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| Soybean variety trials in Rochester, MN |
Study details
The studies were conducted near Rochester, MN (Lawler site) on a Port Byron silt loam:- Planted May 18, 2018 with a 4-row John Deere planter equipped with cone units.
- Seeding rate: 150,000 seeds per acre at a depth of 1.5 inches.
- Row spacing: 30-inch rows.
- Plot size: 4 rows by 22 feet.
- Machine harvested center 2 rows of each plot on October 18, 2018.
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| Planting soybean with a cone planter. |
Power in study design
The power of our research is that we lay out trials in a statistically sound manner, with randomized and replicated treatments at each location, to help take out effects due to variability across the field (e.g. soil type, drainage, topography, pest pressure, etc.). Each variety was randomly placed into each block or replication. We used four blocks of the treatments (replications), which is considered the standard for field research. We then conducted statistical analysis on the results to help determine if any numerical differences in yield were likely due to actual differences in performance or other factors we couldn’t control.In the tables that follow, moisture and yield results followed by the same letter are considered not statistically different.
What do the letters in the table mean?
For varieties followed by the same letter, we would not expect to see a difference in yield in the field. Even though the average yield of varieties in this case may be numerically different by a few bushels, there was enough variability in yield across replications that no real trend could be found. In other words, we can't say with confidence that these varieties differ in yield.Consider a comparison between variety X vs Y. If variety X yielded more than Y in two replications, and Y more than X in the others, these likely would come out statistically the same. In another example, variety X may out-yield Y in one replication by quite a bit, but then yield less than Y in the other three replications. Here again, these likely would not be considered statistically different, although the average yields may not be numerically the same.
The LSD is the "least significant difference" or the minimum difference in yield we need to see before we can say with confidence that there is a true difference in yield between a pair of varieties. The more variability in yield across a plot, the larger the LSD.
The p value (P in the tables below) indicates the probability or confidence we have that two entries differ in yield when the difference is equal to or greater than the LSD. When P = 0.10, this indicates we can be 90% confident variety X performs better than variety Y if the yield difference is equal to or greater than the LSD. Likewise, if P = .20, we would have 80% confidence the two varieties differ in yield when the yield difference is equal to or greater than the LSD. For variety trials, a p value of .10 or .20 is considered standard.
For more information about interpretation of the LSD, see the articles Field studies: What do you mean 5 bushels per acre is not significant? or How to do research on your farm.
2018 Soybean yield results
Tables 1 and 2 provide the yield for the early maturity entries at 13% moisture by entry and yield rank, respectively. Early maturity soybean yield average was 56.7 bu/a with a range of 63.6-48.8 bu/a.Tables 3 and 4 provide the yield for the late maturity entries at 13% moisture by entry and yield rank, respectively. Late maturity soybean yield average was 61.5 bu/a. with a range of 65.6-55.1 bu/a.
Table 1. Early maturity (1.1-1.8) soybean yield results by entry number from Lawler farm, Rochester, MN. Soybeans were harvested October 18, 2018 and yields adjusted to 13 percent moisture.
| No. | Name | Maturity | Moisture (%) | Yield (bu/a) | ||
|---|---|---|---|---|---|---|
| 1 | AGRIGOLD G1502RX | 1.5 | 13.2 | b-e | 58.7 | b-f |
| 2 | AGRIGOLD G1710RX | 1.7 | 12.9 | fg | 55.0 | f-i |
| 3 | ASGROW AG11X8 | 1.1 | 12.8 | g | 55.6 | d-h |
| 4 | ASGROW AG17X8 | 1.7 | 13.3 | bc | 52.1 | hij |
| 5 | DAHLMAN 6713XN | 1.3 | 13.0 |
c-f
|
53.5 |
ghi
|
| 6 | DAHLMAN 6815XN | 1.5 | 12.9 | fg | 51.4 | ij |
| 7 | DAHLMAN 6818XN | 1.8 | 12.8 | g | 59.1 | b-e |
| 8 | DAIRYLAND DSR-1526/R2Y | 1.5 | 13.0 | efg | 56.9 | d-g |
| 9 | DAIRYLAND DSR-1870/R2Y | 1.8 | 13.2 | b-e | 55.0 | f-i |
| 10 | GOLD COUNTRY-1428X | 1.4 | 13.0 | b-f | 55.4 | e-h |
| 11 | GOLD COUNTRY-1827X | 1.8 | 13.2 | bcd | 55.3 | e-h |
| 12 | LG SEEDS C1530R2 | 1.5 | 12.9 | efg | 61.5 | ab |
| 13 | LG SEEDS C1870R2 | 1.8 | 13.9 | a | 62.2 | ab |
| 14 | LEGEND SEEDS LS-1422N | 1.4 | 12.9 | fg | 60.9 | abc |
| 15 | LEGEND SEEDS LS-16X932N | 1.6 | 12.9 | fg | 58.9 | b-e |
| 16 | NK S12R3 | 1.2 | 13.3 | b | 51.8 | hij |
| 17 | NK S14A6 | 1.4 | 12.8 | fg | 61.8 | ab |
| 18 | PRAIRIE BRAND PB-1376R2 | 1.3 | 13.3 | bc | 53.8 | ghi |
| 19 | PRAIRIE BRAND PB-1787R2 | 1.7 | 13.0 | d-g | 56.9 | d-g |
| 20 | STINE 14RD62 | 1.4 | 13.0 | d-g | 59.3 | bcd |
| 21 | STINE 15BA30 | 1.5 | 13.1 | b-f | 48.8 | j |
| 22 | TITAN PRO 15M22 | 1.5 | 12.9 | fg | 57.1 | c-g |
| 23 | TITAN PRO TP-18X97 | 1.8 | 12.8 | fg | 63.6 | a |
| LSD p=0.10 | 0.25 | 3.8 | ||||
| Grand mean | 13.0 | 56.7 | ||||
| Means followed by the same letter or symbol do not significantly differ at the p=0.10 level. | ||||||
Table 2. Early maturity (1.1-1.8) soybean yield results ranked by yield from Lawler farm, Rochester, MN. Soybeans were harvested October 18, 2018 and yields adjusted to 13 percent moisture.
| No. | Name | Maturity | Moisture (%) | Yield (bu/a) | ||
|---|---|---|---|---|---|---|
| 23 | TITAN PRO TP-18X97 | 1.8 | 12.8 | fg | 63.6 | a |
| 13 | LG SEEDS C1870R2 | 1.8 | 13.9 | a | 62.2 | ab |
| 17 | NK S14A6 | 1.4 | 12.8 | fg | 61.8 | ab |
| 12 | LG SEEDS C1530R2 | 1.5 | 12.9 | efg | 61.5 | ab |
| 14 | LEGEND SEEDS LS-1422N | 1.4 | 12.9 | fg | 60.9 | abc |
| 20 | STINE 14RD62 | 1.4 | 13.0 | d-g | 59.3 | bcd |
| 7 | DAHLMAN 6818XN | 1.8 | 12.8 | g | 59.1 | b-e |
| 15 | LEGEND SEEDS LS-16X932N | 1.6 | 12.9 | fg | 58.9 | b-e |
| 1 | AGRIGOLD G1502RX | 1.5 | 13.2 | b-e | 58.7 | b-f |
| 22 | TITAN PRO 15M22 | 1.5 | 12.9 | fg | 57.1 | c-g |
| 8 | DAIRYLAND DSR-1526/R2Y | 1.5 | 13.0 | efg | 56.9 | d-g |
| 19 | PRAIRIE BRAND PB-1787R2 | 1.7 | 13.0 | d-g | 56.9 | d-g |
| 3 | ASGROW AG11X8 | 1.1 | 12.8 | g | 55.6 | d-h |
| 10 | GOLD COUNTRY-1428X | 1.4 | 13.0 | b-f | 55.4 | e-h |
| 11 | GOLD COUNTRY-1827X | 1.8 | 13.2 | bcd | 55.3 | e-h |
| 2 | AGRIGOLD G1710RX | 1.7 | 12.9 | fg | 55.0 | f-i |
| 9 | DAIRYLAND DSR-1870/R2Y | 1.8 | 13.2 | b-e | 55.0 | f-i |
| 18 | PRAIRIE BRAND PB-1376R2 | 1.3 | 13.3 | bc | 53.8 | ghi |
| 5 | DAHLMAN 6713XN | 1.3 | 13.0 |
c-f
|
53.5 |
ghi
|
| 4 | ASGROW AG17X8 | 1.7 | 13.3 | bc | 52.1 | hij |
| 16 | NK S12R3 | 1.2 | 13.3 | b | 51.8 | hij |
| 6 | DAHLMAN 6815XN | 1.5 | 12.9 | fg | 51.4 | ij |
| 21 | STINE 15BA30 | 1.5 | 13.1 | b-f | 48.8 | j |
| LSD p=0.10 | 0.25 | 3.8 | ||||
| Grand mean | 13.0 | 56.7 | ||||
| Means followed by the same letter or symbol do not significantly differ at the p=0.10 level. | ||||||
Table 3. Late maturity (1.9-2.4) soybean yield results by entry number from Lawler farm, Rochester, MN. Soybeans were harvested October 18, 2018 and yields adjusted to 13 percent moisture.
| No. | Name | Maturity | Moisture (%) | Yield (bu/a) | ||
|---|---|---|---|---|---|---|
| 1 | AGRIGOLD G1990RX | 1.9 | 12.7 | ghi | 64.1 | ab |
| 2 | AGRIGOLD G2250RX | 2.2 | 12.9 | fg | 61.9 | a-d |
| 3 | ASGROW AG19X8 | 1.9 | 13.3 | bc | 61.3 | b-e |
| 4 | ASGROW AG21X8 | 2.1 | 13.4 | b | 57.2 | fgh |
| 5 | DAHLMAN 6721XN | 2.1 | 13.1 | cde | 58.0 | e-h |
| 6 | DAIRYLAND DSR-2110/R2Y | 2.1 | 12.9 | fg | 61.3 | b-e |
| 7 | DAIRYLAND DSR-2330/R2Y | 2.3 | 12.9 | ef | 61.8 | b-e |
| 8 | GOLD COUNTRY-2038X | 2.0 | 12.7 | hi | 64.0 | ab |
| 9 | GOLD COUNTRY-2138X | 2.1 | 12.9 | fgh | 61.8 | a-d |
| 10 | GOLDEN HARVEST G1915X | 1.9 | 13.0 | def | 62.1 | a-d |
| 11 | GOLDEN HARVEST G2230X | 2.2 | 12.6 | i | 63.6 | abc |
| 12 | LG SEEDS 2126RX | 2.1 | 13.3 | bc | 60.1 | c-f |
| 13 | LG SEEDS 2239RX | 2.2 | 12.7 | hi | 56.1 | gh |
| 14 | LEGEND SEEDS LS 20X963N | 2.0 | 12.7 | ghi | 64.4 | ab |
| 15 | LEGEND SEEDS LS 21X705N | 2.1 | 13.2 | cde | 55.1 | h |
| 16 | PRAIRIE BRAND PB-1956R2 | 1.9 | 13.0 | ef | 59.4 | d-g |
| 17 | PRAIRIE BRAND PB-2024R2 | 2.0 | 13.0 | ef | 63.8 | abc |
| 18 | STINE 19BA23 | 1.9 | 13.2 | bcd | 65.6 | a |
| 19 | STINE 20RD20 | 2.0 | 12.9 | fgh | 64.3 | ab |
| 20 | TITAN PRO TP-20R25 | 2.0 | 12.9 | ef | 59.2 | d-g |
| 21 | TITAN PRO TP-24X87 | 2.4 | 14.0 | a | 64.9 | ab |
| LSD p=0.10 | 0.2 | 3.8 | ||||
| Grand mean | 13.0 | 61.5 | ||||
| Means followed by the same letter or symbol do not significantly differ at the p=0.10 level. | ||||||
Table 4. Late maturity (1.9-2.4) soybean yield results ranked by yield from Lawler farm, Rochester, MN. Soybeans were harvested October 18, 2018 and yields adjusted to 13 percent moisture.
| No. | Name | Maturity | Moisture (%) | Yield (bu/a) | ||
|---|---|---|---|---|---|---|
| 18 | STINE 19BA23 | 1.9 | 13.2 | bcd | 65.6 | a |
| 21 | TITAN PRO TP-24X87 | 2.4 | 14.0 |
a
|
64.9 |
ab
|
| 14 | LEGEND SEEDS LS 20X963N | 2.0 | 12.7 | ghi | 64.4 | ab |
| 19 | STINE 20RD20 | 2.0 | 12.9 | fgh | 64.3 | ab |
| 1 | AGRIGOLD G1990RX | 1.9 | 12.7 | ghi | 64.1 | ab |
| 8 | GOLD COUNTRY-2038X | 2.0 | 12.7 | hi | 64.0 | ab |
| 17 | PRAIRIE BRAND PB-2024R2 | 2.0 | 13.0 |
ef
|
63.8 |
abc
|
| 11 | GOLDEN HARVEST G2230X | 2.2 | 12.6 | i | 63.6 | abc |
| 10 | GOLDEN HARVEST G1915X | 1.9 | 13.0 | def | 62.1 | a-d |
| 2 | AGRIGOLD G2250RX | 2.2 | 12.9 | fg | 61.9 | a-d |
| 7 | DAIRYLAND DSR-2330/R2Y | 2.3 | 12.9 | ef | 61.8 | b-e |
| 9 | GOLD COUNTRY-2138X | 2.1 | 12.9 | fgh | 61.8 | a-d |
| 3 | ASGROW AG19X8 | 1.9 | 13.3 | bc | 61.3 | b-e |
| 6 | DAIRYLAND DSR-2110/R2Y | 2.1 | 12.9 | fg | 61.3 | b-e |
| 12 | LG SEEDS 2126RX | 2.1 | 13.3 | bc | 60.1 | c-f |
| 16 | PRAIRIE BRAND PB-1956R2 | 1.9 | 13.0 | ef | 59.4 | d-g |
| 20 | TITAN PRO TP-20R25 | 2.0 | 12.9 | ef | 59.2 | d-g |
| 5 | DAHLMAN 6721XN | 2.1 | 13.1 | cde | 58.0 | e-h |
| 4 | ASGROW AG21X8 | 2.1 | 13.4 | b | 57.2 | fgh |
| 13 | LG SEEDS 2239RX | 2.2 | 12.7 | hi | 56.1 | gh |
| 15 | LEGEND SEEDS LS 21X705N | 2.1 | 13.2 | cde | 55.1 | h |
| LSD p=0.10 | 0.2 | 3.8 | ||||
| Grand mean | 13.0 | 61.5 | ||||
| Means followed by the same letter or symbol do not significantly differ at the p=0.10 level. | ||||||
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