Farmers choose a reliable supplier of agricultural plastic products by considering several factors. They look for suppliers with a strong reputation and positive customer reviews. The supplier's experience in the industry and the quality of their products are crucial. Farmers also consider the supplier's ability to deliver products on time and their customer service. Cost is important, but it shouldn't compromise quality. Farmers may also seek recommendations from other farmers or industry experts. Finally, they might test a few products before committing to a long-term partnership with a supplier.