1. What is the Seed Rate Calculator?

The Seed Rate Calculator helps Alberta farmers determine the optimal amount of seed to plant per hectare based on target plant population, seed size (TGW), and expected survival rate. This ensures proper plant density while minimizing seed waste.

2. How Does the Calculator Work?

The calculator uses the seed rate equation:

Where:

• \( \text{Target Plants} \) — Desired plant population per hectare
• \( \text{TGW} \) — Thousand grain weight in grams
• \( \text{Survival Percentage} \) — Expected percentage of seeds that will establish

Explanation: The equation calculates the seed weight needed to achieve the target plant population after accounting for expected seed mortality.

3. Importance of Seed Rate Calculation

Details: Proper seed rate ensures optimal plant density for maximum yield potential while avoiding overcrowding (which can increase disease risk) or underpopulation (which can reduce yield).

4. Using the Calculator

Tips: Enter target plant population in plants/ha, TGW in grams, and survival percentage (typically 80-95% for most crops). All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical survival percentage?
A: For most field crops in Alberta, 85-95% is typical, but this varies by crop, seed quality, and planting conditions.

Q2: How do I determine TGW?
A: Your seed supplier should provide this information. You can also weigh 1000 seeds yourself for accuracy.

Q3: What are common target plant populations?
A: This varies by crop. For example: wheat 200-300 plants/m², canola 50-100 plants/m² (convert to plants/ha by multiplying by 10,000).

Q4: Does this account for seed spacing?
A: No, this calculates total seed weight per area. Spacing should be considered separately based on seeding equipment.

Q5: Should I adjust for seed treatment weight?
A: TGW should be measured after treatment if the treatment adds significant weight to the seed.