DG Calculator
This calculator helps you determine the Degree of Hardness (DG) of your soil. Soil hardness, also known as compaction, is a critical factor influencing plant root growth, water infiltration, and overall soil health. Understanding your soil's DG can help you implement appropriate management practices.
How to Use the DG Calculator
The DG calculator uses the principles of soil physics to estimate the hardness of your soil. Soil hardness is directly related to the pressure exerted on the soil surface and the resistance it offers.
Inputs Explained:
- Cone Penetration Area (cm²): This is the cross-sectional area of the cone used in a penetrometer. A smaller area concentrates the force, leading to a higher pressure reading for the same force. Typical values might be around 1.0 cm² for standard penetrometers.
- Force Applied (Newtons): This is the total force applied to the cone penetrometer to push it into the soil to a specific depth. This force is often measured by the instrument itself.
The Calculation:
The Degree of Hardness (DG) is calculated as the ratio of the force applied to the cone penetration area. This essentially gives you the pressure (force per unit area) exerted on the soil, which is a direct indicator of its hardness or compaction level.
Formula: DG = Force Applied (N) / Cone Penetration Area (cm²)
Interpreting the Results:
The resulting DG value (in N/cm²) provides a measure of soil compaction. Generally:
- Low DG values indicate looser, less compacted soil, which is favorable for root growth and water movement.
- High DG values suggest compacted soil, which can restrict root penetration, reduce water infiltration, and lead to poor aeration.
Specific thresholds for "hard" or "compacted" soil can vary depending on soil type and crop, but typically values exceeding 20-30 N/cm² might indicate significant compaction issues.