Table 20. Early Nov. Planted, Knoxville, TN, Biomass and Weed Suppression

Table 20. By location mean biomass and weed suppression of 36 cover crop varieties and 8 mixes planted in early Nov. 2020, in small plot replicated trials, at the East Tennessee AgResearch and Education Center, in Knoxville, Tennessee, and evaluated from Fall 2020 to Spring 2021.

VarietyCommon NameGroupBiomass (DM ton/ac)   Biomass (DM lb/ac)   Weed Proportion (%)       
AprMayAprMayDec‡Feb‡Apr‡May
Cereals
Bates RS4Cereal RyeCereal1.2A2.3A-C2497A4589A-C40KL9EF3D-F2DE
ElbonCereal RyeCereal0.7DE2.5A1437DE4955A40KL9EF0F2DE
NF95319BCereal RyeCereal1.1AB2.2A-D2300AB4500A-D34L8EF0F2DE
NF97325Cereal RyeCereal0.9CD1.8B-G1751CD3685B-G51H-K13D-F3D-F5CD
NF99362Cereal RyeCereal1.0BC2.3A-D1986BC4547A-D41J-L7F0F3D
YankeeCereal RyeCereal0.3H-L1.6E-H549H-L3104E-H43J-L19D-F7C-F2DE
TN1902WheatCereal0.5EF2.1A-E1071EF4197A-E48I-L13D-F0F2DE
Legumes
ParadanaClover, BalansaLegume0.1K-M0.5J240K-M1098J99AB98A18A35AB
TaipanClover, BalansaLegume0.1K-M0.5J251K-M977J99A100A17AB43A
ViperClover, BalansaLegume0.1K-M0.7J167K-M1369J99AB100A15A-C25AB
LightningClover, BerseemLegume0.1LM0.4J141LM826J99AB98A12A-D27AB
DixieClover, CrimsonLegume0.0M0.8IJ94M1662IJ55G-J82AB13A-C12BC
AU MeritVetch, HairyLegume0.4F-H1.4GH836F-H2796GH73C-E63BC2EF2DE
PatagoniaVetch, HairyLegume0.5E-G1.3HI1019E-G2524HI78CD65BC0F0E
WinterKingVetch, HairyLegume0.3G-K1.6E-H601G-K3151E-H97AB95A3D-F0E
Brassicas
VivantHybrid (turnip x rapeseed)Brassica0.2I-M0.5J392I-M1077J55G-J18D-F8B-F20AB
AerifiRadishBrassica0.3G-K0.6J601G-K1155J47I-L11D-F10A-E12BC
Jackpot TurnipBrassica0.1J-M0.5J277J-M1071J53H-K31DE17AB12BC
Mixes
Bates RS4 (20%) + Dixie (80%)Cereal Rye + Crimson CloverMix0.9CD1.7D-H1730CD3420D-H64D-H13D-F3D-F3D
Bates RS4 (20%) + AU Merit (80%)Cereal Rye +
Hairy Vetch
Mix1.0BC1.8B-H1996BC3581B-H68D-G8EF0F0E
Bates RS4 (10%) + Dixie (90%)Cereal Rye + Crimson CloverMix0.8CD2.3AB1568CD4698AB58F-I33D3D-F7CD
Bates RS4 (10%) + AU Merit (90%)Cereal Rye +
Hairy Vetch
Mix0.9CD2.3A-D1712CD4568A-D86A-C21D-F0F0E
Yankee (20%) +
Dixie (80%)
Cereal Rye + Crimson CloverMix0.4F-J1.8C-H713F-J3528C-H60E-I12D-F3D-F3D
Yankee (20%) +
AU Merit (80%)
Cereal Rye +
Hairy Vetch
Mix0.4F-H2.0A-F883F-H3941A-F73C-F18D-F0F0E
TN1902 (20%) +
Dixie (80%)
Wheat +
Crimson Clover
Mix0.4F-I1.5F-H776F-I3052F-H84BC57C7C-F3D
TN1902 (20%) +
AU Merit (80%)
Wheat +
Hairy Vetch
Mix0.5F-H1.9B-G949F-H3779B-G95AB30D-F2EF0E
Cereals
Average0.82.116564225431122
Min0.31.6549310434702
Max1.22.524974955511975
Range1.00.919481850171273
Legumes
Average0.20.9419180087881018
Min0.00.494826556300
Max0.51.610193151991001843
Range0.51.2925232644381843
Brassicas
Average0.20.6423110152201214
Min0.10.527710714711812
Max0.30.6601115555311720
Range0.20.03248482088
Mixes
Average0.61.912913821742422
Min0.41.5713305258800
Max1.02.319964698955777
Range0.60.812831646374877
Across Groups
Average0.51.510212994674068
Standard Error0.40.772113932235612
Min0.00.49482634700
Max1.22.524974955991001843
Range1.22.12403412965931843
ANOVA p-values
– Variety<0.001<0.001<0.001<0.001<0.001<0.001<0.001<0.001
– Location<0.001N.S.<0.001N.S.<0.001<0.001<0.001<0.001
– Variety x Location<0.001<0.001<0.001<0.0010.025<0.001<0.001<0.001

† Varieties that have any MS letter in common are not significantly different (Fisher’s Protected LSD, P<0.05). Mean separation letters are highlighted in dark orange for values that are not statistically different from the highest value across all entries within a given trait. Mean values between the 50th and 75th percentile are highlighted in light orange, mean values above the 75th percentile are highlighted in dark orange. § For analysis, values transformed using (value)^2 due to non-normal distribution. Untransformed means and summary statistics are reported. ‡ For analysis, values transformed using log (value+1) due to non-normal distribution. Untransformed means and summary statistics are reported. ‡‡ Non-normal distribution, means reported ¶ Analyzed using near infrared spectroscopy (NIRS) with the appropriate calibration for each species. Reported on a 100% DM basis. †† Estimated using quality constituents from NIRS inputted into the UGA cover crop nitrogen calculator.

Virginia Sykes
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