Wow - according to one source "The Netherlands is the world's second largest exporter of agricultural products, after the USA" [0]. Sure, it has good quality soil and high tech farming, but it's amazing that can make up for the sheer lack of space. It's smaller than all but 9 US states, and it's not rural either - it's more populous than all but 4.
That's part of it, but looks like only about €9b of €90b total [0]. Meat, dairy and vegetables are all comparable; certainly the east of the country seems to be all cows. Cereals don't crack the top ten categories, though.
[0] https://www.hollandtradeandinvest.com/key-sectors/agricultur...