The irrigation distance of PVC agricultural water tape depends on several factors, including the following:

1. Water pressure: The irrigation distance of the hose is usually related to the pressure of the water. Higher water pressure can send water farther.

2. Water hose diameter: The diameter of the hose is also a key factor. Larger diameter hose can hold more water flow and therefore cover a wider area.

3. Pipe length: The length of the hose will affect the distance the water is transported. Generally, the longer the hose, the irrigation distance may be reduced because the water flow may lose some pressure over long distances.

4. Sprinkler type: Different types of irrigation sprinklers (such as spray heads, drip irrigation heads, etc.) have different irrigation ranges. Sprinkler type and settings also affect the distance of irrigation.

5. Soil type: Soil permeability and water-holding capacity also affect irrigation distance. Dry soil may require more water to meet plant needs, so longer hose lines or more frequent irrigation may be needed.

6. Water flow rate: The water flow rate of the hose (the amount of water flowing out per hour) is also a key factor. Higher water flow rates provide the required amount of water more quickly, extending irrigation distances.

In short, the irrigation distance of PVC agricultural water belts depends on multiple factors, and the optimal actual distance should be determined based on specific farmland conditions, water sources, and plant needs. When designing an irrigation system, these factors need to be considered to ensure effective plant irrigation.