Van Genuchten Soil Water Retention
Computing θ_s, θ_r, α, n, m from USDA Texture Class and Bulk Density
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ET Matrix
Duty Cycle Controller
Wasatch Assay
Garden Ledger
Input Parameters
USDA Soil Texture Class
Sand
Loamy Sand
Sandy Loam
Loam
Silt Loam
Clay Loam
Clay
Bulk Density (g/cm³)
Organic Matter (%)
Compute Retention Curve
Retained Water Fractions
When θ_r exceeds plant-available thresholds, the land speaks in fractures.
