Chapter 6: From Field to Storehouse on The YamBook

Section 6.1: Knowing When to Harvest

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Section 6.1: Knowing When to Harvest #

Harvesting yams is a matter of precise timing. A harvest that occurs too early results in immature tubers that do not store well, while a delayed harvest increases the risk of fiber development and underground rot.

Primary Signal: Vine Senescence #

The most reliable indicator of maturity is when the vines and leaves begin to yellow and die back. This process, known as senescence, marks the end of the growth cycle as the plant moves its remaining energy into the tuber.

Section 6.2: Getting Them Out of the Ground

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Section 6.2: Getting Them Out of the Ground #

Careful extraction is the most critical part of the harvest. Any physical damage—such as a cut or bruise—serves as an entry point for infection, which can lead to rot during storage. The longevity of the crop depends directly on how gently the tubers are handled as they are removed from the soil.

Section 6.3: Curing

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Section 6.3: Curing #

A freshly harvested yam is living tissue with an active metabolism. Curing allows the tuber to seal its own wounds before it enters long-term storage. By creating the right conditions for healing, farmers can significantly extend the storage life of their crop.

The Healing Process #

Even careful handling results in minor surface damage. Curing triggers a physiological reaction called “suberization,” where the yam forms a protective corky layer over these areas.

Section 6.4: Long-Term Storage

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Section 6.4: Long-Term Storage #

Successful long-term storage is a whole-system problem. Temperature, airflow, dormancy, pest control, and storage structure all have to support the same goal: keep the tuber alive, dry, and quiet for as long as possible.

Environmental Requirements #

Temperature is the primary control for storage life. If it is too high, the yam will sprout prematurely; if it is too low, the tissue will suffer damage and rot. The correct range keeps the tuber dormant without chilling it.

Section 6.5: Storage Facility Design

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Section 6.5: Storage Facility Design #

A successful storage facility excludes rain and pests while allowing constant air exchange. A completely sealed structure will trap heat and moisture, accelerating decay.

Essential Design Features #

Ventilation is the most critical aspect of any yam storage design. The facility must function like a lung, removing heat and CO2 while keeping the tubers dry.