Not to talk down the Dutch achievement too much but the quality of statistics used in this article is terrible. Total monetary value of agricultural exports is a terrible way to measure output. It doesn't take into account: 1. Re-exports (Rotterdam is the largest port in Europe) 2. Specialisation in the production of certain goods (i.e. high imports and exports) 3. The high price of agricultural goods in Europe, driv…
http://statline.cbs.nl/StatWeb/publication/?PA=7100oogs
Few examples (2017 data):
Potatoes 36 900 kg/ha
Sugar beets 93 300 kg/ha
Wheat 9 100 kg/ha
Rye 3 200 kg/ha
Corn 13 500 kg/ha - 48 900 kg/ha (different kinds)
Onions 55 700 kg/ha