Concept

Recipe: vegetable-rotation cover-crop cocktail

Also known as: cover-crop mix recipe, tri-mix recipe

Reference design composed from the ecosystem-toolkit: the canonical fall-seeded cover-crop cocktail for a temperate-zone vegetable rotation — cereal rye for biomass and weed suppression, hairy vetch or crimson clover for nitrogen fixation, and tillage radish for compaction-breaking and N-scavenging. Three plant families (grass + legume + brassica) cover three different functional niches; the mix outperforms any single species. Demonstrates the same composition pattern as the farm-tech toolkit — pick ingredients by function, combine for non-overlapping coverage.

Problem statement

A vegetable rotation has the field empty from October to April. The empty months are leaky — N leaches, soil oxidizes, weeds establish, structure degrades. A cover-crop cocktail through that window does the work the cash crop can’t do: build N supply for the next crop, hold residual N from the last crop, suppress winter weeds, increase organic matter, and (for [[no-till-farming|no-till]] systems) produce a mulch mat for spring planting.

The cocktail

Per acre, fall-seeded into prepared field, late August to mid-September:

  Cereal rye          50 lb/acre
  Hairy vetch         20 lb/acre  (inoculate)
  Tillage radish       4 lb/acre

Total seed cost ~$50/acre. Drilled or broadcast + light raking.

Why this combination:

Rye gives the dense canopy (weed suppression) and overwinter biomass (carbon, mulch).
Vetch climbs the rye for support, fixes 80–150 lb N. Without rye, vetch sprawls and is hard to terminate.
Radish punches deep, breaks compaction, scavenges sub-soil N. Winter-kills cleanly so the rye-vetch mat doesn’t have to deal with it in spring.

Termination (the critical step)

For [[no-till-farming|no-till]] spring planting:

Roller-crimp at full vetch bloom (~50% bloom, mid-to-late May depending on zone).
Plant cash crop directly into the rolled mat 1–2 weeks later.
The mulch suppresses weeds for ~6 weeks while the cash crop establishes.

For conventional tillage:

Mow at full vetch bloom.
Disc-and-till to incorporate biomass.
Wait 2–3 weeks for breakdown before direct-seeding small crops (rye allelopathy).

Variations

Option A — heavy-feeder cash crop next (corn, brassicas, cucurbits): use vetch (heavy N).

Option B — earlier spring planting needed ([[lettuce|lettuce]], [[spinach|spinach]], peas): swap vetch for crimson clover (terminates 3 weeks earlier).

Option C — heavy compaction history (former pasture, machinery-trafficked): increase radish to 8 lb/acre.

Option D — Zone 4 cold limits: drop [[crimson-clover|crimson clover]] (winter-kill risk); use rye + vetch + radish only.

Option E — pollinator priority: replace some vetch with clover (clover blooms earlier and longer); accept the lower N delivery as a trade.

Anti-pattern

Single-species rye-only winter cover. It works for biomass and weed suppression, but the field comes out N-poor and the spring crop needs more synthetic input. The legume component is what makes this a recipe rather than a chore.

Cost

Seed: ~$50/acre.
Inoculant: ~$5/acre.
Tractor time at planting and termination: ~$50/acre.
Total: ~$105/acre. Net N-equivalent value to next crop: $80–150/acre. Plus all the non-N benefits (organic matter, structure, weed suppression).

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Practical

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Ecosystem toolkit recipe / canonical fall vegetable-rotation tri-mix

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