1. What is Wheat Seed Rate Calculation?

The wheat seed rate calculation determines the optimal amount of seed to sow per hectare based on desired plant population, seed size (TGW), and local climate conditions. Proper seed rate ensures optimal plant density for maximum yield.

2. How Does the Calculator Work?

The calculator uses the wheat seed rate equation:

Where:

• Plants per hectare — Target plant population density
• TGW — Thousand Grain Weight in grams
• Climate Factor — Adjustment for Sri Lanka's climatic zones (Dry: 1.2, Intermediate: 1.0, Wet: 0.9)

Explanation: The equation accounts for seed size and local growing conditions to determine the optimal seeding rate.

3. Importance of Seed Rate Calculation

Details: Proper seed rate is crucial for achieving optimal plant density, maximizing yield potential, and efficient resource use in wheat cultivation.

4. Using the Calculator

Tips: Enter desired plants per hectare, measure TGW from your seed lot, and select the appropriate climate zone for your location in Sri Lanka.

5. Frequently Asked Questions (FAQ)

Q1: What is typical plant population for wheat in Sri Lanka?
A: Common ranges are 150-250 plants/m² (1.5-2.5 million plants/ha), depending on variety and sowing method.

Q2: How to measure TGW?
A: Weigh 1000 randomly selected seeds from your seed lot. Typical TGW for wheat is 35-50g.

Q3: Why different factors for climate zones?
A: Dry zones need higher rates due to lower germination rates, while wet zones can use lower rates due to better establishment.

Q4: When is the best time to sow wheat in Sri Lanka?
A: Typically during Maha season (October-December) in dry zones and Yala season (April-May) in wet zones.

Q5: Should seed rate be adjusted for sowing method?
A: Yes, broadcasting typically requires 10-15% higher rates than drill sowing for equivalent plant density.