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Extension > Minnesota Crop News > U of M SE Minnesota Regional Soybean Yield Results now Available

Thursday, October 20, 2016

U of M SE Minnesota Regional Soybean Yield Results now Available

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

Performance comparisons of early (1.3-1.8) and late (1.9-2.4) maturity glyphosate tolerant/RoundUp Ready soybean in southeastern Minnesota are now available. The studies with 24 early-maturity and 25 late-maturity entries were conducted near Rochester, MN (Lawler site) on a Port Byron silt loam. Trials were planted on May 5, 2016 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 4, 2016.

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 that are followed by the same letter, we would not expect to see a difference in yield in the field. Even though the average yield for a couple of varieties may be numerically different by a few bushels, there was enough variability in the yields across replications that no real trend could be found. 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 3 replications. Here again, these likely would not be statistically different, although the average yields may come out numerically different.

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. When there is more variability in yield across a plot, the LSD value will go up. 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 that variety X performs better than variety Y if the yield difference is equal to or greater than the LSD. Likewise, if P = .20, we 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 are considered standards.

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 76.3 bu/a with a range of 81.0 – 71.4 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 77.4 bu/a with a range of 83.4 – 64.1 bu/a.

Note in Table 2 (listed by rank): The highest yielding entries have the letter "a" after the yield value. RENK RS153NR2 has a yield of 81.0 bu/a followed by the letter "a". All other entries with the letter "a" after the yield value are statistically the same as RENK RS153NR2.

Some entries have more than one letter, like "ab" or "a-d." What does this mean? Entries with the same letter(s) following the yield are not statistically different from each other. For example, STINE 14RD62 has a yield of 77.9 followed by the letters "a-d." This means that the STINE 14RD62 yield of 77.9 is statistically the same as the RENK RS153 NR2 with 81.0 bu/A (both have the letter "a" after the yield). It also means that the STINE 14RD62 yield of 77.9 is not statistically different from all entries followed by an "a, b, c, or d." Therefore, it's not statistically different than LEGEND 17R654N at 74.1 bu/A, which is followed by letters "def," because both yields values are followed by the letter “d.”

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 and also consider 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 (1.3-1.8) soybean yield results (13% moisture) by entry number from Lawler farm, Rochester, MN, harvested October 4, 2016.
No. Entry name Maturity Moisture Yield
percent (%) bu/a
1 Asgrow AG1636 1.6 12.9 ab 76.1 b-f
2 Asgrow AG1733 1.7 12.5 cd 75.4 c-f
3 Bayer CZ1787RY 1.7 12.5 c 75.6 b-f
4 Croplan R2C1572 1.5 12.6 c 77.9 a-d
5 Dahlman 5215NRR2Y 1.5 12.6 bc 76.8 a-e
6 Dairyland DSR-1526/R2Y 1.5 12.5 c 75.4 c-f
7 Dairyland DSR-1870/R2Y 1.8 12.6 c 77.7 a-d
8 Gold Country 1814 1.8 12.5 c 79.7 abc
9 Legend 13R700N 1.3 12.6 c 75.3 c-f
10 Legend 17R654N 1.7 12.3 d 74.1 def
11 Mycogen Seeds 5N145R2 1.4 12.7 abc 72.3 ef
12 Mycogen Seeds 5N182R2 1.8 12.6 bc 75.0 c-f
13 NK Brand 13H5 1.3 12.7 bc 75.2 c-f
14 NK Brand S14A6 1.4 12.7 bc 79.7 abc
15 Pioneer Brand 15T46R2 1.5 12.7 bc 71.4 f
16 Pioneer Brand 18T26R2 1.8 12.6 c 75.7 b-f
17 Prairie Brand PB-1376R2 1.3 12.7 abc 72.5 ef
18 Prairie Brand PB-1787R2 1.7 12.5 cd 78.8 a-d
19 Renk RS153NR2 1.5 12.6 c 81.0 a
20 Renk RS175NR2 1.7 12.9 a 75.2 c-f
21 Stine 14RD62 1.4 12.5 c 77.9 a-d
22 Stine 17RF26 1.7 12.9 a 74.2 def
23 NorthStar Genetics NS 1528NR2 1.5 12.6 c 80.2 ab
24 NorthStar Genetics NS 1776NR 1.7 12.5 c 77.3 a-d
LSD (p=0.10) 0.2 4.7
Grand mean 12.6 76.3
Means followed by the same letter are not significantly different at the p=0.10 level

Table 2. Early maturity (1.3-1.8) soybean yield results (13% moisture) ranked from Lawler farm, Rochester, MN, harvested October 4, 2016.
No. Entry name Maturity Moisture Yield
percent (%) bu/a
19 Renk RS153NR2 1.5 12.6 c 81.0 a
23 NorthStar Genetics NS 1528NR2 1.5 12.6 c 80.2 ab
8 Gold Country 1814 1.8 12.5 c 79.7 abc
14 NK Brand S14A6 1.4 12.7 bc 79.7 abc
18 Prairie Brand PB-1787R2 1.7 12.5 cd 78.8 a-d
4 Croplan R2C1572 1.5 12.6 c 77.9 a-d
21 Stine 14RD62 1.4 12.5 c 77.9 a-d
7 Dairyland DSR-1870/R2Y 1.8 12.6 c 77.7 a-d
24 NorthStar Genetics NS 1776NR 12.5 c 77.3 a-d
5 Dahlman 5215NRR2Y 1.5 12.6 bc 76.8 a-e
1 Asgrow AG1636 1.6 12.9 ab 76.1 b-f
16 Pioneer Brand 18T26R2 1.8 12.6 c 75.7 b-f
3 Bayer CZ1787RY 1.7 12.5 c 75.6 b-f
2 Asgrow AG1733 1.7 12.5 cd 75.4 c-f
6 Dairyland DSR-1526/R2Y 1.5 12.5 c 75.4 c-f
9 Legend 13R700N 1.3 12.6 c 75.3 c-f
13 NK Brand 13H5 1.3 12.7 bc 75.2 c-f
20 Renk RS175NR2 1.7 12.9 a 75.2 c-f
12 Mycogen Seeds 5N182R2 1.8 12.6 bc 75.0 c-f
22 Stine 17RF26 1.7 12.9 a 74.2 def
10 Legend 17R654N 1.7 12.3 d 74.1 def
17 Prairie Brand PB-1376R2 1.3 12.7 abc 72.5 ef
11 Mycogen Seeds 5N145R2 1.4 12.7 abc 72.3 ef
15 Pioneer Brand 15T46R2 1.5 12.7 bc 71.4 f
LSD (p=0.10) 0.2 4.7
Grand mean 12.6 76.3
Means followed by the same letter are not significantly different at the p=0.10 level

Table 3. Late maturity (1.9-2.4) soybean yield results (13% moisture) by entry number from Lawler farm, Rochester, MN, harvested October 4, 2016.
No. Entry name Maturity Moisture Yield
percent (%) bu/a
1 Asgrow AG1935 1.9 12.3 d-i 74.9 def
2 Asgrow AG2035 2.0 12.3 b-i 78.5 a-f
3 Bayer CZ2474RY 2.4 12.7 a 64.1 g
4 Croplan R2C1950 1.9 12.3 b-h 81.7 ab
5 Dairyland DSR-2110/R2Y 2.1 12.4 bcd 73.6 f
6 Dairyland DSR-2330/R2Y 2.3 12.3 b-g 80.1 abc
7 Gold Country 2114 2.1 12.2 f-i 77.7 b-f
8 Legend 20R524N 2.0 12.3 b-i 80.1 abc
9 Legend 21R635N 2.1 12.4 bc 75.7 c-f
10 Mycogen Seeds 5N194R2 1.9 12.4 b-f 77.4 b-f
11 Mycogen Seeds 5N206R2 2.0 12.5 b 74.7 ef
12 NK Brand S20T6 2.0 12.0 j 83.2 a
13 NK Brand S21M7 2.1 12.0 j 75.5 c-f
14 Pioneer Brand 19T39R2 1.9 12.4 b-e 74.1 f
15 Pioneer Brand 22T73 2.2 12.4 c-i 77.2 b-f
16 Prairie Brand PB-1956R2 1.9 12.4 d-i 77.8 b-f
17 Prairie Brand PB-2197R2 2.1 12.3 ghi 78.6 a-f
18 Producers Hybrids 1905NR2 1.9 12.3 c-i 83.4 a
19 Producers Hybrids 2204NR2 2.2 12.2 ghi 80.0 a-d
20 Renk RS195NR2 1.9 12.2 e-i 79.7 a-e
21 Renk RS213NR2 2.1 12.1 ij 76.8 b-f
22 Stine 19RF32 1.9 12.3 b-h 79.5 a-e
23 Stine 20RD20 2.0 12.2 hij 76.0 c-f
24 NorthStar Genetics NS 2031NR2 2.0 12.3 b-g 79.9 a-d
25 NorthStar Genetics NS 2362NR2 2.3 12.4 bcd 75.3 c-f
LSD (p=0.10) 0.2 5.2
Grand mean 12.3 77.4
Means followed by the same letter are not significantly different at the p=0.10 level

Table 4. Late maturity (1.9-2.4) soybean yield results (13% moisture) ranked from Lawler farm, Rochester, MN, harvested October 4, 2016.
No. Entry name Maturity Moisture Yield
percent (%) bu/a
18 Producers Hybrids 1905NR2 1.9 12.3 c-i 83.4 a
12 NK Brand S20T6 2.0 12.0 j 83.2 a
4 Croplan R2C1950 1.9 12.3 b-h 81.7 ab
6 Dairyland DSR-2330/R2Y 2.3 12.3 b-g 80.1 abc
8 Legend 20R524N 2.0 12.3 b-i 80.1 abc
19 Producers Hybrids 2204NR2 2.2 12.2 ghi 80.0 a-d
24 NorthStar Genetics NS 2031NR2 2.0 12.3 b-g 79.9 a-d
20 Renk RS195NR2 1.9 12.2 e-i 79.7 a-e
22 Stine 19RF32 1.9 12.3 b-h 79.5 a-e
17 Prairie Brand PB-2197R2 2.1 12.3 ghi 78.6 a-f
2 Asgrow AG2035 2.0 12.3 b-i 78.5 a-f
16 Prairie Brand PB-1956R2 1.9 12.4 d-i 77.8 b-f
7 Gold Country 2114 2.1 12.2 f-i 77.7 b-f
10 Mycogen Seeds 5N194R2 1.9 12.4 b-f 77.4 b-f
15 Pioneer Brand 22T73 2.2 12.4 c-i 77.2 b-f
21 Renk RS213NR2 2.1 12.1 ij 76.8 b-f
23 Stine 20RD20 2.0 12.2 hij 76.0 c-f
9 Legend 21R635N 2.1 12.4 bc 75.7 c-f
13 NK Brand S21M7 2.1 12.0 j 75.5 c-f
25 NorthStar Genetics NS 2362NR2 2.3 12.4 bcd 75.3 c-f
1 Asgrow AG1935 1.9 12.3 d-i 74.9 def
11 Mycogen Seeds 5N206R2 2.0 12.5 b 74.7 ef
14 Pioneer Brand 19T39R2 1.9 12.4 b-e 74.1 f
5 Dairyland DSR-2110/R2Y 2.1 12.4 bcd 73.6 f
3 Bayer CZ2474RY 2.4 12.7 a 64.1 g
LSD (p=0.10) 0.2 5.2
Grand mean 12.3 77.4
Means followed by the same letter are not significantly different at the p=0.10 level

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