The service life of PVC (polyvinyl chloride) agricultural hoses depends on several factors, including the quality of the hose, the environment in which it is used, and its maintenance. Normally, PVC agricultural hoses can have a relatively long service life, usually more than 10 years. Here are some factors that can affect the service life of PVC agricultural hoses:

1. PVC quality: Using high-quality PVC hose usually has a longer service life. Poorer quality PVC hose may be susceptible to UV rays, chemicals, and temperature changes.

2. Ultraviolet exposure: PVC hoses exposed to sunlight will gradually be damaged by ultraviolet radiation, thus shortening their service life. Using UV-stabilized PVC hose can extend its life.

3. Temperature and climate conditions: Extreme temperatures and climate conditions, such as extreme cold or heat, can cause damage to PVC hoses. Proper use and storage conditions can help extend its life.

4. Pressure and frequency of use: If the hose is used under high pressure or is bent, twisted or moved frequently, it may wear out prematurely. This wear and tear can be reduced by following the manufacturer's recommendations and proper use and maintenance.

5. Maintenance: Regular inspection and maintenance of PVC hose can extend its service life. Check for cracks, leaks, and other damage and repair problems promptly.

6. Water quality: The chemical composition of the water can also affect the durability of PVC hose. Some water qualities may cause corrosion or blockage within the hose.

Considering the above factors, if used and maintained properly, PVC agricultural water belts can usually be used for more than 10 years. However, if there are harsh environmental conditions or frequent use, its service life may be reduced. Therefore, regular inspection and maintenance are key to ensuring that PVC hoses operate effectively for a long time.