Expert systems can be effective tools for knowledge sharing in agriculture. They allow researchers and experts to document agricultural knowledge that can then be accessed by extension workers and farmers through applications like decision support systems. Expert systems integrate information from different sources and experts to provide recommendations for tasks like variety selection, farming practices, pest diagnosis and treatment. They can also be used as community knowledge bases where individual experts build systems in their areas of specialization. Overall, expert systems help address gaps in agricultural expertise and knowledge sharing.