Table 8-a. Across location mean biomass, percent total nitrogen content‡, and estimated nitrogen release§ of 60 cover crop varieties evaluated in small plot replicated trials at three University of Tennessee AgResearch and Education Center locations in Tennessee during 2019-2020.
| Variety | Common Name | Group | Biomass (DM tons/ac) | Total Nitrogen (%) | Estimated N Released: Apr. Term. (lbs/ac) | Estimated N Released: May. Term. (lbs/ac) |
||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Apr† | May | Apr | May | 2 wks. | 4 wks. | 12 wks. | 2 wks. | 4 wks. | 12 wks. | |||||||
| Brassicas | ||||||||||||||||
| Impact | Collards | Brassica | 0.3 | Q-V | 0.7 | X-BB | 2 | Q-S | 1.9 | N-Q | 0.3 | 0.7 | 4.7 | 0.7 | 1.3 | 10.3 |
| Extender | Hyb. Brassica | Brassica | 0.4 | M-S | 0.6 | Y-BB | 1.9 | S-W | 1.6 | P-S | 0.3 | 0.3 | 4 | 0 | 0.3 | 5.3 |
| Viva | Hyb. Brassica | Brassica | 0.4 | L-S | 0.9 | U-AA | 1.9 | S-W | 1.6 | Q-S | 0 | 0.7 | 4.7 | 0 | 0.3 | 5 |
| Vivant | Hyb. Brassica | Brassica | 0.2 | S-V | 0.4 | AA-BB | 2 | Q-T | 1.9 | M-P | 0 | 0.7 | 3 | 0 | 0.7 | 6 |
| Aerifi | Radish | Brassica | 0.5 | J-P | 1.2 | P-W | 1.9 | ST | 1.6 | P-R | 0.3 | 1 | 6 | 0.3 | 0.7 | 10.3 |
| Digger | Radish | Brassica | 0.4 | L-S | 1.2 | Q-X | 2.1 | P-S | 1.8 | O-Q | 0.3 | 0.7 | 5.3 | 0 | 1 | 10.7 |
| Driller | Radish | Brassica | 0.3 | P-U | 1 | T-Z | 2 | Q-S | 1.8 | O-R | 0.3 | 0.7 | 4 | 0.3 | 0.7 | 9.3 |
| SERALPHA | Radish | Brassica | 0.5 | K-Q | 1.3 | L-U | 1.9 | S-U | 1.7 | P-R | 0.3 | 1 | 6 | 0 | 0.7 | 11 |
| SERWF19 | Radish | Brassica | 0.6 | G-M | 1.3 | M-U | 2 | Q-S | 1.6 | P-S | 0.3 | 1 | 7.3 | 0 | 0.7 | 7.7 |
| Smart | Radish | Brassica | 0.5 | J-P | 1.2 | Q-X | 1.9 | R-T | 1.5 | RS | 0.3 | 0.7 | 5 | 0 | 0.7 | 7.3 |
| Jackpot | Turnip | Brassica | 0.3 | P-U | 0.8 | V-BB | 2 | R-T | 1.6 | P-S | 0 | 0.7 | 4 | 0 | 0.3 | 5.3 |
| Average | 0.4 | 1 | 2 | 1.7 | 0.2 | 0.7 | 4.9 | 0.1 | 0.7 | 8 | ||||||
| Min | 0.2 | 0.4 | 1.9 | 1.5 | 0 | 0.3 | 3 | 0 | 0.3 | 5 | ||||||
| Max | 0.6 | 1.3 | 2.1 | 1.9 | 0.3 | 1 | 7.3 | 0.7 | 1.3 | 11 | ||||||
| Range | 0.4 | 0.9 | 0.2 | 0.4 | 0.3 | 0.7 | 4.3 | 0.7 | 1 | 6 | ||||||
† Varieties that have any MS letter in common are not significantly different (Fisher’s Protected LSD, P<0.05). Mean separation was performed across all entries. Varieties within the “A group” were top performers across all entries and mean separation letters of these entries are highlighted in dark orange.
For ease of viewing, the table is broken into functional groups (brassicas, cereals, legumes). Mean values for top performers within each functional group are highlighted in light orange (50th – 75th percentile) and dark orange (> 75th percentile).
‡ Analyzed using near infrared spectroscopy (NIRS) with the appropriate calibration for each species.
§ Estimated using quality constituents from NIRS inputted into the UGA cover crop nitrogen calculator.
Table 8-b. Across location mean biomass, percent total nitrogen content‡, and estimated nitrogen release§ of 60 cover crop varieties evaluated in small plot replicated trials at three University of Tennessee AgResearch and Education Center locations in Tennessee during 2019-2020.
| Variety | Common Name | Group | Biomass (DM tons/ac) | Total Nitrogen (%) | Estimated N Released: Apr. Term. (lbs/ac) | Estimated N Released: May. Term. (lbs/ac) | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Apr† | May | Apr | May | 2 wks. | 4 wks. | 12 wks. | 2 wks. | 4 wks. | 12 wks. | |||||||
| Cereals | ||||||||||||||||
| Centurion | Annual Ryegrass | Cereal | 0.3 | Q-V | 1 | S-Z | 1.5 | X-AA | 1 | TU | 0 | 0 | 2.3 | 0 | 0 | 3.3 |
| Lowboy | Annual Ryegrass | Cereal | 0.1 | V | 0.4 | AA-BB | 1.9 | ST | 1.3 | ST | 0 | 0 | 0.7 | 0 | 0 | 2.7 |
| 140760 | Barley | Cereal | 0.4 | L-S | 1.4 | I-U | 1.5 | X-B | 0.9 | U-Y | 0 | 0 | 1.7 | 0 | -0.3 | -0.7 |
| 140789 | Barley | Cereal | 0.5 | K-Q | 1.4 | K-U | 1.6 | W-Z | 1 | U-W | 0 | 0 | 2.3 | 0 | 0 | 1.3 |
| 140797 | Barley | Cereal | 0.4 | M-S | 1.2 | O-W | 1.6 | U-Y | 1 | UV | 0 | 0 | 2 | 0 | 0 | 1 |
| SB255 | Barley | Cereal | 0.4 | M-S | 1.3 | N-V | 1.6 | V-Z | 1 | U-X | 0 | 0 | 2.7 | 0 | 0 | 1.3 |
| Secretariat | Barley | Cereal | 0.4 | L-R | 1.4 | H-T | 1.7 | T-X | 1 | U-W | 0 | 0 | 3.3 | 0 | -0.3 | 1.7 |
| Bates RS4 | Cereal Rye | Cereal | 1.2 | AB | 2.3 | AB | 1.2 | AA-CC | 0.6 | Y | 0 | 0 | 0.7 | 0 | 0 | -6 |
| Elbon (1) | Cereal Rye | Cereal | 0.8 | D-H | 1.9 | A-H | 1.4 | X-C | 0.6 | Y | 0 | 0 | 2 | 0 | 0 | -5 |
| Elbon (2) | Cereal Rye | Cereal | 0.6 | G-M | 1.6 | E-Q | 1.6 | U-Y | 0.8 | U-Y | 0 | 0.7 | 3 | 0 | 0 | -2.3 |
| Goku | Cereal Rye | Cereal | 0.7 | F-K | 1.8 | B-M | 1.4 | Y-C | 0.8 | V-Y | 0 | 0 | 1.3 | 0 | 0 | -3.7 |
| NF95319B | Cereal Rye | Cereal | 1.1 | AB | 2.1 | A-E | 1.2 | AA-CC | 0.7 | XY | 0 | 0 | 1 | 0 | 0 | -5 |
| NF97325 | Cereal Rye | Cereal | 1.1 | A-C | 1.9 | A-H | 1.2 | AA-CC | 0.6 | Y | 0 | 0 | 0.3 | 0 | 0 | -5.7 |
| NF99362 | Cereal Rye | Cereal | 1 | B-E | 1.9 | A-I | 1.2 | AA-CC | 0.6 | Y | 0 | 0 | 1 | 0 | 0 | -5 |
| Wintergrazer 70 | Cereal Rye | Cereal | 0.9 | B-F | 1.9 | B-K | 1.3 | AA-CC | 0.7 | W-Y | 0 | 0 | 1 | 0 | 0 | -4.3 |
| Yankee | Cereal Rye | Cereal | 0.3 | P-U | 1.3 | N-V | 1.9 | S-V | 1 | T-V | 0 | 0 | 2.7 | 0 | 0 | 0.3 |
| Bob | Oat | Cereal | 0.6 | G-O | 1.7 | D-P | 1.4 | X-CC | 0.9 | U-Y | 0 | 0 | 2.7 | 0 | -0.7 | -1.7 |
| Cosaque | Oat | Cereal | 0.6 | H-P | 1.5 | F-R | 1.4 | Y-CC | 0.8 | U-Y | 0 | 0 | 2.3 | 0 | -0.7 | 0 |
| Hilliard | Wheat | Cereal | 0.7 | G-L | 1.8 | B-L | 1.4 | X-CC | 0.8 | U-Y | 0 | 0 | 3 | 0 | -0.7 | -2 |
| Liberty 5658 | Wheat | Cereal | 0.5 | I-P | 1.4 | J-U | 1.3 | Z-CC | 0.9 | U-Y | 0 | 0 | 2 | 0 | -0.3 | -1.3 |
| Average | 0.6 | 1.6 | 1.5 | 0.9 | 0 | 0 | 1.9 | 0 | -0.2 | -1.6 | ||||||
| Min | 0.1 | 0.4 | 1.2 | 0.6 | 0 | 0 | 0.3 | 0 | -0.7 | -6 | ||||||
| Max | 1.2 | 2.3 | 1.9 | 1.3 | 0 | 0.7 | 3.3 | 0 | 0 | 3.3 | ||||||
| Range | 1.1 | 1.9 | 0.8 | 0.7 | 0 | 0.7 | 3 | 0 | 0.7 | 9.3 | ||||||
† Varieties that have any MS letter in common are not significantly different (Fisher’s Protected LSD, P<0.05). Mean separation was performed across all entries. Varieties within the “A group” were top performers across all entries and mean separation letters of these entries are highlighted in dark orange.
For ease of viewing, the table is broken into functional groups (brassicas, cereals, legumes). Mean values for top performers within each functional group are highlighted in light orange (50th – 75th percentile) and dark orange (> 75th percentile).
‡ Analyzed using near infrared spectroscopy (NIRS) with the appropraite calibration for each species.
§ Estimated using quality constituents from NIRS inputted into the UGA cover crop nitrogen calculator.
Table 8-c. Across location mean biomass, percent total nitrogen content‡, and estimated nitrogen release§ of 60 cover crop varieties evaluated in small plot replicated trials at three University of Tennessee AgResearch and Education Center locations in Tennessee during 2019-2020.
| Variety | Common Name | Group | Biomass (DM tons/ac) | Total Nitrogen (%) | Estimated N Released: Apr. Term. (lbs/ac) | Estimated N Released: May. Term. (lbs/ac) | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Apr† | May | Apr | May | 2 wks. | 4 wks. | 12 wks. | 2 wks. | 4 wks. | 12 wks. | ||||||||
| Legumes | |||||||||||||||||
| CC19048 | FIXatioN | Clover, Balansa | Legume | 0.3 | O-T | 1.2 | Q-W | 3.3 | E-G | 2.6 | IJ | 0.7 | 2 | 12 | 2 | 5 | 36.7 |
| CC19049 | Paradana | Clover, Balansa | Legume | 0.2 | R-V | 0.7 | W-BB | 2.6 | L-N | 2.1 | K-N | 0 | 0.7 | 4.7 | 1 | 2 | 15.3 |
| CC19050 | Viper | Clover, Balansa | Legume | 0.4 | M-S | 1.8 | D-O | 3.1 | G-J | 2.4 | JK | 1 | 2 | 13.7 | 2.7 | 5.7 | 45 |
| CC19051 | Balady | Clover, Berseem | Legume | 0 | V | 0.3 | AA-BB | 1.6 | U-Y | 2.2 | KL | 0 | 0 | 0.5 | 0.3 | 0.7 | 6.7 |
| CC19052 | Frosty | Clover, Berseem | Legume | 0.2 | R-V | 1.1 | R-Y | 3 | H-K | 2.7 | IJ | 0.3 | 0.7 | 5 | 2 | 4.3 | 32 |
| CC19053 | AU Sunrise | Clover, Crimson | Legume | 0.5 | K-Q | 1.7 | D-O | 2.7 | LM | 2.1 | K-N | 0.7 | 1.7 | 11 | 1.7 | 4.3 | 32.7 |
| CC19061 | Bolsena | Clover, Crimson | Legume | 0.5 | J-Q | 1.6 | E-R | 2.9 | I-L | 2.1 | K-N | 1 | 2 | 12.7 | 1.7 | 3.7 | 30.3 |
| CC19054 | Dixie | Clover, Crimson | Legume | 0.5 | K-Q | 1.6 | E-Q | 2.8 | K-M | 2.2 | KL | 0.7 | 1.7 | 12 | 1.7 | 4.7 | 33.3 |
| CC19055 | Kentucky Pride | Clover, Crimson | Legume | 0.3 | O-T | 1.5 | F-S | 2.8 | KL | 2.2 | KL | 0.3 | 1.3 | 8.7 | 1.7 | 4.3 | 32.3 |
| CC19056 | SECCM18 | Clover, Crimson | Legume | 0.5 | I-P | 2 | A-F | 2.8 | J-L | 2.2 | K-M | 0.7 | 2 | 13 | 2 | 4.7 | 36.7 |
| CC19063 | White Cloud | Clover, Crimson | Legume | 0.3 | N-T | 1.2 | P-W | 2.7 | K-M | 2 | L-O | 0.3 | 1.3 | 8 | 1.3 | 2.7 | 22.7 |
| CC19060 | Big Red | Clover, Red | Legume | 0.1 | UV | 0.6 | Z-BB | 2.3 | O-Q | 2.6 | IJ | 0 | 0 | 1.3 | 0.7 | 2 | 16.3 |
| CC19057 | Blaze | Clover, Red | Legume | 0.1 | V | 0.4 | AA-BB | 2.3 | N-P | 2.9 | G-I | 0 | 0 | 0.7 | 1 | 2 | 14 |
| CC19058 | GA9909 | Clover, Red | Legume | 0.1 | T-V | 0.7 | W-BB | 2.5 | M-O | 3 | F-H | 0 | 0.3 | 2 | 1.3 | 3.3 | 24 |
| CC19059 | VNS | Clover, Red | Legume | 0.1 | T-V | 0.5 | Z-BB | 2.2 | O-R | 3 | F-H | 0 | 0 | 1 | 1 | 2 | 17 |
| CC19019 | VNS | Vetch, Common | Legume | 0.6 | G-M | 2.2 | A-D | 3.3 | F-H | 2.7 | IJ | 1.3 | 3 | 18.7 | 4 | 9 | 70 |
| CC19020 | AU Merit | Vetch, Hairy | Legume | 1.2 | A | 2.3 | A-C | 4.1 | A | 3.9 | A | 3 | 7 | 44.3 | 5.3 | 12.3 | 91.7 |
| CC19021 | Patagonia Inta | Vetch, Hairy | Legume | 1 | A-D | 1.9 | A-I | 4 | A | 3.5 | BC | 2.3 | 6.3 | 37 | 3.7 | 8.3 | 62.7 |
| CC19022 | Purple Bounty | Vetch, Hairy | Legume | 0.8 | E-I | 1.9 | A-H | 4 | A | 3 | F-H | 2 | 4.3 | 29 | 3 | 7.3 | 53.3 |
| CC19018 | Villana | Vetch, Hairy | Legume | 0.7 | G-L | 1.6 | E-R | 3.8 | A-C | 3.5 | B | 1.7 | 4 | 25.3 | 3.3 | 8.3 | 61.7 |
| CC19023 | WinterKing | Vetch, Hairy | Legume | 1.2 | AB | 1.8 | C-N | 3.9 | AB | 3.4 | B-D | 3 | 6.3 | 40 | 3.7 | 8.3 | 61.7 |
| CC19024 | Namoi | Vetch, Woolypod | Legume | 0.8 | C-G | 1.5 | G-T | 3.8 | A-C | 3.3 | B-F | 1.7 | 4 | 27 | 2.7 | 6 | 46 |
| CC19027 | Double OO | Winter Pea | Legume | 0.7 | G-L | 1.8 | B-K | 3.1 | G-I | 2.8 | HI | 1.3 | 3 | 17 | 2.7 | 6.7 | 52 |
| CC19028 | Survivor | Winter Pea | Legume | 0.8 | D-I | 2.4 | A | 3.2 | F-H | 3.1 | E-G | 1.7 | 3.7 | 22.3 | 4 | 9.3 | 70 |
| CC19025 | VNS (1) | Winter Pea | Legume | 0.7 | E-K | 1.9 | A-J | 3.3 | E-G | 2.9 | G-I | 1.3 | 3.7 | 21.3 | 3 | 7 | 55.7 |
| CC19026 | VNS (2) | Winter Pea | Legume | 0.7 | E-K | 2 | A-G | 3.6 | C-E | 3.4 | B-E | 1.3 | 4 | 24.3 | 3.7 | 9 | 66 |
| CC19029 | Windham | Winter Pea | Legume | 0.6 | G-N | 1.8 | C-N | 3.6 | B-D | 3 | F-H | 1.3 | 3.3 | 19.7 | 3 | 7.3 | 56.7 |
| CC19030 | WyoWinter (1) | Winter Pea | Legume | 0.6 | G-M | 1.9 | A-H | 3.5 | D-F | 3.2 | C-F | 1.7 | 3.3 | 19.3 | 3.7 | 9 | 66.3 |
| CC19031 | WyoWinter (2) | Winter Pea | Legume | 0.8 | E-J | 1.9 | A-H | 3.3 | D-G | 3.2 | D-G | 1.7 | 4 | 24.7 | 3.3 | 8 | 59.3 |
| Average | 0.5 | 1.5 | 3.1 | 2.8 | 1.1 | 2.6 | 16.4 | 2.4 | 5.8 | 43.7 | |||||||
| Min | 0 | 0.3 | 1.6 | 2 | 0 | 0 | 0.5 | 0.3 | 0.7 | 6.7 | |||||||
| Max | 1.2 | 2.4 | 4.1 | 3.9 | 3 | 7 | 44.3 | 5.3 | 12.3 | 91.7 | |||||||
| Range | 1.2 | 2 | 2.4 | 1.9 | 3 | 7 | 43.8 | 5 | 11.7 | 85 | |||||||
† Varieties that have any MS letter in common are not significantly different (Fisher’s Protected LSD, P<0.05). Mean separation was performed across all entries. Varieties within the “A group” were top performers across all entries and mean separation letters of these entries are highlighted in dark orange.
For ease of viewing, the table is broken into functional groups (brassicas, cereals, legumes). Mean values for top performers within each functional group are highlighted in light orange (50th – 75th percentile) and dark orange (> 75th percentile).
‡ Analyzed using near infrared spectroscopy (NIRS) with the appropraite calibration for each species.
§ Estimated using quality constituents from NIRS inputted into the UGA cover crop nitrogen calculator.
Table 8-d. Summary statistics and ANOVA p-values for across location mean biomass, percent total nitrogen content‡, and estimated nitrogen release§ of 60 cover crop varieties evaluated in small plot replicated trials at three University of Tennessee AgResearch and Education Center locations in Tennessee during 2019-2020.
| Group | Biomass (DM tons/ac) | Total Nitrogen (%) | Estimated N Released: Apr. Term. (lbs/ac) | Estimated N Released: May. Term. (lbs/ac) |
||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Apr† | May | Apr | May | 2 wks. | 4 wks. | 12 wks. | 2 wks. | 4 wks. | 12 wks. | |
| Brassicas | ||||||||||
| Average | 0.4 | 1 | 2 | 1.7 | 0 | 1 | 5 | 0 | 1 | 8 |
| Min | 0.2 | 0.4 | 1.9 | 1.5 | 0 | 0 | 3 | 0 | 0 | 5 |
| Max | 0.6 | 1.3 | 2.1 | 1.9 | 0 | 1 | 7 | 1 | 1 | 11 |
| Range | 0.4 | 0.9 | 0.2 | 0.4 | 0 | 1 | 4 | 1 | 1 | 6 |
| Cereals | ||||||||||
| Average | 0.6 | 1.6 | 1.5 | 0.9 | 0 | 0 | 2 | 0 | 0 | -2 |
| Min | 0.1 | 0.4 | 1.2 | 0.6 | 0 | 0 | 0 | 0 | -1 | -6 |
| Max | 1.2 | 2.3 | 1.9 | 1.3 | 0 | 1 | 3 | 0 | 0 | 3 |
| Range | 1.1 | 1.9 | 0.8 | 0.7 | 0 | 1 | 3 | 0 | 1 | 9 |
| Legumes | ||||||||||
| Average | 0.5 | 1.5 | 3.1 | 2.8 | 1 | 3 | 16 | 2 | 6 | 44 |
| Min | 0 | 0.3 | 1.6 | 2 | 0 | 0 | 1 | 0 | 1 | 7 |
| Max | 1.2 | 2.4 | 4.1 | 3.9 | 3 | 7 | 44 | 5 | 12 | 92 |
| Range | 1.2 | 2 | 2.4 | 1.9 | 3 | 7 | 44 | 5 | 12 | 85 |
| Across Groups | ||||||||||
| Average | 0.5 | 1.4 | 2.4 | 1.9 | 1 | 1 | 9 | 1 | 3 | 22 |
| Standard Error | 0.1 | 0.1 | 0.1 | 0.1 | 0 | 0 | 1 | 0 | 0 | 3 |
| Min | 0 | 0.3 | 1.2 | 0.6 | 0 | 0 | 0 | 0 | -1 | -6 |
| Max | 1.2 | 2.4 | 4.1 | 3.9 | 3 | 7 | 44 | 5 | 12 | 92 |
| Range | 1.2 | 2 | 2.9 | 3.3 | 3 | 7 | 44 | 5 | 13 | 98 |
‡ Analyzed using near infrared spectroscopy (NIRS) with the appropraite calibration for each species.
§ Estimated using quality constituents from NIRS inputted into the UGA cover crop nitrogen calculator.
Virginia Sykes vsykes@utk.edu
- Table 1. 2021 Total entry numbers - December 26, 2021
- Table A-35. Mean yields and agronomic data from Memphis, TN, MG-5 - December 23, 2021
- Table A-34. Mean yields and agronomic data from Jackson, TN, MG-5 - December 22, 2021