KABUL, Afghanistan — Afghanistan, already torn by decades of intensifying violence, is grappling with a drought in two-thirds of the country that could lead to severe food shortages for up to two million more people, the United Nations has warned.

The United Nations humanitarian coordinator in Afghanistan said in a report released last week that a “precipitation deficit” of 70 percent in most parts of the country had affected winter harvests, and resulted in grim prospects for the spring and summer.

Many farmers have seen their seeds dry out or have delayed planting crops, and there is little or no feed for livestock on pasturelands.

The drought has led to the displacement of thousands of people this spring, adding to the nearly two million who have been forced from their homes in recent years, largely because of violence.