The most extensive data on protein content of Ohio FG1 and Ohio FG2 derive from the Ohio Large Seeded Test Table 5), for which both protein and oil content were determined for four years, 1991-1994. The effect of production environment, chiefly weather, is shown in the year-to-year differences. Previous studies indicated that heat and drought stress during grain filling tend to reduce protein content. The data from Table 5 conform to this, because, generally, the lowest protein contents occurred during the unusually dry 1991 season, while the highest protein contents occurred in 1994, when there was adequate moisture. Despite year-to-year differences in absolute protein content, the relative ranks of varieties were similar in all years. Vinton 81 had the highest mean protein content overall, 0.8 to 1.0% greater than Ohio FG1 and Ohio FG2. Of the grain-type soybeans, only Century 84 and Burlison had higher protein contents than Ohio FG1 and Ohio FG2.
| Table 5. Protein and Oil content of selected entries in Ohio Large-Seeded Test 1992-1994 | ||||||
|---|---|---|---|---|---|---|
| Entry | Protein/Oil1 | |||||
| 19912 | 19922 | 19933 | 19942 | 3-year mean | 4-year mean | |
| Beeson 80 | 38.9 | 42.9 | 41.2 | 42.6 | 41.0 | 41.4 |
| 21.9 | 20.0 | 21.5 | 19.5 | 21.2 | 20.8 | |
| Vinton 81 | 41.0 | 43.3 | 44.1 | 44.4 | 43.0 | 43.3 |
| 21.5 | 20.1 | 20.8 | 19.5 | 20.8 | 20.5 | |
| Ohio FG1 | 40.3 | 42.8 | 42.6 | 43.5 | 42.0 | 42.3 |
| 21.8 | 20.6 | 21.3 | 20.1 | 21.2 | 21.0 | |
| Ohio FG2 | 41.4 | 42.8 | 42.5 | 43.1 | 42.2 | 42.5 |
| 21.4 | 20.3 | 21.4 | 19.7 | 21.1 | 20.8 | |
| Chapman | 40.3 | 41.8 | 41.0 | 42.4 | 41.0 | 41.3 |
| 22.1 | 21.0 | 23.0 | 20.8 | 22.2 | 21.9 | |
| Conrad | 39.4 | 40.7 | 40.2 | 40.9 | 40.1 | 40.3 |
| 21.9 | 20.4 | 22.4 | 20.1 | 21.7 | 21.3 | |
| Flyer | 41.4 | 41.6 | 42.4 | 42.8 | 41.9 | 42.1 |
| 21.4 | 20.7 | 20.8 | 20.1 | 20.9 | 20.8 | |
| Resnik | 40.1 | 41.4 | 42.1 | 42.9 | 41.3 | 41.7 |
| 21.5 | 20.7 | 21.0 | 20.7 | 21.1 | 21.0 | |
| Thorne | 39.8 | 42.1 | 42.4 | 42.9 | 41.6 | 41.9 |
| 22.2 | 20.8 | 21.2 | 20.1 | 21.4 | 21.1 | |
| Burlison | 42.4 | 43.6 | 42.2 | -- | 42.7 | -- |
| 20.3 | 19.3 | 20.7 | -- | 20.2 | -- | |
| Century 84 | 41.1 | 44.3 | 43.1 | -- | 42.9 | -- |
| 21.1 | 19.6 | 20.8 | -- | 20.5 | -- | |
| Keller | 39.1 | 42.7 | 41.1 | -- | 41.0 | -- |
| 22.0 | 20.0 | 21.5 | -- | 21.2 | -- | |
| LSD (0.30) | 0.4 | 0.4 | ||||
| 0.3 | 0.3 | |||||
| 1protein on upper line, oil on lower line; both expressed on dryweight basis (multiply by 0.87 to convert to 13% moisture basis). | ||||||
Generally, the varieties highest in protein are lowest in oil content, and vice versa. This trend was apparent in the 1991-94 data (Table 5), but exceptions occurred. Mean oil content of Ohio FG1 and Ohio FG2 was similar to that of most grain-type varieties.
Seed samples of several varieties were obtained from two test locations in 1992 and three in 1993 for production and analysis of experimental quantities of soymilk. Both soymilk solids content and soymilk protein content were measured on these samples.
Soymilk solids content was strongly influenced by the environment in which the soybeans were produced" (Table 6 ). The poorest values wereobtained at South Charleston in 1992, the best values ar Hoytville in 1993. It is not known which specific environmental factors were responsible for these differences.
Table 6 also reveals that the relative rank of varieties for soymilk solids content varied with the production environment. Vinton 81 was significantly better than Ohio FG1 and Ohio FG2 at South Charleston in 1992 and at Hoytville in 1993, but one or both of the new varieties outperformed Vinton 81 in the other three environments. Ohio FG2 had substantially greater solids content than Ohio FG1 at Lakeview in 1993, but this large advantage did not appear at other sites. The grain-type variety 'Sandusky' had a low solids content in the one test where it was included. Averaged over all environments, the soymilk solids contents of Ohio FG1, Ohio FG2, Vinton 81, and Beeson 80 (included in 1992 only) were similar.
| Table 6. Soymilk solids content of soybean varieties, 1992-1993. | ||||||
|---|---|---|---|---|---|---|
| Soymilk solids content | ||||||
| 1992 Hoytville % | 1992 S. Charleston % |
1993 Hoytville % | 1993 Lakeview % | 1993 S. Charleston % | Mean % | |
| Beeson 80 | 6.86 | 6.72 | - | - | - | - |
| Vinton 81 | 6.88 | 6.78 | 7.18 | 6.92 | 6.88 | 6.93 |
| Ohio FG1 | 6.95 | 6.69 | 7.04 | 6.84 | 7.08 | 6.92 |
| Ohio FG2 | 6.85 | 6.70 | 7.10 | 7.20 | 7.01 | 6.97 |
| Sandusky | - | - | - | - | 6.82 | - |
| LSD (0.30) | 0.04 | 0.04 | 0.04 | 0.04 | 0.04 | ns |
Environmental influences also occurred for soymilk protein content (Table 7). Vinton 81 had a greater soymilk protein content than Ohio FG1 and Ohio FG2 in three of the five test environments. The two new varieties were similar to Beeson 80 in one 1992 test but inferior in the other. Sandusky again had the lowest recorded value. Overall, Ohio FG1 and Ohio FG2 had similar mean soymilk protein contents, both less than the mean of Vinton 81.
| Table 7. Soymilk protein content of soybean varieties, 1992-1993. | ||||||
|---|---|---|---|---|---|---|
| Soymilk solids content | ||||||
| 1992 Hoytville % | 1992 S. Charleston % |
1993 Hoytville % | 1993 Lakeview % | 1993 S. Charleston % | Mean % | |
| Beeson 80 | 3.34 | 3.51 | - | - | - | - |
| Vinton 81 | 3.37 | 3.45 | 3.62 | 3.65 | 3.63 | 3.54 |
| Ohio FG1 | 3.39 | 3.35 | 3.26 | 3.48 | 3.65 | 3.42 |
| Ohio FG2 | 3.36 | 3.33 | 3.39 | 3.57 | 3.56 | 3.44 |
| Sandusky | - | - | - | - | 3.19 | - |
| LSD (0.30) | 0.05 | 0.05 | 0.05 | 0.04 | 0.05 | ns |