MINNEAPOLIS — Performance comparisons of early (1.2-1.8) and late (1.9-2.3) maturity glyphosate tolerant/RoundUp Ready soybean in southeastern Minnesota are now available. The studies with 30 early-maturity and 30 late-maturity entries were conducted near Rochester, MN (Lawler site) on a Port Byron silt loam. Trials were planted on May 12, 2017 with a 4-row John Deere 7000 planter equipped with cone units. The seeding rate was 150,000 seeds per acre with seed planted at a depth of 1.5 inches in 30 inch rows. Plots were four rows wide by 22 feet in length and the center two rows of each plot were machine harvested on October 20, 2017.
Power in study design
The power of our research is that we replicate the trial to help take out effects due to variability across the field (e.g. soil type, drainage, topography, etc.). Each variety is randomly placed into each block (replication) and this is called a randomized complete block design. In our study, we used four blocks (replications), which is considered the standard for field research. In the tables that follow, moisture and yield results followed by the same letter are 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 plots, and Y more than X in the others, these likely would come out statistically the same. In another example, variety X may outyield 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 the P = 0.10, this indicates that 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 that 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 On-farm research.
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 68.4 bu/a with a range of 74.1 – 63.4 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 67.0 bu/a with a range of 71.5 – 61.9 bu/a.
Note in Table 2 (listed by rank): The highest yielding entries have the letter “a” after the yield value. NORTHRUP KING S14-A6 has a yield of 74.1 bu/a followed by the letter “a”. All other entries with the letter “a” after the yield value are statistically the same as NORTHRUP KING S14-A6.
Many of the entries/varieties performed very well and there are not big differences. Yield is one of the primary things to consider when choosing a variety. However, take time to evaluate other replicated, reliable trial results for consistency of a variety’s performance. Also, evaluate other key agronomic traits such as maturity, SCN, disease scores, etc. when choosing varieties for your farm. Stay tuned for more updates. (University of Minnesota Extension Regional Office, Rochester, and Southern Research and Outreach Center, Waseca, MN).
Table 1. Early maturity (1.2-1.8) soybean yield results (13% moisture) by entry number from Lawler farm, Rochester, MN, harvested October 20, 2017.
No | Entry name | Maturity | Herbicide trait | Moisture | Yield | ||
---|---|---|---|---|---|---|---|
percent (%) | bu/a | ||||||
1 | AGRIGOLD G1810RX | 1.8 | Xtend | 10.6 | – | 65.1 | i-l |
2 | AGRIGOLD G1850RX | 1.8 | Xtend | 10.5 | – | 63.4 | l |
3 | ASGROW AG12X6** | 1.2 | Xtend | 10.6 | – | 64.6 | jkl |
4 | ASGROW AG1435 | 1.4 | Glyphosate | 10.5 | – | 69.1 | c-h |
5 | ASGROW AG1636 | 1.6 | Glyphosate | 10.6 | – | 67.9 | e-j |
6 | CROPLAN R2C1400 | 1.4 | Glyphosate | 10.5 | – | 72.1 | abc |
7 | CROPLAN R2C1760 | 1.7 | Glyphosate | 10.7 | – | 66.1 | g-l |
8 | DAHLMAN 6713XN | 1.3 | Xtend | 10.6 | – | 65.9 | h-l |
9 | DAHLMAN 6815XN | 1.5 | Xtend | 10.7 | – | 72.9 | ab |
10 | DAIRYLAND DSR-1526/R2Y | 1.5 | Glyphosate | 10.5 | – | 69.4 | c-g |
11 | DAIRYLAND DSR-1870/R2Y | 1.8 | Glyphosate | 10.6 | – | 69.9 | b-e |
12 | GOLD COUNTRY 1337X | 1.3 | Xtend | 10.7 | – | 64.8 | jkl |
13 | GOLD COUNTRY 1814 | 1.8 | Glyphosate | 10.7 | – | 69.8 | b-f |
14 | LEGEND SEEDS LS-17X802N | 1.4 | Xtend | 10.6 | – | 71.5 | a-d |
15 | LEGEND SEEDS LS-17R500 | 1.8 | Glyphosate | 10.8 | – | 67.6 | e-k |
16 | NORTHSTAR GENETICS NS01528NR2** | 1.5 | Glyphosate | 10.6 | – | 72.0 | abc |
17 | NORTHSTAR GENETICS NS 1776NR2** | 1.7 | Glyphosate | 10.7 | – | 65.6 | h-l |
18 | NORTHRUP KING S12-R3 | 1.2 | Glyphosate | 10.8 | – | 70.1 | b-e |
19 | NORTHRUP KING S14-A6 | 1.4 | Glyphosate | 10.7 | – | 74.1 | a |
20 | PIONEER BRAND P12A59X | 1.2 | Xtend | 10.3 | – | 64.3 | kl |
21 | PIONEER BRAND P15T46R2 | 1.5 | Glyphosate | 10.8 | – | 66.4 | f-l |
22 | PRAIRIE BRAND 1787R2 | 1.7 | Glyphosate | 10.5 | – | 68.5 | d-i |
23 | PRAIRIE BRAND 1376R2 | 1.3 | Glyphosate | 10.6 | – | 69.8 | b-e |
24 | PRODUCERS HYBRIDS 1816NRX | 1.8 | Xtend | 10.7 | – | 65.6 | i-l |
25 | RENK RS147NR2 | 1.4 | Glyphosate | 10.6 | – | 68.5 | d-i |
26 | RENK RS187NR2 | 1.8 | Glyphosate | 10.7 | – | 69.9 | b-e |
27 | STINE 13R132 | 1.3 | Glyphosate | 10.5 | – | 70.9 | a-e |
28 | STINE 14RD62 | 1.4 | Glyphosate | 10.7 | – | 67.9 | e-j |
29 | TITAN PRO TP-16X77 | 1.6 | Xtend | 10.7 | – | 72.1 | abc |
30 | TITAN PRO TP-18X97 | 1.8 | Xtend | 10.7 | – | 66.0 | g-l |
LSD p=0.10 | NS | 3.4 | |||||
Grand mean | 10.6 | 68.4 | |||||
**Committee entry Means followed by the same letter are not significantly different at the p=0.10 level |
Table 2. Early maturity (1.2-1.8) soybean yield results (13% moisture) ranked by yield from Lawler farm, Rochester, MN, harvested October 20, 2017.
No | Entry name | Maturity | Herbicide trait | Moisture | Yield | ||
---|---|---|---|---|---|---|---|
percent (%) | bu/a | ||||||
19 | NORTHRUP KING S14-A6 | 1.4 | Glyphosate | 10.7 | – | 74.1 | a |
9 | DAHLMAN 6815XN | 1.5 | Xtend | 10.7 | – | 72.9 | ab |
6 | CROPLAN R2C1400 | 1.4 | Glyphosate | 10.5 | – | 72.1 | abc |
29 | TITAN PRO TP-16X77 | 1.6 | Xtend | 10.7 | – | 72.1 | abc |
16 | NORTHSTAR GENETICS NS01528NR2** | 1.5 | Glyphosate | 10.6 | – | 72.0 | abc |
14 | LEGEND SEEDS LS-17X802N | 1.4 | Xtend | 10.6 | – | 71.5 | a-d |
27 | STINE 13R132 | 1.3 | Glyphosate | 10.5 | – | 70.9 | a-e |
18 | NORTHRUP KING S12-R3 | 1.2 | Glyphosate | 10.8 | – | 70.1 | b-e |
11 | DAIRYLAND DSR-1870/R2Y | 1.8 | Glyphosate | 10.6 | – | 69.9 | b-e |
26 | RENK RS187NR2 | 1.8 | Glyphosate | 10.7 | – | 69.9 | b-e |
13 | GOLD COUNTRY 1814 | 1.8 | Glyphosate | 10.7 | – | 69.8 | b-f |
23 | PRAIRIE BRAND 1376R2 | 1.3 | Glyphosate | 10.6 | – | 69.8 | b-e |
10 | DAIRYLAND DSR-1526/R2Y | 1.5 | Glyphosate | 10.5 | – | 69.4 | c-g |
4 | ASGROW AG1435 | 1.4 | Glyphosate | 10.5 | – | 69.1 | c-h |
22 | PRAIRIE BRAND 1787R2 | 1.7 | Glyphosate | 10.5 | – | 68.5 | d-i |
25 | RENK RS147NR2 | 1.4 | Glyphosate | 10.6 | – | 68.5 | d-i |
5 | ASGROW AG1636 | 1.6 | Glyphosate | 10.6 | – | 67.9 | e-j |
28 | STINE 14RD62 | 1.4 | Glyphosate | 10.7 | – | 67.9 | e-j |
15 | LEGEND SEEDS LS-17R500 | 1.8 | Glyphosate | 10.8 | – | 67.6 | e-k |
21 | PIONEER BRAND P15T46R2 | 1.5 | Glyphosate | 10.8 | – | 66.4 | f-l |
7 | CROPLAN R2C1760 | 1.7 | Glyphosate | 10.7 | – | 66.1 | g-l |
30 | TITAN PRO TP-18X97 | 1.8 | Xtend | 10.7 | – | 66.0 | g-l |
8 | DAHLMAN 6713XN | 1.3 | Xtend | 10.6 | – | 65.9 | h-l |
17 | NORTHSTAR GENETICS NS 1776NR2** | 1.7 | Glyphosate | 10.7 | – | 65.6 | h-l |
24 | PRODUCERS HYBRIDS 1816NRX | 1.8 | Xtend | 10.7 | – | 65.6 | i-l |
1 | AGRIGOLD G1810RX | 1.8 | Xtend | 10.6 | – | 65.1 | i-l |
12 | GOLD COUNTRY 1337X | 1.3 | Xtend | 10.7 | – | 64.8 | jkl |
3 | ASGROW AG12X6** | 1.2 | Xtend | 10.6 | – | 64.6 | jkl |
20 | PIONEER BRAND P12A59X | 1.2 | Xtend | 10.3 | – | 64.3 | kl |
2 | AGRIGOLD G1850RX | 1.8 | Xtend | 10.5 | – | 63.4 | l |
LSD p=0.10 | NS | 3.4 | |||||
Grand mean | 10.6 | 68.4 | |||||
**Committee entry Means followed by the same letter are not significantly different at the p=0.10 level |
Table 3. Late maturity (1.9-2.3) soybean yield results (13% moisture) by entry number from Lawler farm, Rochester, MN, harvested October 20, 2017.
No. | Entry name | Maturity | Herbicide trait | Moisture | Yield | ||
---|---|---|---|---|---|---|---|
percent (%) | bu/a | ||||||
1 | AGRIGOLD G2105RX | 2.1 | Xtend | 10.5 | a-e | 66.5 | c-i |
2 | AGRIGOLD G2355RX | 2.3 | Xtend | 10.5 | a-e | 63.0 | hij |
3 | ASGROW 21X7 | 2.1 | Xtend | 10.6 | a-d | 71.5 | a |
4 | ASGROW AG2336 | 2.3 | Glyphosate | 10.5 | a-e | 67.5 | a-h |
5 | ASGROW 2035 | 2.0 | Glyphosate | 10.6 | abc | 65.3 | e-j |
6 | CROPLAN R2C1950 | 1.9 | Glyphosate | 10.4 | b-f | 67.4 | a-h |
7 | CROPLAN R2C2025 | 2.0 | Glyphosate | 10.6 | abc | 66.9 | b-i |
8 | DAHLMAN 6721XN | 2.0 | Xtend | 10.4 | b-f | 71.2 | ab |
9 | DAHLMAN 6820XN | 2.0 | Xtend | 10.7 | a | 63.3 | g-j |
10 | DAIRYLAND DSR-2110/R2Y | 2.1 | Glyphosate | 10.5 | a-e | 63.4 | f-j |
11 | DAIRYLAND DSR-2330/R2Y | 2.3 | Glyphosate | 10.6 | ab | 65.4 | d-j |
12 | GOLD COUNTRY 2026X | 2.0 | Xtend | 10.4 | d-g | 66.9 | a-i |
13 | NORTHSTAR GENETICS 2031NR2** | 2.0 | Glyphosate | 10.5 | b-f | 67.6 | a-g |
14 | GOLD COUNTRY 2227X | 2.2 | Xtend | 10.6 | abc | 66.8 | b-i |
15 | LEGEND SEEDS LS 20R524N | 2.0 | Glyphosate | 10.3 | fgh | 62.7 | ij |
16 | LEGEND SEEDS LS 21X705N | 2.1 | Xtend | 10.5 | a-e | 69.2 | a-e |
17 | NORTHRUP KING S20T6** | 2.0 | Glyphosate | 10.2 | gh | 70.1 | abc |
18 | GOLDEN HARVEST GH 1915X | 1.9 | Xtend | 10.5 | b-f | 70.7 | abc |
19 | GOLDEN HARVEST GH 2230X | 2.2 | Xtend | 10.4 | d-g | 68.8 | a-e |
20 | PIONEER BRAND P19T39R2 | 1.9 | Glyphosate | 10.6 | abc | 61.9 | j |
21 | PIONEER BRAND P22T73R | 2.2 | Glyphosate | 10.6 | abc | 67.1 | a-i |
22 | PRAIRIE BRAND 1956R2 | 1.9 | Glyphosate | 10.5 | b-f | 67.4 | a-h |
23 | PRAIRIE BRAND 2024R2 | 2.0 | Glyphosate | 10.5 | b-f | 67.2 | a-i |
24 | TITAN PRO TP21X46 | 2.1 | Xtend | 10.4 | efg | 69.0 | a-e |
25 | PRODUCERS HYBRIDS 2316NRX | 2.3 | Xtend | 10.4 | b-f | 65.0 | e-j |
26 | RENK RS195NR2 | 1.9 | Glyphosate | 10.6 | abc | 70.6 | abc |
27 | RENK RS213NR2 | 2.1 | Glyphosate | 10.4 | c-f | 66.9 | b-i |
28 | STINE 19RF32** | 1.9 | Glyphosate | 10.6 | abc | 63.4 | f-j |
29 | STINE 19BA23 | 1.9 | Glyphosate | 10.5 | b-f | 69.9 | a-d |
30 | STINE 21R132 | 2.1 | Glyphosate | 10.1 | h | 67.9 | a-f |
LSD p=0.10 | 0.2 | 4.6 | |||||
Grand mean | 10.5 | 67.0 | |||||
**Committee entry Means followed by the same letter are not significantly different at the p=0.10 level |
Table 4. Late maturity (1.9-2.3) soybean yield results (13% moisture) ranked by yield from Lawler farm, Rochester, MN, harvested October 20, 2017.
No. | Entry name | Maturity | Herbicide trait | Moisture | Yield | ||
---|---|---|---|---|---|---|---|
percent (%) | bu/a | ||||||
3 | ASGROW 21X7 | 2.1 | Xtend | 10.6 | a-d | 71.5 | a |
8 | DAHLMAN 6721XN | 2.0 | Xtend | 10.4 | b-f | 71.2 | ab |
18 | GOLDEN HARVEST GH 1915X | 1.9 | Xtend | 10.5 | b-f | 70.7 | abc |
26 | RENK RS195NR2 | 1.9 | Glyphosate | 10.6 | abc | 70.6 | abc |
17 | NORTHRUP KING S20T6** | 2.0 | Glyphosate | 10.2 | gh | 70.1 | abc |
29 | STINE 19BA23 | 1.9 | Glyphosate | 10.5 | b-f | 69.9 | a-d |
16 | LEGEND SEEDS LS 21X705N | 2.1 | Xtend | 10.5 | a-e | 69.2 | a-e |
24 | TITAN PRO TP21X46 | 2.1 | Xtend | 10.4 | efg | 69.0 | a-e |
19 | GOLDEN HARVEST GH 2230X | 2.2 | Xtend | 10.4 | d-g | 68.8 | a-e |
30 | STINE 21R132 | 2.1 | Glyphosate | 10.1 | h | 67.9 | a-f |
13 | NORTHSTAR GENETICS 2031NR2** | 2.0 | Glyphosate | 10.5 | b-f | 67.6 | a-g |
4 | ASGROW AG2336 | 2.3 | Glyphosate | 10.5 | a-e | 67.5 | a-h |
6 | CROPLAN R2C1950 | 1.9 | Glyphosate | 10.4 | b-f | 67.4 | a-h |
22 | PRAIRIE BRAND 1956R2 | 1.9 | Glyphosate | 10.5 | b-f | 67.4 | a-h |
23 | PRAIRIE BRAND 2024R2 | 2.0 | Glyphosate | 10.5 | b-f | 67.2 | a-i |
21 | PIONEER BRAND P22T73R | 2.2 | Glyphosate | 10.6 | abc | 67.1 | a-i |
12 | GOLD COUNTRY 2026X | 2.0 | Xtend | 10.4 | d-g | 66.9 | a-i |
7 | CROPLAN R2C2025 | 2.0 | Glyphosate | 10.6 | abc | 66.9 | b-i |
27 | RENK RS213NR2 | 2.1 | Glyphosate | 10.4 | c-f | 66.9 | b-i |
14 | GOLD COUNTRY 2227X | 2.2 | Xtend | 10.6 | abc | 66.8 | b-i |
1 | AGRIGOLD G2105RX | 2.1 | Xtend | 10.5 | a-e | 66.5 | c-i |
11 | DAIRYLAND DSR-2330/R2Y | 2.3 | Glyphosate | 10.6 | ab | 65.4 | d-j |
5 | ASGROW 2035 | 2.0 | Glyphosate | 10.6 | abc | 65.3 | e-j |
25 | PRODUCERS HYBRIDS 2316NRX | 2.3 | Xtend | 10.4 | b-f | 65.0 | e-j |
10 | DAIRYLAND DSR-2110/R2Y | 2.1 | Glyphosate | 10.5 | a-e | 63.4 | f-j |
28 | STINE 19RF32** | 1.9 | Glyphosate | 10.6 | abc | 63.4 | f-j |
9 | DAHLMAN 6820XN | 2.0 | Xtend | 10.7 | a | 63.3 | g-j |
2 | AGRIGOLD G2355RX | 2.3 | Xtend | 10.5 | a-e | 63.0 | hij |
15 | LEGEND SEEDS LS 20R524N | 2.0 | Glyphosate | 10.3 | fgh | 62.7 | ij |
20 | PIONEER BRAND P19T39R2 | 1.9 | Glyphosate | 10.6 | abc | 61.9 | j |
LSD p=0.10 | 0.2 | 4.6 | |||||
Grand mean | 10.5 | 67.0 | |||||
**Committee entry Means followed by the same letter are not significantly different at the p=0.10 level |
— Lisa Behnken, Fritz Breitenbach, Liz Stahl, and Ryan Miller, University of Minnesota Extension
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