Table 24. Early Nov. Planted, Spring Hill, TN, Biomass and Weed Suppression

Table 24. 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 Middle Tennessee AgResearch and Education Center, in Spring Hill, 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 RyeCereal0.7A1.6A-C1415A3282A-C63BC11H7G3DE
ElbonCereal RyeCereal0.6AB1.8AB1296AB3517AB66BC18GH7G2EF
NF95319BCereal RyeCereal0.7A1.8A1364A3638A57BC14GH7G3DE
NF97325Cereal RyeCereal0.5A-D1.7AB1051A-D3387AB71B15GH8FG3DE
NF99362Cereal RyeCereal0.6A-C1.5A-D1213A-C3052A-D53C15GH7G3DE
YankeeCereal RyeCereal0.4D-G0.9E-G721D-G1824E-G52C18GH17D-F8CD
TN1902WheatCereal0.4D-H0.8F-I711D-H1557F-I88A25E-H8FG8CD
Legumes
ParadanaClover, BalansaLegume0.1J0.1K214J204K100A100A95A73A
TaipanClover, BalansaLegume0.1IJ0.2I-K267IJ481I-K100A100A97A70A
ViperClover, BalansaLegume0.1J0.3I-K214J632I-K100A100A93AB87A
LightningClover, BerseemLegume0.1G-J0.3H-K287G-J653H-K100A100A85B38AB
DixieClover, CrimsonLegume0.3E-J0.9E-G538E-J1798E-G99A96A17D-F12BC
AU MeritVetch, HairyLegume0.3D-J0.9E-H632D-J1782E-H96A90A17D-F2EF
PatagoniaVetch, HairyLegume0.5A-E1.2B-G977A-E2420B-G96A53BC7G0F
WinterKingVetch, HairyLegume0.4C-E1.0D-G815C-E1965D-G95A95A10E-G2EF
Brassicas
VivantHybrid (turnip x rapeseed)Brassica0.1H-J0.2JK277H-J319JK93A95A97A82A
AerifiRadishBrassica0.1J0.1K220J105K98A98A98A95A
Jackpot TurnipBrassica0.2F-J0.2JK345F-J361JK100A99A95A88A
Mixes
Bates RS4 (20%) + Dixie (80%)Cereal Rye + Crimson CloverMix0.4B-E1.3A-F868B-E2540A-F86A21F-H12D-G5CD
Bates RS4 (20%) + AU Merit (80%)Cereal Rye +
Hairy Vetch
Mix0.5A-D1.3A-F1019A-D2571A-F95A41B-F5G0F
Bates RS4 (10%) + Dixie (90%)Cereal Rye + Crimson CloverMix0.5A-D1.3A-F1030A-D2671A-F90A26D-H13D-G2EF
Bates RS4 (10%) + AU Merit (90%)Cereal Rye +
Hairy Vetch
Mix0.5B-E1.4A-E909B-E2739A-E90A46B-E8FG0F
Yankee (20%) +
Dixie (80%)
Cereal Rye + Crimson CloverMix0.4D-H1.1C-G716D-H2158C-G93A37C-G20D5CD
Yankee (20%) +
AU Merit (80%)
Cereal Rye +
Hairy Vetch
Mix0.3D-J1.1D-G601D-J2117D-G92A48B-D10E-G0F
TN1902 (20%) +
Dixie (80%)
Wheat +
Crimson Clover
Mix0.4D-F0.7G-J742D-F1343G-J98A50BC35C8CD
TN1902 (20%) +
AU Merit (80%)
Wheat +
Hairy Vetch
Mix0.3D-I0.9E-G679D-I1829E-G95A60B18DE0F
Cereals
Average0.61.411102894641695
Min0.40.87111557521172
Max0.71.8141536388825178
Range0.41.070420803614107
Legumes
Average0.20.6493124298925335
Min0.10.1214204955370
Max0.51.297724201001009787
Range0.41.176322165479087
Brassicas
Average0.10.128026197989788
Min0.10.122010593959582
Max0.20.2345361100999895
Range0.10.112525674313
Mixes
Average0.41.182122469241153
Min0.30.76011343862150
Max0.51.4103027399860358
Range0.20.742913951339308
Across Groups
Average0.40.9735188287573423
Standard Error0.20.5371110016353834
Min0.10.1214105521150
Max0.71.8141536381001009895
Range0.61.81201353348899395
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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