Table 16. Early Nov. Planted, Across Location, Biomass and Weed Suppression

Table 16. Across location mean biomass and weed suppression of 18 cover crop varieties and 8 mixes planted in early Nov. 2020, in small plot replicated trials, at two University of Tennessee AgResearch and Education Center locations, in 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 RyeCereal1.0A2.0A1956A3935A51JK10I5F-H3C-E
ElbonCereal RyeCereal0.7C2.1A1367C4236A53JK13HI3GH2D-F
NF95319BCereal RyeCereal0.9AB2.0A1832AB4069A45K11I3GH3C-E
NF97325Cereal RyeCereal0.7C1.8A-E1401C3536A-E61IJ14HI6E-H4CD
NF99362Cereal RyeCereal0.8BC1.9AB1599BC3800AB47K11I3GH3CD
YankeeCereal RyeCereal0.3F-H1.2F-H635F-H2464F-H48K18G-I12DE5CD
TN1902WheatCereal0.4EF1.4D-G891EF2877D-G68HI19G-I4F-H5CD
Legumes
ParadanaClover, BalansaLegume0.1I0.3J227I651J100A99A57A54A
TaipanClover, BalansaLegume0.1I0.4J259I729J100A100A57A57A
ViperClover, BalansaLegume0.1I0.5IJ191I1001IJ100A100A54AB56A
LightningClover, BerseemLegume0.1I0.4J214I740J100A99A48B33A
DixieClover, CrimsonLegume0.2I0.9HI316I1730HI77E-H89AB15CD12B
AU MeritVetch, HairyLegume0.4EF1.1F-H734EF2289F-H85C-F76BC9D-G2D-F
PatagoniaVetch, HairyLegume0.5DE1.2F-H998DE2472F-H87B-E59DE3GH0F
WinterKingVetch, HairyLegume0.4E-G1.3FG708E-G2558FG96AB95A7E-H1EF
Brassicas
VivantHybrid (turnip x rapeseed)Brassica0.2HI0.3J334HI698J74F-H56DE53AB51A
AerifiRadishBrassica0.2G-I0.3J410G-I630J72GH55DE54AB53A
Jackpot TurnipBrassica0.2I0.4J311I716J77F-H65CD56A50A
Mixes
Bates RS4 (20%) + Dixie (80%)Cereal Rye + Crimson CloverMix0.6CD1.5C-G1299CD2980C-G75F-H17HI8E-H4C
Bates RS4 (20%) + AU Merit (80%)Cereal Rye +
Hairy Vetch
Mix0.8C1.5B-F1508C3076B-F82D-G25G-I3H0F
Bates RS4 (10%) + Dixie (90%)Cereal Rye + Crimson CloverMix0.6CD1.8A-C1299CD3685A-C74F-H29F-H8E-H4C-E
Bates RS4 (10%) + AU Merit (90%)Cereal Rye +
Hairy Vetch
Mix0.7C1.8A-D1310C3653A-D88B-D33FG4F-H0F
Yankee (20%) +
Dixie (80%)
Cereal Rye + Crimson CloverMix0.4E-G1.4E-G715E-G2843E-G77F-H24G-I12DE4C
Yankee (20%) +
AU Merit (80%)
Cereal Rye +
Hairy Vetch
Mix0.4EF1.5B-F742EF3029B-F82D-G33FG5F-H0F
TN1902 (20%) +
Dixie (80%)
Wheat +
Crimson Clover
Mix0.4EF1.1GH759EF2198GH91A-D53DE21C6BC
TN1902 (20%) +
AU Merit (80%)
Wheat +
Hairy Vetch
Mix0.4EF1.4E-G814EF2804E-G95A-C45EF10D-F0F
Cereals
Average0.71.813833559531453
Min0.31.26352464451032
Max1.02.1195642366819125
Range0.70.91321177223983
Legumes
Average0.20.8456152193903127
Min0.10.3191651775930
Max0.51.399825581001005757
Range0.41.0807190823415357
Brassicas
Average0.20.335268174595451
Min0.20.331163072555350
Max0.20.441071677655653
Range0.00.0998651033
Mixes
Average0.51.510563033833292
Min0.41.17152198741730
Max0.81.8150836859553216
Range0.40.779314872137186
Across Groups
Average0.41.2878243877482016
Standard Error0.30.6533121117332222
Min0.10.3191630451030
Max1.02.1195642361001005757
Range0.91.81765360654905457
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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