ToolPebAgriculture & Water tools
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Crop water need from ETo and KcETcrop = ETo × KcGross irrigation depthGross depth = net depth / (efficiency/100)Irrigation running durationDuration = volume / flowDrip irrigation total flowFlow = emitters × emitter flow / 1000Soil porosity from densitiesPorosity = (1 − bulk density / particle density) × 100Root-zone water deficitDeficit = max(0, field capacity − current) × depth × 1000Fertilizer product mass from nutrient requirementProduct mass = nutrient required / (content/100)Sprayer application rateApplication = 600 × L/min / (km/h × width)Effective field capacityCapacity = width × speed × efficiency/100 / 10Growing degree days, simple mean methodGDD = max[0, (Tmax + Tmin)/2 − Tbase]Grain mass after moisture adjustmentFinal mass = initial mass × (100 − initial moisture) / (100 − target moisture)Harvest index by dry massHI = economic yield / total biomass × 100