Ecology Calculators (Page 5)
Carbon footprint, energy use and other environmental calculations.
Chilling Hours Accumulation Calculator
Enter daily chill hours, number of days, and the cultivar's chilling requirement; the tool computes accumulated chilling = avg daily chill hours × days, and fulfillment = accumulated ÷ requirement × 100%, judging whether a deciduous tree can break dormancy normally.
Management-Allowed-Depletion Calculator
Compute Field Capacity, Wilting Point, Root Depth mm, Mad Fraction, Raw mm, Taw mm from Field Capacity, Wilting Point, Root Depth mm, Mad Fraction. Free online Hong Kong ecology calculator.
Sodium-Adsorption-Ratio Calculator
Compute Sodium, Calcium, Magnesium, Sar from Sodium, Calcium, Magnesium, Sar. Free online Hong Kong ecology calculator.
Spray-Application-Rate Calculator
Compute Nozzle Flow, Speed, Nozzle Spacing, Liters per ha from Nozzle Flow, Speed, Nozzle Spacing, Liters per ha. Free online Hong Kong ecology calculator.
Dew Point Temperature
Enter air temperature and relative humidity to compute dew-point temperature Td with the Magnus formula, for judging condensation, frost risk and leaf-wetness disease timing.
Agronomic Nitrogen Efficiency Calculator
Enter nitrogen-treated yield, zero-N control yield, and N rate to compute the Agronomic Efficiency of N: AEN = (Yn − Y0) ÷ F, i.e. how much extra yield per kg of N.
Crop-Residue-Carbon Calculator
Compute Residue Dry Mass, Carbon Fraction, Carbon from Residue Dry Mass, Carbon Fraction, Carbon. Free online Hong Kong ecology calculator.
Base Saturation Calculator
Enter exchangeable Ca, Mg, K, Na and cation exchange capacity CEC to compute base saturation BS% = (sum of bases ÷ CEC) × 100, assessing soil fertility and acidification.
Exchangeable-Sodium-Percentage Calculator
Compute Exchangeable Sodium, Cec, Esp Pct from Exchangeable Sodium, Cec, Esp Pct. Free online Hong Kong ecology calculator.
Soil-Carbon-Stock Calculator
Compute Soc Pct, Bulk Density, Depth cm, Gravel Fraction, Stock T per ha from Soc Pct, Bulk Density, Depth cm, Gravel Fraction. Free online Hong Kong ecology calculator.
Soil Loss (USLE)
Enter rainfall erosivity R, soil erodibility K, slope-length-steepness LS, cover-management C and support-practice P to compute annual soil loss A = R×K×LS×C×P (t/ha/yr).
Lime-Requirement Calculator
Compute Current pH, Target pH, Lime per Unit pH, Lime T per ha from Current pH, Target pH, Lime per Unit pH, Lime T per ha. Free online Hong Kong ecology calculator.