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How are seeds cleaned and stored for use in agriculture?

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Cluster of bright red seeds emerging from the cone-shaped fruit of a magnolia grandiflora, surrounded by large, glossy green leaves. — Seed Fruit and seeds of the southern magnolia (*Magnolia grandiflora*). The fruit is an aggregate of follicles, and each follicle bears a single red seed.

In agriculture, the processes of cleaning and storing seeds are essential to ensure viability, purity, and freedom from disease.1

Seed Cleaning

Cleaning removes extraneous matter—such as stems, leaves, dirt, and weed seeds—to prepare the crop for market or storage. The methods used depend on the type of seed:2
* Dry Seed: Harvesting is typically accomplished by threshing. Specialized machinery then separates and cleans the seed based on physical properties like size, specific gravity, and surface characteristics.12
* Fleshy Fruits: Seeds are recovered either by fermenting the macerated pulp or directly through screening.1
* Grading: Beyond basic cleaning, grading machinery is used to classify seeds by specific dimensions, such as width, length, or thickness.2

Seed Storage

Proper storage is critical to maintaining seed viability from harvest until the next planting season.1
* Conditions: Seeds should be kept in environments with low humidity and cool temperatures. These conditions help prevent the exhaustion of food supplies, the breakdown of enzymes, and the accumulation of metabolic toxins that lead to a loss of viability.13
* Moisture Control: Techniques like forced-air drying or dryeration are used to reduce moisture content to safe levels, which prevents deterioration and spontaneous combustion in certain crops.2