Knoxville mean biomass, nitrogen content, and nitrogen release

Table 11-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 East Tennessee AgResearch and Education Center in Knoxville, 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-P2.1L-O1.7M-O11101217
ExtenderHyb. BrassicaBrassica0.5M-T1.3F-O1.6O-U1.4O-Q004004
VivaHyb. BrassicaBrassica0.8I-Q1.7C-L1.9M-Q1.2P-U019006
VivantHyb. BrassicaBrassica0.3Q-T0.7K-P2.2K-N1.6N-P015017
AerifiRadishBrassica0.8J-R1.8B-K1.6O-U1.3O-S0160010
DiggerRadishBrassica0.7K-R2.1B-I1.9M-Q1.4O-Q0180115
DrillerRadishBrassica0.4N-T1.8B-K1.7N-R1.4O-R0040113
SERALPHARadishBrassica0.9H-P2.6B-D1.8N-R1.4O-Q0190120
SERWF19RadishBrassica1F-N2B-I1.7N-S1.1Q-V018006
SmartRadishBrassica1.1E-L2.2B-H1.6O-T1.3O-S0180112
Jackpot TurnipBrassica0.7K-S1.3F-O2M-P1.3O-Q018007
Average0.71.71.81.40170111
Min0.30.71.61.1004004
Max1.12.62.21.711101220
Range0.81.90.60.51161216

† 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 11-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 East Tennessee AgResearch and Education Center in Knoxville, 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 RyegrassCereal0.3P-T0.7K-P1.5P-V1.1Q-V003004
LowboyAnnual RyegrassCereal0.1T0.2OP1.7N-R1.3O-T001002
140760BarleyCereal0.7K-R2B-I1.1V-X0.8U-W0010-1-2
140789BarleyCereal1.1E-L2.2B-I1.2S-X0.9R-W004001
140797BarleyCereal0.7J-R1.7B-L1.2T-X0.9R-W002000
SB255BarleyCereal0.6L-T1.2G-P1.4Q-W0.9S-W003001
SecretariatBarleyCereal0.8I-R1.7C-M1.5Q-V0.8T-W0050-1-1
Bates RS4Cereal RyeCereal2.1A3.9A1WX0.5W00-100-9
Elbon (1)Cereal RyeCereal1.5B-G2.9AB1.2S-X0.5W00200-8
Elbon (2)Cereal RyeCereal1E-M2.1B-I1.3R-X0.7W00300-4
GokuCereal RyeCereal1.2D-K2.3B-H1V-X0.6W00000-6
NF95319BCereal RyeCereal1.7A-D2.7B-D0.9X0.5W00-100-8
NF97325Cereal RyeCereal2AB2.3B-H0.9X0.5W00-200-8
NF99362Cereal RyeCereal1.5A-F2.6B-E0.9X0.5W00-100-8
Wintergrazer 70Cereal RyeCereal1.3D-J2.1B-I1V-X0.7W00000-5
YankeeCereal RyeCereal0.7J-R1.9B-I1.5P-V0.9S-W00400-1
BobOatCereal1.1E-M2.5B-F1.1V-X0.7VW0030-1-6
CosaqueOatCereal0.9G-O2B-I1.1U-X0.8U-W0020-1-1
HilliardWheatCereal1.2D-K2.3B-H1.2R-X0.7VW0040-1-6
Liberty 5658WheatCereal0.6L-T1.6D-M1.1V-X0.7VW0010-1-4
Average1.121.20.800200-3
Min0.10.20.90.500-20-1-9
Max2.13.91.71.3005004
Range23.70.90.80070113

† 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 11-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 East Tennessee AgResearch and Education Center in Knoxville, 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, BalansaLegume0.3Q-T1.2G-P3.1C-G2.4E-J0192433
ParadanaClover, BalansaLegume0.2R-T0.5M-P2.3J-M2.1I-M0151111
ViperClover, BalansaLegume0.6L-T2.6B-E3.1D-H2.4D-I12184866
BaladyClover, BerseemLegume0.1T0.1P1.7O-T2.7C-F001003
FrostyClover, BerseemLegume0.1ST0.3N-P2.6G-K2.3F-L002118
AU SunriseClover, CrimsonLegume0.7J-R1.7C-L2.8F-J2L-N12181328
BolsenaClover, CrimsonLegume0.6L-T1.7B-L2.9D-I2I-M12152331
DixieClover, CrimsonLegume0.8J-R1.2G-P2.6G-K2I-N12171321
Kentucky PrideClover, CrimsonLegume0.2Q-T1I-P2.6H-K2.2H-L0161322
SECCM18Clover, CrimsonLegume0.9G-O2.3B-G2.7G-J2K-N13222439
White CloudClover, CrimsonLegume0.4O-T1.1H-P2.5I-L1.9L-N0181219
Big RedClover, RedLegume0.1ST0.6L-P2.7G-J2.6C-H0021216
BlazeClover, RedLegume0.1T0.3N-P2.7G-K2.7C-E0021110
GA9909Clover, RedLegume0.2R-T1.2G-P2.8E-I3.3B0163642
VNSClover, RedLegume0.1T0.4N-P2.3J-M2.6C-H0011111
VNSVetch, CommonLegume1F-N3A-C3.2C-F2.2G-L23274979
AU MeritVetch, HairyLegume1.9A-C2.5B-F4.3A3.9A497061399
Patagonia IntaVetch, HairyLegume1.4B-H2.2B-H3.1D-H2.7C-F25353751
Purple BountyVetch, HairyLegume0.9G-O1.9B-I3.9AB2.9BC24333754
VillanaVetch, HairyLegume0.6L-T1.6D-M3.1C-G2.4E-K12162536
WinterKingVetch, HairyLegume1.6A-E1.6D-M3.6BC2.8CD36483644
NamoiVetch, WoolypodLegume1.4C-I1.8B-K3.3C-E2.9BC25363646
Double OOWinter PeaLegume1F-N1.8B-K2.6I-L2.3F-L13202542
SurvivorWinter PeaLegume1G-N2.1B-I2.6I-L2.7C-F13204859
VNS (1)Winter PeaLegume0.6L-T1.9B-J2.5I-L2J-N12122437
VNS (2)Winter PeaLegume0.9H-P2.1B-I2.8F-I3BC13204860
WindhamWinter PeaLegume0.7K-S1.7B-L3.4B-D2.6C-G13203648
WyoWinter (1)Winter PeaLegume0.7K-S2B-I2.6G-K2.2G-L12142542
WyoWinter (2)Winter PeaLegume0.5M-T1.4E-N2.7F-J2.8C-E12152539
Average0.71.52.92.512182538
Min0.10.11.71.9001003
Max1.934.33.9497061399
Range1.82.92.72496961396

† 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 11-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 East Tennessee AgResearch and Education Center in Knoxville, 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
Average0.71.71.81.40170111
Min0.30.71.61.1004004
Max1.12.62.21.711101220
Range0.81.90.60.51161216
Cereals
Average1.121.20.800200-3
Min0.10.20.90.500-20-1-9
Max2.13.91.71.3005004
Range23.70.90.80070113
Legumes
Average0.71.52.92.512182538
Min0.10.11.71.9001003
Max1.934.33.9497061399
Range1.82.92.72496961396
Across Groups
Average0.81.72.11.701111219
Standard Error0.10.30.10.1002003
Min0.10.10.90.500-20-1-9
Max2.13.94.33.9497061399
Range23.83.43.54972614108

‡ 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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