Table 14. Early Oct. Planted, Spring Hill, TN, Nitrogen Content and Release

Table 14. 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 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 Rye1.4T1.0S2K4L7K-1L-1K0K
ElbonCereal Rye1.5T1.5P-R3K5L9K6J-L11I-K19H-K
NF95319BCereal Rye1.5T1.1RS3K5L9K0L1K2K
NF97325Cereal Rye1.4T1.1RS2K3L6K0L0K3JK
NF99362Cereal Rye1.6T1.0RS3K5L8K0L1K3JK
TriCal RayCereal Rye1.3T1.0RS1K3L5K0L0K0K
YankeeCereal Rye2.2Q-S1.4P-S4JK6L10JK4J-L9I-K15I-K
TriCal EXP 20T06Triticale1.5T1.2Q-S2K5L10JK1KL3I-K8I-K
TriCal EXP 21T01Triticale1.6T1.3Q-S4K7KL11H-K2J-L5I-K10I-K
TriCal Flex 719Triticale1.8R-T1.4P-S4I-K7J-L11H-K4J-L9I-K15I-K
TriCal SurgeTriticale1.8ST1.6O-Q4JK7KL10I-K4J-L8I-K13I-K
TN1902Wheat2.2Q-S1.8N-P5H-K8I-L12F-K8I-L14H-K20G-K
Legumes
FIXatioNClover, Balansa2.9G-L3.0C-F5H-K8I-L12G-K15F-J22E-I29E-I
ParadanaClover, Balansa2.9I-N2.5G-L5H-K8I-L11H-K10H-L16G-K21G-K
TaipanClover, Balansa2.9H-M2.6F-K2K4L6K9H-L14H-K19H-K
ViperClover, Balansa3.4D-H2.7E-I6F-K10G-L15E-K14G-K21F-J28F-J
FrostyClover, Berseem3.5C-F3.1C-E11D-I19E-I28C-H27D-F41C-E54C-E
LightningClover, Berseem3.5C-F2.9C-F12D-G20D-H29C-F22E-H34D-G45D-G
*UF_CC_17Clover, Crimson3.3D-J2.8D-H11D-I19E-J27C-I27D-F42CD55CD
DixieClover, Crimson3.4C-G2.8E-I14B-E22B-F33B-D41A-C62AB82AB
Kentucky PrideClover, Crimson3.5C-E2.9D-G17B-E28B-F40A-D32B-E48B-D65B-D
GO-PER-12Clover, Persian2.6K-Q3.4A-C1K2L3K6J-L10I-K12I-K
DynamiteClover, Red3.7A-D3.3B-D5G-K9H-L13E-K20E-I31D-H41D-H
Q (FL24D)Clover, Red3.3D-I3.4A-C2K3L5K10H-L15G-K20G-K
*UF_WC_LateOcoeeClover, White2.7K-Q3.1C-E1K2L2K2KL2JK3JK
*UF_WC_ML17Clover, White2.7K-Q3.3B-D1K2L3K7J-L11I-K14I-K
AU MeritVetch, Hairy3.9A-C3.7AB24A40A57A31C-E47B-D62B-D
PatagoniaVetch, Hairy4.1AB3.8A18A-D30A-E44A-C27D-F42CD55CD
WinterKingVetch, Hairy4.1A3.7AB20AB33AB48AB38A-D58A-C76A-C
SurvivorWinter Pea3.6CD3.3B-D20A-C32A-C47AB30C-E46B-D61B-D
Brassicas
VivantHybrid (turnip x rapeseed)2.3O-Q2.0M-O4I-K7KL10I-K5J-L7I-K9I-K
AerifiRadish2.6K-Q2.0L-O3K5L7K3J-L5I-K7I-K
CCS-779Radish2.5L-Q2.3I-M2K3L4K4J-L6I-K8I-K
DrillerRadish3.0E-L2.3I-M3JK5KL8JK2KL3JK3JK
FragiBlasterRadish2.8J-O2.0L-O4I-K7KL10JK6J-L9I-K12I-K
Jackpot Turnip2.4N-Q1.9M-O4I-K7J-L14E-K5J-L8I-K10I-K
Mixes
Bates RS4 (20%) + Dixie (80%)Cereal Rye + Crimson Clover2.3P-R2.2J-N12D-H19E-I29C-G29C-E47B-D64B-D
Bates RS4 (20%) + AU Merit (80%)Cereal Rye +
Hairy Vetch
2.7K-P2.8E-I13C-F22C-G32B-D44AB69A93A
Bates RS4 (10%) + Dixie (90%)Cereal Rye + Crimson Clover2.4M-Q2.2K-N11E-J18F-K26D-J29C-E47B-D65B-D
Bates RS4 (10%) + AU Merit (90%)Cereal Rye +
Hairy Vetch
3.0F-K3.0C-F20A-C32A-D47AB45A69A93A
Yankee (20%) +
Dixie (80%)
Cereal Rye + Crimson Clover3.0G-L2.2K-N12D-G20E-H30C-E23E-G37D-F51D-F
Yankee (20%) +
AU Merit (80%)
Cereal Rye +
Hairy Vetch
3.7A-D2.7E-J17A-E28B-F41A-D26D-G39C-F53C-F
TN1902 (20%) +
Dixie (80%)
Wheat +
Crimson Clover
2.9H-M2.4H-M14B-E23B-F34B-D29C-E45B-D60B-D
TN1902 (20%) +
AU Merit (80%)
Wheat +
Hairy Vetch
3.6B-D3.3A-C20A-C32A-C47AB28C-E43B-D58B-D
Cereals
Average1.61.3359259
Min1.31.0135-1-10
Max2.21.8581281420
Range0.90.845791520
Legumes
Average3.33.1101624203141
Min2.62.5122223
Max4.13.8244057416282
Range1.61.3233855396079
Brassicas
Average2.62.1469468
Min2.31.9234233
Max3.02.347146912
Range0.60.4249469
Mixes
Average3.02.6152436324967
Min2.32.2111826233751
Max3.73.3203247456993
Range1.41.291421223242
Across Groups
Average2.72.481320152433
Standard Error0.80.871116142128
Min1.31.0122-1-10
Max4.13.8244057456993
Range2.82.8233855467093
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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