Table 6. Early Oct. Planted, Across Location, Nitrogen Content and Release

Table 6. Across 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 two University of Tennessee AgResearch and Education Center locations, in 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 Rye1.3S0.9OP2O-Q5N-P11L-O-1NO-2O-1MN
ElbonCereal Rye1.5RS1.2N-P3M-Q6M-P11L-O3K-O5K-O10J-N
NF95319BCereal Rye1.3S0.9P1PQ3P7O-2O-3O-5N
NF97325Cereal Rye1.4S0.9P1PQ4OP8NO-1NO-2M-O-2MN
NF99362Cereal Rye1.5Q-S0.9P3N-Q6M-P11L-O-1O-2NO-3N
TriCal RayCereal Rye1.3S0.9P1Q3P6O-1NO-2NO-2MN
YankeeCereal Rye2.1L-O1.3M-O6J-P10J-P16J-O2K-O5K-O11J-N
TriCal EXP 20T06Triticale1.5RS1.2N-P3M-Q7L-P15J-O1M-O4L-O10J-N
TriCal EXP 21T01Triticale1.5Q-S1.3MN4L-Q9L-P16J-O3K-O6K-O12J-N
TriCal Flex 719Triticale1.8O-Q1.3MN6J-P11J-P17I-O3K-O7J-O12J-N
TriCal SurgeTriticale1.7P-R1.3MN5L-Q9L-P15J-O2L-O4K-O8J-N
TN1902Wheat2.0N-P1.6LM7I-O11I-O18I-O6J-O11I-N18H-L
Legumes
FIXatioNClover, Balansa2.7F-J2.9E-G7I-O11I-O17I-O13F-J20G-J26G-J
ParadanaClover, Balansa2.7F-I2.6GH6K-P10J-P15J-O8H-N13H-M17H-M
TaipanClover, Balansa2.7F-J2.5HI5L-Q8L-P12L-O7I-O10I-O13I-N
ViperClover, Balansa2.8F-H2.7GH8I-N13I-N19I-N11G-L17H-L22H-L
FrostyClover, Berseem3.3CD3.1C-E14C-G23C-G34C-H27A-C42B-D54B-D
LightningClover, Berseem3.2C-E3.0D-F15C-G25C-F36C-G21C-F32D-G42D-G
*UF_CC_17Clover, Crimson2.8F-H2.6GH9H-L15G-L22H-L16E-I24F-I32F-I
DixieClover, Crimson2.9E-G2.6GH11F-J18F-J26F-J28A-C43A-D56A-D
Kentucky PrideClover, Crimson3.0D-F2.7F-H13D-H22D-H32D-H24C-E37D-F48D-F
GO-PER-12Clover, Persian2.5H-L3.4BC6K-Q9K-P14K-O10H-M16H-L21H-L
DynamiteClover, Red3.2C-E3.3B-D7I-O12I-N18I-O18D-H27E-H35E-H
Q (FL24D)Clover, Red2.9E-G3.4BC6I-O10J-P15J-O11G-K17H-K23H-K
*UF_WC_LateOcoeeClover, White2.5H-M3.4BC3M-Q6M-P9M-O2L-O3L-O4L-N
*UF_WC_ML17Clover, White2.4I-M3.4BC4M-Q6M-P9M-O6J-O10J-O13J-N
AU MeritVetch, Hairy3.6AB3.9A21AB35AB50AB29A-C43A-D57A-D
PatagoniaVetch, Hairy3.7AB4.0A18A-D29A-D42A-D26B-D40C-E52C-E
WinterKingVetch, Hairy3.8A4.0A17B-D27B-E40B-E36A55AB71AB
SurvivorWinter Pea3.3CD3.4B22A36A53A34AB51A-C67A-C
Brassicas
VivantHybrid (turnip x rapeseed)2.3K-N1.8KL6K-Q10J-P15J-O5J-O8J-O10J-N
AerifiRadish2.5H-L2.1JK6J-P11J-P15J-O3K-O5K-O7K-N
CCS-779Radish2.4I-M2.0JK5L-Q8L-P12L-O6J-O8J-O11J-N
DrillerRadish2.7F-J2.2IJ6I-Q10J-P15J-O2L-O3L-O4L-N
FragiBlasterRadish2.5H-K1.8KL8I-M14H-M20I-M5J-O8J-O11J-N
Jackpot Turnip2.3J-N1.8KL6K-Q10J-P16J-O4K-O6K-O8J-N
Mixes
Bates RS4 (20%) + Dixie (80%)Cereal Rye + Crimson Clover2.1M-O2.0JK14C-G24C-F37C-G23C-E38C-F53C-E
Bates RS4 (20%) + AU Merit (80%)Cereal Rye +
Hairy Vetch
2.5H-K2.6H16B-E27B-E41A-D35AB54AB73A
Bates RS4 (10%) + Dixie (90%)Cereal Rye + Crimson Clover2.3K-N1.9JK11E-I19E-I29E-I20C-G33D-G47D-F
Bates RS4 (10%) + AU Merit (90%)Cereal Rye +
Hairy Vetch
2.7F-I2.8E-H18A-C30A-C45A-C36A55A74A
Yankee (20%) +
Dixie (80%)
Cereal Rye + Crimson Clover2.7F-J2.1J11G-K17F-K25G-K21C-F33D-G45D-F
Yankee (20%) +
AU Merit (80%)
Cereal Rye +
Hairy Vetch
3.2C-E2.7F-H15C-G24C-F36C-G25C-E37D-F49C-F
TN1902 (20%) +
Dixie (80%)
Wheat +
Crimson Clover
2.6G-J2.1JK16C-F25C-F38C-F21C-F32D-G44D-F
TN1902 (20%) +
AU Merit (80%)
Wheat +
Hairy Vetch
3.4BC3.3B-D17A-D28A-D42A-D23C-E35D-F46D-F
Cereals
Average1.61.14712136
Min1.30.9136-2-3-5
Max2.11.67111861118
Range0.90.7691181423
Legumes
Average3.03.2111726182836
Min2.42.5369234
Max3.84.0223653365571
Range1.41.5193044345267
Brassicas
Average2.41.961015469
Min2.31.85812234
Max2.72.2814206811
Range0.40.4368457
Mixes
Average2.72.4152436264054
Min2.11.9111725203244
Max3.43.3183045365574
Range1.21.481320162330
Across Groups
Average2.52.391523132027
Standard Error0.70.96913121823
Min1.30.9136-2-3-5
Max3.84.0223653365574
Range2.53.1213446385879
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
Scroll to Top