Prescription Map Generator Calculator

Average VR Rate and VR Total Cost hide a non-obvious property of the underlying math: neither one depends on Management Zones or Field Size at all. Each zone's rate is Base Application Rate scaled by a multiplier that steps evenly from Low Zone Multiplier up to High Zone Multiplier across however many zones you set, and every zone covers an equal fraction of the field. Averaging an evenly stepped sequence always lands on the midpoint of its endpoints regardless of how many steps there are, so Average VR Rate collapses to Base Application Rate times the mean of the two multipliers — exactly the same number whether you split the field into 2 zones or 10, and exactly the same whether the field is 40 acres or 4,000.

Field Size and Management Zones still matter for the per-zone breakdown shown in the chart and table (a bigger field or more zones changes how much of each zone-specific rate applies where), but the field-wide averages and totals are driven only by Base Application Rate, High Zone Multiplier, Low Zone Multiplier, and Product Cost per Unit. Flat Rate Cost and Cost Savings exist purely as a comparison baseline — they show what a single flat application rate across the whole field would have cost, so you can see whether the variable rate approach is actually saving product versus a uniform pass. None of this accounts for real soil or yield map data — it's a planning tool for rate math, not zone delineation.