Certified Crop Advisor Practice Exam

What should the adjusted seeding rate be if the pure live seed is 80% and the recommended seeding rate is 80 lbs per acre?

1. 100 lbs per acre

2. 64 lbs per acre

3. 80 lbs per acre

4. 88 lbs per acre

The correct answer is: 100 lbs per acre

To determine the adjusted seeding rate based on the purity of live seed, you can use the formula: Adjusted Seeding Rate = Recommended Seeding Rate / Pure Live Seed Percentage In this scenario, the recommended seeding rate is 80 pounds per acre, and the purity of the live seed is 80%. First, it's important to express the percentage as a decimal for calculation, so 80% becomes 0.80. Now applying the formula: Adjusted Seeding Rate = 80 lbs per acre / 0.80 Adjusted Seeding Rate = 100 lbs per acre This calculation shows that in order to achieve the desired 80 pounds of pure live seed per acre, one must adjust the seeding rate to 100 pounds per acre when using seed that is only 80% pure live seed. This ensures that the effective seeding rate delivers the correct amount of viable seeds, compensating for the reduced purity. The other options do not take into account the need to adjust the seeding rate based on the percentage of pure live seed, leading to either underestimating or overestimating the necessary amount of seed to achieve optimal planting density.