Whenever you see the link "Add to my Outlook" on AgriFeeds, it means you can save an .ics file (compatible with the format Outlook uses) containing all the events displayed on that page or filtered according the criteria you selected.

Click on that link, save the file to your computer and then import it into Outlook.

For importing into Outlook: open Outlook, open the File menu, click on "Import and export", select "Import an iCalendar file" and browse your folders to select the file you just downloaded.

Notice that double-clicking on the file will only open and import the first event!