Group 1 - The core viewpoint of the articles emphasizes the importance of soil testing in agricultural production and environmental protection, highlighting its role in ensuring food safety and ecological balance [1][2] - Tianyu Testing specializes in environmental monitoring, ecological resource monitoring, and soil pollution remediation services, holding one invention patent and nine utility model patents related to soil testing and remediation [1] - The company has been recognized as a key laboratory for soil quality improvement projects in Tangshan and has established itself as a technology-oriented small and medium-sized enterprise in Hebei Province [1] Group 2 - Tianyu Testing utilizes advanced soil testing technologies to provide comprehensive soil testing services for saline-alkali land in Caofeidian, supporting sustainable agricultural development in the region [1] - The company has invested in new equipment such as mass spectrometers and inductively coupled plasma emission spectrometers, which significantly reduce testing cycles and improve accuracy [2] - Tianyu Testing has implemented a four-step quality control method to ensure the reliability of test data, achieving a 100% pass rate for the provincial acceptance of the third national soil census project in 2025 [3]