Calculate exchangeable sodium percentage (ESP) from sodium on the cation exchange complex to diagnose sodic soils and plan gypsum amendment rates.
| Constant | Symbol | Value |
|---|---|---|
| Speed of light | c | 2.99792458×10⁸ |
| Planck's constant | h | 6.62607015×10⁻³‴ |
| Boltzmann constant | kʙ | 1.380649×10⁻²³ |
| Avogadro's number | Nₐ | 6.02214076×10²³ |
| Gravitational constant | G | 6.6743×10⁻¹¹ |
| Gas constant | R | 8.31446 |
| Elementary charge | e | 1.602176634×10⁻¹⁹ |
| Electron mass | mₑ | 9.1093837015×10⁻³¹ |
| Proton mass | mₚ | 1.67262192369×10⁻²⁷ |
| Fine-structure constant | α | 7.2973525693×10⁻³ |
Calculate exchangeable sodium percentage (ESP) from sodium on the cation exchange complex to diagnose sodic soils and plan gypsum amendment rates
Each component has a specific meaning:
Note: Interpret the esp calculator result against the clinical thresholds and context described above.
Enter the sodium on the cation exchange complex for the patient or scenario you are assessing. Calculate exchangeable sodium percentage (ESP) from sodium on the cation exchange complex to diagnose sodic soils and plan gypsum amendment rates. Use the esp calculator result to inform your clinical assessment.