Table 26. Early Nov. Planted, Spring Hill, TN, Nitrogen Content and Release

Table 26. By location mean nitrogen content and estimated nitrogen release 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 NameTotal Nitrogen¶ (%)   Estimated N Released†† Apr. Term. (lbs/ac)     Estimated N Released†† MayTerm. (lbs/ac)     
AprMay2 wks4 wks12 wks2 wks4 wks12 wks
Cereals
Bates RS4Cereal Rye1.3L0.8K2G-J4G-I7F-K2H-J3H-J6I-K
ElbonCereal Rye1.6I-L0.8K3F-J5F-I8E-K3H-J6G-J10H-K
NF95319BCereal Rye1.4J-L0.9JK2H-J4G-I6G-K1IJ2IJ5I-K
NF97325Cereal Rye1.4KL0.9K3F-I6E-I8E-K1IJ3H-J5I-K
NF99362Cereal Rye1.3L0.9JK2H-J4G-I6G-K2H-J4H-J7I-K
YankeeCereal Rye2.0G-J1.3IJ3F-J5F-I8F-K4G-J6H-J9H-K
TN1902Wheat2.0G-J1.3IJ3F-J5F-I7F-K5G-J7G-J11H-K
Legumes
ParadanaClover, Balansa2.9A-E2.5EF1IJ2I3JK2H-J2IJ3JK
TaipanClover, Balansa2.2F-H2.6E1IJ2I3JK3H-J5H-J7I-K
ViperClover, Balansa2.7C-F2.7DE1IJ2I3JK4G-J5H-J7I-K
LightningClover, Berseem3.1A-C3.3C2IJ3HI5H-K7F-J11F-J15G-K
DixieClover, Crimson2.7C-F3.2CD4E-H7D-H11D-I17B-E26B-E34C-F
AU MeritVetch, Hairy3.3AB4.7A8BC12B18BC25AB38AB50A-C
PatagoniaVetch, Hairy3.2A-C4.7A10AB17A25A27AB41AB54AB
WinterKingVetch, Hairy3.3A4.7A11A18A26A33A49A65A
Brassicas
VivantHybrid (turnip x rapeseed)2.3D-H2.1FG2H-J3I4JK2H-J3H-J4JK
AerifiRadish2.4D-G2.0GH1J2I2K0J1J1K
Jackpot Turnip2.4D-H2.0GH2IJ3I5I-K2H-J4H-J5I-K
Mixes
Bates RS4 (20%) + Dixie (80%)Cereal Rye + Crimson Clover1.9H-K1.6HI3F-I6E-I9D-J11D-H16D-H22E-I
Bates RS4 (20%) + AU Merit (80%)Cereal Rye +
Hairy Vetch
2.3E-H3.2C7CD12BC17B19B-D29B-D39B-E
Bates RS4 (10%) + Dixie (90%)Cereal Rye + Crimson Clover2.0G-I1.9GH5D-G8C-G12B-G15C-F24C-F32D-G
Bates RS4 (10%) + AU Merit (90%)Cereal Rye +
Hairy Vetch
2.1G-I3.4C6C-E10B-E14B-E23BC36A-C47B-D
Yankee (20%) +
Dixie (80%)
Cereal Rye + Crimson Clover2.3F-H2.0G4E-H8C-G11C-H13D-G20D-G26E-H
Yankee (20%) +
AU Merit (80%)
Cereal Rye +
Hairy Vetch
3.0A-C3.9B5C-F9B-F12B-F18B-E28B-E36B-F
TN1902 (20%) +
Dixie (80%)
Wheat +
Crimson Clover
2.3F-H2.0G5C-F9B-F12B-F10E-I15E-I20F-J
TN1902 (20%) +
AU Merit (80%)
Wheat +
Hairy Vetch
2.8B-D3.5BC6C-E10B-D15B-D20B-D30B-D40B-E
Cereals
Average1.61.0357347
Min1.30.8246125
Max2.01.33685711
Range0.70.5123456
Legumes
Average2.93.55812152229
Min2.22.5123223
Max3.34.7111826334965
Range1.22.2101724314762
Brassicas
Average2.42.0134123
Min2.32.0122011
Max2.42.1235245
Range0.10.1112233
Mixes
Average2.32.75913162533
Min1.91.6369101520
Max3.03.971217233647
Range1.02.3469132127
Across Groups
Average2.32.44710101622
Standard Error0.61.2346101419
Min1.30.8122011
Max3.34.7111826334965
Range2.03.9101724324964
ANOVA p-values
– Variety<0.001<0.001<0.001<0.001<0.001<0.001<0.001<0.001
– Location<0.001<0.001<0.001<0.001<0.001<0.001<0.001<0.001
– Variety x Location0.0170.008N.S.N.S.N.S.N.S.N.S.N.S.
† 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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