3.3A-E2.9C-F14223753
VNS (2)Winter PeaLegume0.3K-T1.6D-I3.1B-F3.5AB0173963
WindhamWinter PeaLegume0.5D-K1.7C-H3.3A-E2.7D-H13142647
WyoWinter (1)Winter PeaLegume0.3G-O1.5E-J3.4A-D3.4A-C12103856
WyoWinter (2)Winter PeaLegume0.6A-E2.5AB3.2B-F2.9C-F131841071
Average0.41.52.92.712102642
Min00.11.61.8000002
Max0.82.53.73.9252551392
Range0.82.42.12.1252551390

† 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.
§ Estimated using quality constituents from NIRS inputted into the UGA cover crop nitrogen calculator.

 

Table 10-d. Summary statistics and ANOVA p-values for by location mean biomass, percent total nitrogen content‡, and estimated nitrogen release§ of 60 cover crop varieties evaluated in small plot replicated trials at the University of Tennessee Middle Tennessee AgResearch and Education Center at Spring HIll, TN during 2019-2020.

GroupBiomass
(DM tons/ac)
Total Nitrogen
(%)
Estimated N Released:
Apr. Term. (lbs/ac)
 Estimated N Released:
May. Term. (lbs/ac)
 
Apr†MayAprMay2 wks.4 wks.12 wks.2 wks.4 wks.12 wks.
Brassicas
Average0.10.322000003
Min00.11.71.7000002
Max0.61.32.32.3001015
Range0.61.20.60.6001013
Cereals
Average0.31.11.61002001
Min00.31.30.700000-4
Max0.71.72.11.4013005
Range0.71.40.80.8013009
Legumes
Average0.41.52.92.712102642
Min00.11.61.8000002
Max0.82.53.73.9252551392
Range0.82.42.12.1252551390
Across Groups
Average0.31.12.320161321
Standard Error0.10.30.20.2001003
Min00.11.30.700000-4
Max0.82.53.73.9252551392
Range0.82.42.43.2252551396

‡ Analyzed using near infrared spectroscopy (NIRS) with the appropraite calibration for each species.
§ Estimated using quality constituents from NIRS inputted into the UGA cover crop nitrogen calculator.

 

Virginia Sykes
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