I think you're arguing wrong.
First: there's not so much lobbying in Northern Europe countries.
Second: you should look at the size of the food and distribution industries, more than the agricultural sector
The power you get for lobbying is not directly proportional to the amount of money you spend on it; if there is less competition, lobbying will be more efficient. That's why I question the claim that the lobbying is more powerful in the USA, compared to that in the Netherlands.
"The agricultural sector in the Netherlands constitutes around 10 per cent of the Dutch economy and employs more than 660.000 people, 50.000 of which are farmers."