While calibrating his seed drill, how many seeds should Sam record per 35 ft of

Question

While calibrating his seed drill, how many seeds should Sam record per 35 ft of row length to achieve a soybean seeding rate of 110,000 seeds per acre? His row spacing is 15 inches. a. If his target stand is 110,000 plants per acre and he anticipates a stand loss of 15% (based on previous experience and current weather conditions), what seeding rate is required to get the target stand? b. Based on this revised seeding rate, how many seeds should Sam record per 35 ft. of row to get the correct stand?

Explanation / Answer

To calculate a seeding rate, use the following equation: Desired Plant Population = Seeding Rate Percent Germination x Percent Pure Seed x Percent Live Seed Emergence Growers can use this equation with any unit — acre, square yard, square foot — as long as the same unit is used in both seeding rate and desired plant population. For example, let’s say a grower wants to establish a stand of 170,000 plants per acre using a 7.5-inch row drill. The seed tag indicates that the seed has a 92 percent germination rate and is 98 percent pure live seed. Assuming a 10 percent loss in germination due to a clay soil that crusts, what seeding rate will achieve the goal stand? 170,000 plants per acre (Desired Plant Population) = 209,505 seeds per acre (Seeding Rate) 0.92 (Percent Germination) x 0.98 (Percent Pure Seed) x 0.90 (Percent Live Seed Emergence) When deciding the amount of soybean to seed, growers may need to consider other conditions on a field-to-field

• 197,000 seeds per acre in rows spaced 10 inches or less • 178,000 seeds per acre in rows spaced 11 to 20 inches • 154,000 seeds per acre in rows spaced 21 inches or more Based on its research, Purdue Extension recommends seeding rates of (assuming 90 percent germination and 90 percent emergence): • 210,025 seeds per acre for rows spaced 7 inches • 163,350 seeds per acre for rows spaced 11 to 20 inches • 130,675 seeds per acre for rows spaced 21 inches

Row Width (inches) Required Seeding Rate at 90% Germination and 90% Emergence (seeds/foot) Recommended Seeding Rate at 90% Germination and 90% Emergence (seeds/acre) Recommended Plant Population (plants/foot) Recommended Plant Population (plants/acre) 30 7.4 130,675 6.0 104,540 20 6.2 163,350 5.0 130,680 18 5.6 163,350 4.5 130,680 16 5.0 163,350 4.0 130,680 14 4.3 163,350 3.5 130,680 12 3.7 163,350 3.0 130,680 10 3.4 179,688 2.8 143,750 8 3.1 204,188 2.5 163,350 7 2.8 210,025 2.2 168,020 6 2.5 217,800 2.0 174,240

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