1. What is the Seed Rate Calculator?

The Seed Rate Calculator helps farmers and agronomists determine the optimal amount of seed to sow per hectare based on target plant density, seed size (TGW), and expected establishment percentage.

2. How Does the Calculator Work?

The calculator uses the seed rate equation:

Where:

• Plants/m² — Target plant density per square meter
• TGW — Thousand Grain Weight in grams
• Establishment Percentage — Expected percentage of seeds that will establish

Explanation: The equation calculates the seed rate needed to achieve the target plant population after accounting for expected losses during establishment.

3. Importance of Seed Rate Calculation

Details: Accurate seed rate calculation is crucial for optimizing crop yields, minimizing seed waste, and ensuring proper plant spacing for optimal growth.

4. Using the Calculator

Tips: Enter target plant density in plants/m², TGW in grams, and establishment percentage. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical establishment percentage?
A: Establishment percentages vary by crop and conditions but typically range from 70-90% for cereals in good conditions.

Q2: How do I determine TGW?
A: TGW is usually provided by your seed supplier. You can also weigh 1000 seeds yourself to determine it.

Q3: What plant density should I aim for?
A: Optimal plant density varies by crop variety, soil type, and growing conditions. Consult agronomic guidelines for your specific crop.

Q4: Should I adjust for seed treatment losses?
A: Yes, if using treated seed, you may need to increase the rate slightly to account for treatment-related establishment reductions.

Q5: How does drilling method affect seed rate?
A: Different drilling methods (e.g., precision vs. broadcast) have different establishment efficiencies which should be considered.