What are the purposes and common methods of agricultural extension research?

Agricultural extension is a systematic project, which spreads knowledge and information, popularizes science and technology, changes people's ideas, improves people's comprehensive quality, and ultimately improves economic and social benefits. There are not only many working objects, but also many people engaged in this cause, and there are many internal laws that need to be studied and discussed. Through the exploration of government officials, mass organizations, scholars and extension workers, the research on agricultural extension has a certain foundation. As a grass-roots agricultural extension worker, his research work focuses on the investigation of farmers' needs and behavior laws, the research of farmers' favorite extension methods, the research of extension effects and the research of farmers' decision-making consultation. The purpose is to sum up experience, explore laws, guide practice and improve the level. The commonly used research methods are interview, questionnaire, field investigation, case analysis and literature analysis.