Farmers can protect their rights and interests when purchasing agricultural plastic products by ensuring they buy from reputable suppliers, checking product quality certifications, and understanding the warranty terms. They should also keep receipts and any relevant documentation as proof of purchase. Engaging in collective bargaining or joining farmer cooperatives can provide additional leverage in negotiating better terms and prices. Additionally, farmers can seek legal advice if they encounter any issues with the products, such as non-compliance with quality standards or breaches of contract. By being informed and proactive, farmers can mitigate risks and safeguard their interests in the agricultural supply chain.