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2018 U of M SE Minnesota regional soybean yield results available

by Lisa Behnken, Ryan Miller, Liz Stahl and Fritz Breitenbach

Soybean variety trials in Rochester, MN
Performance comparisons of early (1.1-1.8) and late (1.9-2.4) maturity glyphosate and or dicamba tolerant soybean in southeastern Minnesota are now available. Yields for 23 early-maturity entries ranged from 48.8 to 63.6 bushels per acre and from 55.1 to 64.4 bu/a for the 21 late- maturity entries.

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.
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 TITON PRO 15M22 1.5 12.9 fg 57.1 c-g
23 TITON 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 TITON 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 TITON 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 TITON 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 TITON 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 TITON 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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