Glossary
Payload-to-Acre (Loads per Acre)
The relationship between a drone’s hopper weight and the target application rate, which sets how many loads it takes to cover an acre — the single biggest driver of flying time and therefore per-acre cost on a granular spread.
Definition
A spreader-equipped drone carries a fixed weight of dry granular product in its hopper each trip. Divide that hopper weight by the target rate in pounds per acre and you get the acres covered per load; the inverse is loads per acre. A light rate covers many acres per load and flies fast; a heavy rate empties the hopper quickly, so the drone spends more of its time landing, refilling, and climbing back to height than actually spreading. Because that refill cycle is dead time, payload-to-acre is the lever that most directly sets flying time — and flying time is what a per-acre spreading price is built on. It is a planning number, not a spec: the honest version accounts for the real usable hopper load, the climb-and-return time to the loading point, and the rate the agronomy actually calls for.
In an Alberta Context
On an Alberta field the practical consequence is simple: a 40 lb/ac cover-crop seed pass covers far more ground per load than a 120 lb/ac urea top-dress, so the two jobs price very differently even on the same field. The distance from the loading point to the working area matters too — a field far from the staging point adds climb-and-return time to every load, which is why grouping bookings and staging product close to the field lowers the per-acre cost. UAV AG scopes each job against the actual rate and logistics rather than quoting a flat number, because payload-to-acre changes the math field by field. This applies to granular spreading of fertilizer and seed, which is the legal drone service in Canada today.
Why It Matters
Payload-to-acre is why "what does drone spreading cost per acre?" has no single answer. The rate you need and the field logistics set the loads per acre, the loads per acre set the flying time, and the flying time sets the price. Understanding it lets a grower see why a light seeding pass is cheap per acre while a heavy fertilizer rate on a far field costs more — and why lumping bookings together and staging product nearby pulls the number down. It is the honest mechanism behind the quote, not a hidden markup.
Frequently Asked Questions
+What does payload-to-acre mean in drone spreading?
It is the relationship between the drone’s usable hopper weight and the target rate in pounds per acre. Hopper weight divided by rate gives acres per load; the inverse is loads per acre. It is the number that tells you how much of the job is spent refilling versus spreading, which is the main driver of flying time and cost.
+Why does a heavier rate cost more per acre?
Because a heavier rate empties the fixed hopper faster, so it takes more loads to cover an acre. Each extra load adds landing, refill, and climb-back time — dead time that is not spreading — so the per-acre flying time and cost go up. A light rate covers many acres per load and flies fast.
+How can I lower the per-acre cost driven by payload-to-acre?
Stage the product close to the field so each refill cycle is short, group nearby bookings so mobilization is shared, and set a rate the agronomy actually needs rather than an inflated one. UAV AG scopes each job against the real rate and logistics instead of quoting a flat number.
+Does payload-to-acre apply to seeding as well as fertilizer?
Yes. Cover-crop and forage seed rates are usually light, so a seeding pass covers a lot of ground per load and prices low per acre; a heavy granular fertilizer top-dress is the opposite. Both are granular spreading — the legal drone service in Canada today — and both are priced off loads per acre.