Crop farming cost breakdown: post-harvest loss replaces scrap
Costing crop farming the way the industry actually works — input cost against actual harvest output rather than planted area, post-harvest loss as a compounding chain, and land rent as its own overhead line.
Crop farming differs from most manufacturing in one basic way: input cost (seed, fertilizer, pesticide) is bought per SEASON for the whole plot, not per unit of product - and output is only known for certain once the season ends, unlike a machined part that comes out right after one machine cycle.
The costing unit: ONE KILOGRAM (or ton) of ACTUAL HARVEST OUTPUT for that season - not planted area, since area isn't real money that went into a sellable product.
The growing sequence
- Land preparation for the season.
- Planting - seed, base fertilizer.
- Crop care - top-dressing, irrigation, pest control.
- Harvest.
- On-site processing - drying, cleaning, sorting.
- Storage pending sale.
- Transport to buyer/processor.
Two features unique to this industry
1. Farm inputs - cost against ACTUAL yield, not planted area
Seed, fertilizer, and pesticide are bought per season for the whole plot, not per unit of product. Get the cost per kilogram by dividing total input cost for the season by the ACTUAL HARVEST OUTPUT of that season - not by planted area or expected yield, since neither figure is real money that went into a sellable product.
2. Post-harvest loss - replaces scrap, and it's a compounding CHAIN
Crops lose weight at several points after leaving the field: spillage during harvest, spoilage during drying, damage during storage, crushing during transport. This is the equivalent of scrap in manufacturing, but it's a compounding chain across several points rather than a single rate at one step - the same chaining principle already used for food processing.
Cost each point separately (harvest, drying, storage, transport) and compound them, rather than estimating one blended rate from "field to warehouse" - blending hides which point is actually worth improving.
Everything else
Machinery (mostly RENTED per season or per job - tractors, combine harvesters, same principle as construction equipment rental: declare the rental rate and units used instead of purchase cost and depreciation). Labor (day-rate or piece-rate by area/output). Consumables (plow blades, harvester cutting parts). Subcontracted work (drying service, cold storage rental, drone spraying service). Rework (uncommon - mostly reprocessing off-grade produce into a lower grade rather than discarding it). Packaging (sacks, crates, pallets). Freight (field to warehouse, warehouse to buyer).
Overhead - includes land rent or the depreciated cost of agricultural land-use rights, a distinct line that varies season to season, which most industrial plants don't carry separately since they typically fold land into fixed building depreciation.
Evidence
- Field log - land prep, planting, fertilizing, spraying dates by season.
- Weigh tickets for actual harvest output, in the field and after processing.
- Land lease and equipment rental contracts/receipts.
- Loss tracking by point: harvest, drying, storage, transport.
Related guides
- Livestock cost breakdown: the feed conversion ratio drives cost
Costing livestock the way the industry actually works — feed costed by conversion ratio rather than unit price, herd loss that can't be recovered unlike scrap, and waste management as a real overhead line.
- The Ten Manufacturing Cost Categories, in Production Order
The ten cost categories Costdown uses to price a product — material, machinery, labor, tooling, scrap, rework, outsourced processing, packaging, logistics, factory overhead — with the formula and a worked example for each.
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