Table 21. By location mean cover and height of 36 cover crop varieties and 8 mixes planted in early Nov. 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.
† 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.
| Variety | Common Name | Canopy Cover (%) | Height (in) | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dec | Feb | Apr§ | May‡‡ | Dec | Feb | Apr | May | ||||||||||
| Cereals | |||||||||||||||||
| Bates RS4 | Cereal Rye | 39 | A-D | 45 | A | 92 | A-E | 97 | AB | 5 | BC | 4 | B | 30 | A | 64 | B |
| Elbon | Cereal Rye | 44 | A | 43 | AB | 87 | B-F | 95 | A-C | 6 | AB | 3 | C | 22 | B | 63 | B |
| NF95319B | Cereal Rye | 42 | A-C | 42 | AB | 92 | A-E | 97 | AB | 6 | AB | 5 | A | 31 | A | 64 | B |
| NF97325 | Cereal Rye | 40 | A-D | 42 | AB | 90 | A-E | 95 | A-C | 5 | AB | 5 | A | 30 | A | 62 | B |
| NF99362 | Cereal Rye | 36 | A-E | 39 | A-D | 95 | A-C | 97 | AB | 6 | AB | 5 | A | 29 | A | 66 | AB |
| Yankee | Cereal Rye | 43 | AB | 38 | A-D | 83 | D-G | 90 | A-D | 6 | A | 3 | BC | 10 | C-E | 32 | E-G |
| TN1902 | Wheat | 35 | A-E | 38 | A-D | 87 | B-F | 87 | A-E | 4 | CD | 3 | BC | 13 | CD | 26 | G-I |
| Legumes | |||||||||||||||||
| Paradana | Clover, Balansa | 24 | H-J | 19 | H | 12 | L | 57 | H | 3 | E | 3 | C | 4 | GH | 8 | K |
| Taipan | Clover, Balansa | 19 | J | 20 | GH | 15 | KL | 58 | H | 3 | E | 3 | C | 3 | H | 8 | K |
| Viper | Clover, Balansa | 19 | J | 19 | H | 23 | JK | 82 | C-F | 3 | E | 3 | C | 4 | GH | 11 | JK |
| Lightning | Clover, Berseem | 21 | IJ | 22 | GH | 30 | J | 75 | E-G | 3 | E | 3 | C | 5 | E-H | 9 | JK |
| Dixie | Clover, Crimson | 24 | G-J | 22 | GH | 42 | I | 78 | D-F | 3 | E | 3 | C | 4 | F-H | 15 | J |
| AU Merit | Vetch, Hairy | 27 | E-J | 27 | E-H | 93 | A-D | 100 | A | 4 | DE | 3 | C | 9 | C-F | 23 | I |
| Patagonia | Vetch, Hairy | 30 | E-I | 27 | E-H | 93 | A-D | 100 | A | 4 | D | 3 | C | 9 | C-F | 25 | HI |
| WinterKing | Vetch, Hairy | 25 | G-J | 20 | GH | 90 | A-E | 98 | AB | 4 | D | 3 | C | 8 | D-G | 24 | I |
| Brassicas | |||||||||||||||||
| Vivant | Hybrid (turnip x rapeseed) | 25 | F-J | 27 | E-H | 75 | GH | 63 | GH | 3 | E | 3 | C | 22 | B | 37 | C-E |
| Aerifi | Radish | 24 | H-J | 26 | F-H | 78 | F-H | 70 | F-H | 3 | E | 4 | B | 21 | B | 31 | F-H |
| Jackpot | Turnip | 28 | E-I | 22 | GH | 70 | H | 75 | E-G | 3 | E | 3 | C | 23 | B | 40 | C |
| Mixes | |||||||||||||||||
| Bates RS4 (20%) + Dixie (80%) | Cereal Rye + Crimson Clover | 27 | E-J | 34 | B-E | 90 | A-E | 85 | B-E | 5 | AB | 3 | BC | 30 | A | 64 | AB |
| Bates RS4 (20%) + AU Merit (80%) | Cereal Rye + Hairy Vetch | 34 | B-F | 41 | A-C | 98 | A | 100 | A | 6 | AB | 5 | A | 29 | A | 68 | AB |
| Bates RS4 (10%) + Dixie (90%) | Cereal Rye + Crimson Clover | 27 | E-J | 33 | C-F | 87 | B-F | 88 | A-E | 5 | AB | 4 | BC | 29 | A | 66 | AB |
| Bates RS4 (10%) + AU Merit (90%) | Cereal Rye + Hairy Vetch | 30 | D-H | 32 | D-F | 98 | A | 100 | A | 6 | A | 4 | BC | 31 | A | 70 | A |
| Yankee (20%) + Dixie (80%) | Cereal Rye + Crimson Clover | 28 | E-J | 28 | E-G | 85 | C-G | 90 | A-D | 6 | A | 3 | C | 11 | CD | 32 | E-G |
| Yankee (20%) + AU Merit (80%) | Cereal Rye + Hairy Vetch | 35 | A-E | 31 | D-F | 97 | AB | 100 | A | 6 | AB | 3 | C | 14 | C | 39 | CD |
| TN1902 (20%) + Dixie (80%) | Wheat + Crimson Clover | 28 | E-I | 25 | F-H | 82 | E-G | 88 | A-E | 4 | CD | 3 | C | 13 | CD | 27 | G-I |
| TN1902 (20%) + AU Merit (80%) | Wheat + Hairy Vetch | 33 | C-G | 32 | D-F | 97 | AB | 100 | A | 4 | CD | 3 | C | 14 | C | 34 | D-F |
| Cereals | |||||||||||||||||
| Average | 40 | 41 | 89 | 94 | 5 | 4 | 24 | 54 | |||||||||
| Min | 35 | 38 | 83 | 87 | 4 | 3 | 10 | 26 | |||||||||
| Max | 44 | 45 | 95 | 97 | 6 | 5 | 31 | 66 | |||||||||
| Range | 9 | 7 | 12 | 10 | 2 | 2 | 21 | 40 | |||||||||
| Legumes | |||||||||||||||||
| Average | 23 | 22 | 50 | 81 | 3 | 3 | 6 | 15 | |||||||||
| Min | 19 | 19 | 12 | 57 | 3 | 3 | 3 | 8 | |||||||||
| Max | 30 | 27 | 93 | 100 | 4 | 3 | 9 | 25 | |||||||||
| Range | 11 | 8 | 82 | 43 | 1 | 0 | 6 | 18 | |||||||||
| Brassicas | |||||||||||||||||
| Average | 26 | 25 | 74 | 69 | 3 | 3 | 22 | 36 | |||||||||
| Min | 24 | 22 | 70 | 63 | 3 | 3 | 21 | 31 | |||||||||
| Max | 28 | 27 | 78 | 75 | 3 | 4 | 23 | 40 | |||||||||
| Range | 4 | 5 | 8 | 12 | 0 | 1 | 2 | 10 | |||||||||
| Mixes | |||||||||||||||||
| Average | 30 | 32 | 92 | 94 | 5 | 4 | 21 | 50 | |||||||||
| Min | 27 | 25 | 82 | 85 | 4 | 3 | 11 | 27 | |||||||||
| Max | 35 | 41 | 98 | 100 | 6 | 5 | 31 | 70 | |||||||||
| Range | 8 | 16 | 17 | 15 | 2 | 2 | 20 | 44 | |||||||||
| Across Groups | |||||||||||||||||
| Average | 30 | 31 | 76 | 87 | 4 | 3 | 17 | 39 | |||||||||
| Standard Error | 7 | 8 | 27 | 14 | 1 | 1 | 10 | 22 | |||||||||
| Min | 19 | 19 | 12 | 57 | 3 | 3 | 3 | 8 | |||||||||
| Max | 44 | 45 | 98 | 100 | 6 | 5 | 31 | 70 | |||||||||
| Range | 25 | 26 | 87 | 43 | 3 | 2 | 28 | 63 | |||||||||
| ANOVA p-values | |||||||||||||||||
| – Variety | <0.001 | <0.001 | <0.001 | – | <0.001 | <0.001 | <0.001 | <0.001 | |||||||||
| – Location | <0.001 | <0.001 | <0.001 | – | 0.003 | 0.003 | <0.001 | <0.001 | |||||||||
| – Variety x Location | N.S. | <0.001 | <0.001 | – | <0.001 | <0.001 | <0.001 | <0.001 |
Questions about table data?
Virginia Sykes vsykes@utk.edu
Virginia Sykes vsykes@utk.edu
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