1. What is the USDA Textural Triangle?

The USDA soil texture triangle classifies soil types based on their percentages of sand, silt, and clay. The triangle is used to determine the soil texture class after measuring the relative proportions of these three components.

2. How Does the Calculator Work?

The calculator uses the USDA textural triangle classification system:

Where:

• Sand: 0.05-2.0 mm diameter particles
• Silt: 0.002-0.05 mm diameter particles
• Clay: <0.002 mm diameter particles

Explanation: The calculator determines the soil texture class by plotting the three percentages on the USDA textural triangle.

3. Importance of Soil Texture

Details: Soil texture affects water retention, drainage, nutrient availability, and root penetration. Knowing your soil texture helps with irrigation planning, fertilizer application, and crop selection.

4. Using the Calculator

Tips: Enter percentages of sand, silt, and clay that sum to exactly 100%. Values should come from laboratory particle size analysis or field estimation.

5. Frequently Asked Questions (FAQ)

Q1: How do I get my soil percentages?
A: Use laboratory particle size analysis (hydrometer or pipette method) or estimate by feel using the ribbon test.

Q2: Why must the sum be exactly 100%?
A: The triangle is based on relative proportions, so the three components must account for all soil particles.

Q3: What if my soil has organic matter?
A: This calculator is for mineral soils. For organic soils (>20% organic matter), different classification systems apply.

Q4: How accurate is this calculator?
A: Accuracy depends on the accuracy of your input percentages. Laboratory methods provide the most precise results.

Q5: Can I use this for gardening?
A: Yes, knowing your soil texture helps determine watering needs and appropriate amendments for plant growth.