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Hay usually refers to dried grass or other pastures used as feed for livestock. When preserving hay, various methods are used to preserve its freshness and nutritional value while protecting it from moisture or pests. Wrapping hay in plastic wrap is a common way to preserve it.

Wrapping hay in plastic wrap has several benefits:

1. Moisture-proof: The plastic film can effectively prevent rainwater and moist air from directly contacting the hay, reducing the risk of the hay becoming moldy.

2. Pest-proof: Tight plastic packaging can prevent pests from entering and protect the hay from being damaged by pests.

3. Preservation: Plastic film packaging helps preserve the nutritional content and freshness of hay, especially during transportation over longer distances.

4. Easy to carry: Hay packaged with plastic film is easy to carry and store, and is also convenient for metered feeding.

However, there are a few things to note when using plastic wrap to wrap hay:

1. Make sure the hay is dry: Before baling, you must ensure that the hay is dry enough, because moist hay is prone to mold even if it is wrapped in plastic film.

2. Breathability: If possible, choose a plastic film with good breathability, or punch holes in the packaging to ensure ventilation and prevent excess moisture from accumulating inside the hay.

3. Ultraviolet protection: When exposed to the sun for a long time, the plastic film may be degraded by ultraviolet rays, affecting its protective effect.

In short, plastic film is an effective hay packaging material, which can provide moisture-proof and insect-proof protection for hay, but when using it, you need to pay attention to the dryness of the hay and the breathability of the packaging material.