1. What is the Seeding Rate Calculation?

The seeding rate calculation determines the optimal amount of seed to sow per hectare to achieve a desired plant population, taking into account seed characteristics and field conditions.

2. How Does the Calculator Work?

The calculator uses the seeding rate equation:

Where:

• \( \text{Target Population} \) — Desired plant population (plants/m²)
• \( \text{TGW} \) — Thousand grain weight (g)
• \( \text{Germination Percentage} \) — Laboratory germination rate (%)
• \( \text{Establishment Percentage} \) — Expected field establishment rate (%)

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

3. Importance of Accurate Seeding Rates

Details: Proper seeding rates optimize crop yield potential while minimizing seed costs. Rates that are too low result in poor yields, while rates that are too high waste seed and can lead to overcrowding.

4. Using the Calculator

Tips: Enter target population in plants/m², TGW in grams, and both percentages as whole numbers (e.g., 95 for 95%). All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical target population for wheat in NSW?
A: For wheat, common target populations range from 120-180 plants/m² depending on variety and sowing time.

Q2: How do I determine TGW for my seed?
A: TGW is often provided by seed suppliers. You can also weigh 1000 seeds yourself to determine this value.

Q3: What affects establishment percentage?
A: Soil moisture, sowing depth, soil temperature, and seedbed quality all influence establishment rates.

Q4: Should I adjust for seed treatment?
A: Some seed treatments may improve germination and establishment - consult your agronomist for specific recommendations.

Q5: How does sowing method affect seeding rate?
A: Precision sowing typically requires lower rates than broadcast sowing due to more accurate placement.