Across location mean biomass, nitrogen content, and nitrogen release

Table 8-a. Across location mean biomass, percent total nitrogen content‡, and 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.

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
ImpactCollardsBrassica0.3Q-V0.7X-BB2Q-S1.9N-Q0.30.74.70.71.310.3
ExtenderHyb. BrassicaBrassica0.4M-S0.6Y-BB1.9S-W1.6P-S0.30.3400.35.3
VivaHyb. BrassicaBrassica0.4L-S0.9U-AA1.9S-W1.6Q-S00.74.700.35
VivantHyb. BrassicaBrassica0.2S-V0.4AA-BB2Q-T1.9M-P00.7300.76
AerifiRadishBrassica0.5J-P1.2P-W1.9ST1.6P-R0.3160.30.710.3
DiggerRadishBrassica0.4L-S1.2Q-X2.1P-S1.8O-Q0.30.75.30110.7
DrillerRadishBrassica0.3P-U1T-Z2Q-S1.8O-R0.30.740.30.79.3
SERALPHARadishBrassica0.5K-Q1.3L-U1.9S-U1.7P-R0.31600.711
SERWF19RadishBrassica0.6G-M1.3M-U2Q-S1.6P-S0.317.300.77.7
SmartRadishBrassica0.5J-P1.2Q-X1.9R-T1.5RS0.30.7500.77.3
Jackpot TurnipBrassica0.3P-U0.8V-BB2R-T1.6P-S00.7400.35.3
Average0.4121.70.20.74.90.10.78
Min0.20.41.91.500.3300.35
Max0.61.32.11.90.317.30.71.311
Range0.40.90.20.40.30.74.30.716

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

 

Table 8-b. Across location mean biomass, percent total nitrogen content‡, and 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.

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 RyegrassCereal0.3Q-V1S-Z1.5X-AA1TU002.3003.3
LowboyAnnual RyegrassCereal0.1V0.4AA-BB1.9ST1.3ST000.7002.7
140760BarleyCereal0.4L-S1.4I-U1.5X-B0.9U-Y001.70-0.3-0.7
140789BarleyCereal0.5K-Q1.4K-U1.6W-Z1U-W002.3001.3
140797BarleyCereal0.4M-S1.2O-W1.6U-Y1UV002001
SB255BarleyCereal0.4M-S1.3N-V1.6V-Z1U-X002.7001.3
SecretariatBarleyCereal0.4L-R1.4H-T1.7T-X1U-W003.30-0.31.7
Bates RS4Cereal RyeCereal1.2AB2.3AB1.2AA-CC0.6Y000.700-6
Elbon (1)Cereal RyeCereal0.8D-H1.9A-H1.4X-C0.6Y00200-5
Elbon (2)Cereal RyeCereal0.6G-M1.6E-Q1.6U-Y0.8U-Y00.7300-2.3
GokuCereal RyeCereal0.7F-K1.8B-M1.4Y-C0.8V-Y001.300-3.7
NF95319BCereal RyeCereal1.1AB2.1A-E1.2AA-CC0.7XY00100-5
NF97325Cereal RyeCereal1.1A-C1.9A-H1.2AA-CC0.6Y000.300-5.7
NF99362Cereal RyeCereal1B-E1.9A-I1.2AA-CC0.6Y00100-5
Wintergrazer 70Cereal RyeCereal0.9B-F1.9B-K1.3AA-CC0.7W-Y00100-4.3
YankeeCereal RyeCereal0.3P-U1.3N-V1.9S-V1T-V002.7000.3
BobOatCereal0.6G-O1.7D-P1.4X-CC0.9U-Y002.70-0.7-1.7
CosaqueOatCereal0.6H-P1.5F-R1.4Y-CC0.8U-Y002.30-0.70
HilliardWheatCereal0.7G-L1.8B-L1.4X-CC0.8U-Y0030-0.7-2
Liberty 5658WheatCereal0.5I-P1.4J-U1.3Z-CC0.9U-Y0020-0.3-1.3
Average0.61.61.50.9001.90-0.2-1.6
Min0.10.41.20.6000.30-0.7-6
Max1.22.31.91.300.73.3003.3
Range1.11.90.80.700.7300.79.3

† 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 8-c. Across location mean biomass, percent total nitrogen content‡, and 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.

 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
CC19048FIXatioNClover, BalansaLegume0.3O-T1.2Q-W3.3E-G2.6IJ0.72122536.7
CC19049ParadanaClover, BalansaLegume0.2R-V0.7W-BB2.6L-N2.1K-N00.74.71215.3
CC19050ViperClover, BalansaLegume0.4M-S1.8D-O3.1G-J2.4JK1213.72.75.745
CC19051BaladyClover, BerseemLegume0V0.3AA-BB1.6U-Y2.2KL000.50.30.76.7
CC19052FrostyClover, BerseemLegume0.2R-V1.1R-Y3H-K2.7IJ0.30.7524.332
CC19053AU SunriseClover, CrimsonLegume0.5K-Q1.7D-O2.7LM2.1K-N0.71.7111.74.332.7
CC19061BolsenaClover, CrimsonLegume0.5J-Q1.6E-R2.9I-L2.1K-N1212.71.73.730.3
CC19054DixieClover, CrimsonLegume0.5K-Q1.6E-Q2.8K-M2.2KL0.71.7121.74.733.3
CC19055Kentucky PrideClover, CrimsonLegume0.3O-T1.5F-S2.8KL2.2KL0.31.38.71.74.332.3
CC19056SECCM18Clover, CrimsonLegume0.5I-P2A-F2.8J-L2.2K-M0.721324.736.7
CC19063White CloudClover, CrimsonLegume0.3N-T1.2P-W2.7K-M2L-O0.31.381.32.722.7
CC19060Big RedClover, RedLegume0.1UV0.6Z-BB2.3O-Q2.6IJ001.30.7216.3
CC19057BlazeClover, RedLegume0.1V0.4AA-BB2.3N-P2.9G-I000.71214
CC19058GA9909Clover, RedLegume0.1T-V0.7W-BB2.5M-O3F-H00.321.33.324
CC19059VNSClover, RedLegume0.1T-V0.5Z-BB2.2O-R3F-H0011217
CC19019VNSVetch, CommonLegume0.6G-M2.2A-D3.3F-H2.7IJ1.3318.74970
CC19020AU MeritVetch, HairyLegume1.2A2.3A-C4.1A3.9A3744.35.312.391.7
CC19021Patagonia IntaVetch, HairyLegume1A-D1.9A-I4A3.5BC2.36.3373.78.362.7
CC19022Purple BountyVetch, HairyLegume0.8E-I1.9A-H4A3F-H24.32937.353.3
CC19018VillanaVetch, HairyLegume0.7G-L1.6E-R3.8A-C3.5B1.7425.33.38.361.7
CC19023WinterKingVetch, HairyLegume1.2AB1.8C-N3.9AB3.4B-D36.3403.78.361.7
CC19024NamoiVetch, WoolypodLegume0.8C-G1.5G-T3.8A-C3.3B-F1.74272.7646
CC19027Double OOWinter PeaLegume0.7G-L1.8B-K3.1G-I2.8HI1.33172.76.752
CC19028SurvivorWinter PeaLegume0.8D-I2.4A3.2F-H3.1E-G1.73.722.349.370
CC19025VNS (1)Winter PeaLegume0.7E-K1.9A-J3.3E-G2.9G-I1.33.721.33755.7
CC19026VNS (2)Winter PeaLegume0.7E-K2A-G3.6C-E3.4B-E1.3424.33.7966
CC19029WindhamWinter PeaLegume0.6G-N1.8C-N3.6B-D3F-H1.33.319.737.356.7
CC19030WyoWinter (1)Winter PeaLegume0.6G-M1.9A-H3.5D-F3.2C-F1.73.319.33.7966.3
CC19031WyoWinter (2)Winter PeaLegume0.8E-J1.9A-H3.3D-G3.2D-G1.7424.73.3859.3
Average0.51.53.12.81.12.616.42.45.843.7
Min00.31.62000.50.30.76.7
Max1.22.44.13.93744.35.312.391.7
Range1.222.41.93743.8511.785

† 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 8-d. Summary statistics and ANOVA p-values for across location mean biomass, percent total nitrogen content‡, and 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.

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
Average0.4121.7015018
Min0.20.41.91.5003005
Max0.61.32.11.90171111
Range0.40.90.20.4014116
Cereals
Average0.61.61.50.900200-2
Min0.10.41.20.60000-1-6
Max1.22.31.91.3013003
Range1.11.90.80.7013019
Legumes
Average0.51.53.12.813162644
Min00.31.62001017
Max1.22.44.13.9374451292
Range1.222.41.9374451285
Across Groups
Average0.51.42.41.91191322
Standard Error0.10.10.10.1001003
Min00.31.20.60000-1-6
Max1.22.44.13.9374451292
Range1.222.93.3374451398

‡ 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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