Table 10. Early Oct. Planted, Knoxville, TN, Nitrogen Content and Release

Table 10. By location mean nitrogen content and estimated nitrogen release of 36 cover crop varieties and 8 mixes planted in early Oct. 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 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 Rye1.3OP0.9O-R3L-N7J-M15G-K-2PQ-3P-3L-N
ElbonCereal Rye1.5M-P0.9O-R4K-N7J-M14H-K-1O-Q-1OP0L-N
NF95319BCereal Rye1.1P0.7R0N1M5K-3Q-6P-12N
NF97325Cereal Rye1.4N-P0.8P-R1MN4K-M9I-K-2O-Q-3OP-6MN
NF99362Cereal Rye1.5M-P0.8QR3L-N7J-M14G-K-3Q-4P-8MN
TriCal RayCereal Rye1.3OP0.8O-R1MN2LM8JK-2PQ-3P-3MN
YankeeCereal Rye2.1H-L1.2M-Q9H-L14G-K23E-J1N-Q2M-P6J-N
TriCal EXP 20T06Triticale1.4M-P1.2M-Q4K-N9I-M19F-K2N-Q4L-P11I-N
TriCal EXP 21T01Triticale1.5M-P1.3L-O5J-N11H-M20F-K3L-Q7I-P14I-M
TriCal Flex 719Triticale1.9J-M1.3L-P8H-M14G-L22E-K3M-Q5K-P9I-N
TriCal SurgeTriticale1.7L-O1.1N-R6J-N11H-M19G-K0O-Q1N-P4K-N
TN1902Wheat1.8K-N1.3L-O9H-L14G-K23E-J4K-Q9I-P17H-M
Legumes
FIXatioNClover, Balansa2.4F-I2.8E-H9H-L14G-K22F-K12G-O18F-O22F-L
ParadanaClover, Balansa2.6D-G2.7F-H7I-N12H-M18G-K6H-Q10G-P12H-N
TaipanClover, Balansa2.4E-I2.4HI7I-N12H-M18G-K4J-Q6I-P7I-N
ViperClover, Balansa2.2G-K2.6F-H9F-L16F-J24D-J9H-Q13G-P17G-M
FrostyClover, Berseem3.1A-C3.1C-F16B-G27B-F39B-E28A-C43A-C55A-C
LightningClover, Berseem2.9B-E3.1D-G18A-C30A-C44A-C20C-H31C-G40C-H
*UF_CC_17Clover, Crimson2.4F-J2.4HI6I-N11H-M16G-K5J-Q7I-P9I-N
DixieClover, Crimson2.4F-I2.5HI8H-M13G-L19F-K16C-L24C-K30C-J
Kentucky PrideClover, Crimson2.5E-H2.6GH10E-L16E-J24D-J17C-K25C-J32C-I
GO-PER-12Clover, Persian2.4F-I3.3B-D10E-L17D-J25D-J15D-M23D-L29D-K
DynamiteClover, Red2.8C-F3.4B-D9F-L15F-J23E-J15D-M23D-L29D-J
Q (FL24D)Clover, Red2.5E-H3.4B-D11D-K17D-J26D-I13E-N20E-M26E-K
*UF_WC_LateOcoeeClover, White2.3G-K3.8AB6I-N10H-M15G-K3M-Q4L-P5J-N
*UF_WC_ML17Clover, White2.2G-K3.6B-D6I-N10I-M15G-K6J-Q9I-P11I-N
AU MeritVetch, Hairy3.4A4.2A18A-D29A-C43A-C26A-D40A-D51A-D
PatagoniaVetch, Hairy3.3AB4.1A17A-E28B-D41B-D25B-F38A-E48A-E
WinterKingVetch, Hairy3.4A4.2A13B-I21B-H31C-G35AB52AB66AB
SurvivorWinter Pea3.0A-D3.6BC24A40A58A38A57A72A
Brassicas
VivantHybrid (turnip x rapeseed)2.2G-K1.6J-M7I-N13H-L19F-K5J-Q8I-P11I-N
AerifiRadish2.4F-I2.1IJ9F-L16F-J23E-J3L-Q5K-P6J-N
CCS-779Radish2.3F-K1.8J-L8H-M13H-L19F-K7I-Q11H-P15H-M
DrillerRadish2.3F-K2.0I-K9G-L15G-K22E-K2M-Q4L-P5J-N
FragiBlasterRadish2.2G-K1.5K-N12B-J20C-I30C-H4K-Q7J-P9I-N
Jackpot Turnip2.3F-K1.6K-N7I-N12H-M18G-K3M-Q5K-P7J-N
Mixes
Bates RS4 (20%) + Dixie (80%)Cereal Rye + Crimson Clover2.0I-L1.7J-L16B-F29A-C45A-C17C-K29C-H42B-G
Bates RS4 (20%) + AU Merit (80%)Cereal Rye +
Hairy Vetch
2.2G-K2.4HI17A-D32AB49AB26A-E40A-D53A-D
Bates RS4 (10%) + Dixie (90%)Cereal Rye + Crimson Clover2.1H-L1.7J-L12C-J20C-I31C-H11H-P19E-N29D-K
Bates RS4 (10%) + AU Merit (90%)Cereal Rye +
Hairy Vetch
2.5E-H2.6H19AB29A-C43A-C28A-D42A-D54A-C
Yankee (20%) +
Dixie (80%)
Cereal Rye + Crimson Clover2.4F-I2.1IJ9H-L14G-K21F-K19C-I29C-H39C-H
Yankee (20%) +
AU Merit (80%)
Cereal Rye +
Hairy Vetch
2.8C-F2.8F-H12B-J20C-I30C-H24B-G35B-F46B-F
TN1902 (20%) +
Dixie (80%)
Wheat +
Crimson Clover
2.4F-I1.8JK17B-E27B-E41B-D13F-N20E-M28D-K
TN1902 (20%) +
AU Merit (80%)
Wheat +
Hairy Vetch
3.2A-C3.3C-E15B-H24B-G36B-F17C-J26C-I34C-I
Cereals
Average1.51.04916012
Min1.10.7015-3-6-12
Max2.11.3914234917
Range1.00.78131871529
Legumes
Average2.73.2111928162431
Min2.22.461015345
Max3.44.2244058385772
Range1.31.8183044355267
Brassicas
Average2.31.891522479
Min2.21.571218245
Max2.42.112203071115
Range0.20.55812579
Mixes
Average2.42.3152537193041
Min2.01.791421111928
Max3.23.3193249284254
Range1.21.6101828172326
Across Groups
Average2.32.3101625111722
Standard Error0.61.05912111621
Min1.10.7015-3-6-12
Max3.44.2244058385772
Range2.43.6243953416285
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 appropraite 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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