1. What is the Seed Rate Calculation?

The seed rate calculation determines the optimal amount of seed to sow per hectare to achieve the desired plant population, taking into account the seed size (TGW) and germination percentage.

2. How Does the Calculator Work?

The calculator uses the following equation:

Where:

• Desired Density — Target number of plants per square meter
• TGW — Thousand Grain Weight in grams
• Germination Percentage — Expected germination rate of the seed
• 10 — Conversion factor

Explanation: The equation calculates the weight of seed needed per hectare to achieve the target plant population after accounting for germination rates.

3. Importance of Seed Rate Calculation

Details: Accurate seed rate calculation ensures optimal plant population, maximizes yield potential, and prevents over- or under-sowing which can affect crop performance and profitability.

4. Using the Calculator

Tips: Enter desired plant density in plants/m², TGW in grams, and germination percentage. All values must be positive numbers (germination percentage between 0-100).

5. Frequently Asked Questions (FAQ)

Q1: Why is TGW important in seed rate calculation?
A: TGW accounts for differences in seed size - larger seeds weigh more, so fewer seeds are needed per kilogram.

Q2: How do I determine germination percentage?
A: Germination percentage is typically provided by the seed supplier or can be determined through germination tests.

Q3: What's a typical desired density for common crops?
A: This varies by crop - wheat might be 250-350 plants/m² while oilseed rape might be 30-80 plants/m².

Q4: Should I adjust for expected field losses?
A: Yes, you may need to increase the calculated rate by 5-20% depending on field conditions and establishment risks.

Q5: Does this account for seed spacing?
A: No, this calculates total seed weight needed. Spacing would be determined by your drilling equipment and method.