Yield Estimate CalculatorSunflower

At a young Stage before the Kernels on the Head Can Be Counted

Once kernels on the head can be counted

1. Measure the diameter of the head
2. Measure the diameter of the disk flowers if applicable
3. Count the number of kernels per 10 cm² and divide that number by 10 to get the number of kernels per cm²

Calculate the productive area:
With the above, we can calculate the productive area as follows:
For example, let's use a diameter of 15 cm for the head and 5 cm for the disk flowers:

• Total Area: 15 x 15 x 0.79 = 177.75 cm²
• Unproductive Area: 5 x 5 x 0.79 = 19.75 cm²
• Productive Area: 177.75 - 19.75 = 158 cm²

Calculate grams per head:

Now that we have the productive area, we:

1. Multiply the number of kernels per square centimetre (cm²) by the productive area in order to get the number of kernels per head
2. Multiply the number of kernels of the head by the average weight per kernel in order to get the mass of the head. A mass of 0.04 g/kernel can be used as a guideline