To effectively maintain your agricultural plastic water pipes and ensure they last longer, follow these steps: 1) Regularly inspect the pipes for any signs of wear, cracks, or damage, and repair or replace them as needed. 2) Clean the pipes to remove any debris or buildup that could obstruct water flow. 3) Protect the pipes from direct sunlight and UV rays by using UV inhibitors or shading them. 4) Avoid exposing the pipes to extreme temperatures, as this can cause them to become brittle or expand. 5) Secure the pipes properly to prevent movement or damage from external forces. 6) Regularly check and tighten all connections to prevent leaks. 7) Implement a proper winterization process if your pipes are exposed to freezing temperatures. By following these maintenance practices, you can significantly extend the life of your agricultural plastic water pipes.