| name | tunnel |
| description | Use when a structure or cover extends the growing season — the family from floating row cover → low tunnel → caterpillar tunnel → high tunnel/hoophouse → greenhouse, scaled by size, that buffers frost and adds weeks at each end of the season. Season extension as built capacity; the structure that widens the climate window land×season otherwise caps. |
| atomPath | tunnel |
| coordinate | tunnel · 5/round · 6c317267 |
| contentUuid | 90d8499b-7762-53da-958f-528856cb3914 |
| diamondUuid | 01adc7e3-ca78-8d7f-b127-13f62c824769 |
| uuid | 6c317267-9442-8109-b614-8f9974d8c76e |
| horo | 5 |
| typography | {"partition":"tunnel","bondDegree":39} |
| standards | [] |
| bindings | [] |
| signatures | {"computationUuid":"ab00c28d-a8f0-8a6b-b180-861ce6f1a47c","stages":[{"stage":"path","stageUuid":"d575e056-2168-83cd-81b5-a1bbffcec1a5"},{"stage":"trinity","stageUuid":"6aa0f81a-ecd3-87ea-a322-c0cc7f667a5f"},{"stage":"boundary","stageUuid":"abdf79e1-9ab9-8421-89e0-70e7721ed728"},{"stage":"links","stageUuid":"620d7655-5fce-84a5-8ca4-59bfb5620570"},{"stage":"horo","stageUuid":"a2043407-7686-88f4-b654-63e84dedd5b5"},{"stage":"seal","stageUuid":"ea973962-bcc9-8aca-b1ee-799f20c6963d"},{"stage":"uuid","stageUuid":"421507c5-d7a0-85a1-97bc-23ae86d37d38"}]} |
| version | 2 |
tunnel — the structure that extends the season
A tunnel is a protective structure or cover that extends the growing [[season]] — the family scaled by size: floating row cover (fabric laid on a bed), low tunnel (hooped cover over one bed), caterpillar tunnel (6–8 ft, removable, low-cost), high tunnel / hoophouse (walk-in, unheated, soil-grown), and greenhouse (heated, glazed). Each adds weeks at both ends of the [[season]] — row cover/cold frame +2–6 weeks, high tunnel +8–12 — by buffering frost and raising day temperature.
A tunnel is built [[capacity]] that widens the climate window the land × [[season]] [[bottleneck]] otherwise caps: it shifts a crop's [[maturity]] earlier and its [[harvest]] later, and protects against the [[frost]] event. It is the structural complement to the biological [[hardiness]] of cool-season crops, and a real [[cost]] (materials, the structure a depreciating asset). High tunnels also house early [[propagation]].
Standards
- ATTRA/NCAT — season extension; SARE — High Tunnels and Other Season Extension Techniques
- USDA-NRCS EQIP — high tunnel system (the conservation practice); Cornell High Tunnels program
Composes [[agriculture]] · [[season]] · [[frost]] · [[hardiness]] · [[maturity]] · [[harvest]] · [[capacity]] · [[bottleneck]] · [[propagation]] · [[cost]].
