This seems like an impossible requirement to meet for landlocked countries.
I didn't see how deep they go here: for example, Ireland ranked higher than I expected, because of a lot of dairy and meat production. But how much of the cattle feed is imported?
According to this article, "Ireland imports around 80 percent of its animal feed, food, beverages, and other agri-food products".
https://en.wikipedia.org/wiki/Agriculture_in_Ireland
I haven't examined the source link to see if that's fully accurate, but if it's even mostly true, and that import collapsed, it would be a catastrophe.
It's not enough just to label a country as producer/not producer for a category but rather whether that production is fully stable and internalized in case of disasters/war.
My guess is that the results in the study should look worse for many of the countries listed.
https://wits.worldbank.org/CountryProfile/en/Country/WLD/Yea...
Nature Food is one of those also ran journals that sully the brand. None of my colleagues in related fields bother with it.
The biggest export product is dairy and eggs; I get that, most of our country feels like it's pastures lmao. And eggs / chicken farms are relatively compact, not sure what they feed them though.
But second is "cocoa and cocoa preparations"... the Netherlands cannot grow cocoa itself, wrong climate, so this is all processed imported raw materials as well as re-exported cocoa beans. Third is "horticultural products", so that's all the flowers and tulip bulbs coming from the greenhouses and tulip fields, but also keep in mind a lot of that is grown in e.g. Africa and just passes through.
We're in a strategic location, sea access, rivers going deep into Europe, and we have a lot of trade connections, is the gist of it. Oh and good cows / pastures.
The country of plofkip disappearing into water and steam as you cook it, of south-american chicken re-labeled as a dutch product, and the country of absolutely tasteless, hard-as-rock tomatoes as a great export product.
A quick cycling tour through any of the greenhouse areas will quickly remind you why such an agricultural model is maybe not the greatest of ideas.. The lingering chemical smell is all telling.