Prime Minister Gabriel Attal promised more aid for French agriculture on Tuesday and vowed to shield it from “unfair competition” in an attempt to appease protesting farmers, but many appeared unmoved by his efforts as they blocked major roads around Paris for a second day.

The barricades of tractors and bales of hay caused miles of traffic bottlenecks in the Paris region, but protesters have not encircled the city. Neither have they crippled the French capital itself, which has experienced only limited disruptions so far.

Still, the farmers have become a growing thorn in the French government’s side as it struggles to respond to a wide-ranging mix of demands on farming subsidies, environmental regulations and foreign competition — to name only a few.

“Our agriculture is an asset: not only because it feeds us, in the truest sense of the word, but because it is one of the foundations of our identity and traditions,” Mr. Attal said in his first major policy speech since his appointment by President Emmanuel Macron this month.