Ecology Calculators (Page 3)
Carbon footprint, energy use and other environmental calculations.
Crop Yield Estimate Calculator
Enter plants per hectare and yield per plant (g) to estimate yield per hectare (kg/ha and t/ha). Useful for pre-harvest yield forecasting and planting planning.
Par-Interception Calculator
Compute Incident Par, Extinction Coefficient, Leaf Area Index, Interception Pct, Intercepted Par, Transmitted Fraction from Incident Par, Extinction Coefficient, Leaf Area Index, Interception Pct. Free online Hong Kong ecology calculator.
Root-Shoot-Ratio Calculator
Compute Root Dry Weight, Shoot Dry Weight, Ratio, Total Biomass, Root Fraction Pct from Root Dry Weight, Shoot Dry Weight, Ratio, Total Biomass. Free online Hong Kong ecology calculator.
Growing Degree Days (GDD)
Enter daily max/min temperature, crop base temperature and days to compute daily mean, daily GDD and accumulated GDD over the period, for predicting crop phenology and growth stages.
Nutrient-Use-Efficiency Calculator
Compute Crop Yield, Nutrient Applied, Nue from Crop Yield, Nutrient Applied, Nue. Free online Hong Kong ecology calculator.
Crop-Growth-Rate Calculator
Compute Initial Weight, Final Weight, Ground Area, Days, Cgr, Biomass Gain from Initial Weight, Final Weight, Ground Area, Days. Free online Hong Kong ecology calculator.
Crop Water Footprint
Enter total water use and crop yield to compute the crop water footprint = water use (m³) ÷ yield (t), with the equivalent L/kg, assessing water-resource efficiency of production.
C/N Ratio Calculator
Enter carbon and nitrogen contents (same unit) to compute the carbon-to-nitrogen ratio C/N = carbon ÷ nitrogen, used for compost mix, organic-matter decomposition rate, and soil nitrogen immobilization or release.
Thousand-Grain-Weight Calculator
Compute Sample Weight, Seed Count, Tgw from Sample Weight, Seed Count, Tgw. Free online Hong Kong ecology calculator.
Root-Length-Density Calculator
Compute Root Length, Soil Volume, Rld from Root Length, Soil Volume, Rld. Free online Hong Kong ecology calculator.
Bulk Density to Porosity Calculator
Enter soil bulk density and particle density to compute total porosity (%) = (1 − bulk density ÷ particle density) × 100, assessing soil looseness, aeration, and water retention.
Available Water Capacity Calculator
Enter field capacity, permanent wilting point, and root-zone depth to compute available water capacity AWC (%vol) = FC − PWP and the usable stored water depth (mm) for irrigation planning and soil water interpretation.