Scientific Name: Glycine max
Family: Leguminosae (Legume)
Flower Colors: Purple, white
Seed Colors: Yellow, brown, black green, bicolored, variegated
Hilum Colors: Buff (colorless), black, imperfect black, brown
Pubescence Colors: Tawny (golden brown), gray
Plant Height: 20 inches to 50 inches (varies by variety and environmental conditions)
Pod Number: 0 to 400 per plant
Seed/Pod: 1 to 5; 2 to 3 more common
Hypocotyl Color: Green, purple
1 bushel = 60 pounds
1 hundredweight = 1.66 bushels
1 short ton = 33.33 bushels
1 metric ton = 2,204.6 pounds
1 metric ton = 36.7 bushels soybeans
1 short ton = 0.907 metric ton
1 hectare = 2.471 acres
1 acre = 0.405 hectares
34 bushel/acre soybeans = 2.29 metric tons/hectare
Protein content of seed » 36 ± 2%
Oil content of seed » 18 ± 2%
1 bushel = 11 pounds of oil
1 bushel = 48 pounds of protein-rich meal
Seed Composition
Soybeans are processed by cleaning, cracking, dehulling, and rolling them into flakes. This process ruptures the oil cells for efficient extraction to separate the oil and meal components. After removal of the oil, the reaming flakes are used to produce soybean meal. The mature soybean is about 19% oil, 34% protein, 30% carbohydrate, and 17% moisture, ash, and hull (Figure 11-1). The dehulled meal contains about 48% protein. Soybeans are the only vegetable that contain complete protein.
Figure 11-1. Soybean seed composition.
United Soybean Board
Major Uses
Soybeans are a versatile and renewable crop that help meet food, feed, and fuel demand around the world. Soybeans are approximately 20% oil and 80% meal. Most soybeans are processed for the animal feed industry but they are also used for human food products, fuel, and industrial products (Figure 11-2).
Figure 11-2. Uses of soybeans.
United Soybean Board
Grade Specifications
The United States Grain Inspection, Packers & Stockyards Administration (GIPSA) defines soybeans as grain that consists of 50% or more of whole or broken soybeans that will not pass through an 8⁄64 round-hole sieve and not more than 10% of other grains. Grading factors can be found in table 11-1.
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Grading factors |
Grades U. S. Nos. |
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1 |
2 |
3 |
4 |
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| Maximum percent limits of | ||||
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Damaged kernels: Heat (part of total) Total Foreign material Splits Soybeans of other colors1 |
0.2 2.0 1.0 10.0 1.0 |
0.5 3.0 2.0 20.0 2.0 |
1.0 5.0 3.0 30.0 5.0 |
3.0 8.0 5.0 40.0 10.0 |
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Maximum count limits of |
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Other materials: Animal filth Castor beans Crotalaria seeds Glass Stones2 Unknown foreign substance Total3 |
9 1 2 0 3 3 10 |
9 1 2 0 3 3 10 |
9 1 2 0 3 3 10 |
9 1 2 0 3 3 10 |
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U.S. Sample grade are soybeans that: (a) Do not meet the requirements for U.S. Nos. 1, 2, 3, or 4; or 1 Disregard for mixed soybeans. |
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Source: USDA, Grain Inspection, Packers & Stockyard Administration |
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Publication date: Nov. 21, 2017
AG-835
Other Publications in North Carolina Soybean Production Guide
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