France’s Emmanuel Macron was booed by angry farmers on Saturday during his first visit as president to the country’s main agricultural fair, amid rising discontent over producer prices, European Union trade talks and Chinese land purchases.

Macron was greeted by jeering farmers and activists soon after his arrival at the southern Paris showground, before stopping to talk policy with a group of hecklers.

Elected last May, France’s centrist president has promised 5 billion euros ($6.2 billion) in agricultural investment as well as minimum farm prices to prevent producers selling at a loss.

But farmers and their FNSEA lobby group remain concerned about issues ranging from trade talks with the South American Mercosur bloc to a land-buying spree by Chinese investors.