Exploration on motivation for local agricultural technology extension talents 并列题名：Exploration on motivation for local agricultural technology extension talents Research on construction of diversified agricultural technology extension system 并列题名：Research on construction of diversified agricultural technology extension system Research on the reform of grass-root agricultural technology extension systems Social networks and agricultural technology extension 并列题名：Research on the reform of grass-root agricultural technology extension systems the development of SCO demonstration base for agricultural technology exchange and training