Which crops are grown in Mauritania where rainfall or irrigation provides enough water?

In Mauritania, agricultural production is largely determined by the availability of water through precipitation, seasonal flooding, or irrigation projects.1

Rain-fed and Seasonal Agriculture
In regions where annual precipitation exceeds 17 inches (430 mm), the principal crops are millet and dates, supplemented by sorghum, beans, yams, corn (maize), and cotton. In the Sahelian zone, seasonal agriculture is practiced on riverbanks and in wadis that are easily flooded; these areas produce millet, sorghum, beans, rice, and watermelons.1

Irrigated Agriculture
Irrigated farming is conducted at oases—where well water is accessible—and in areas supported by water-control projects, particularly along the Sénégal River valley. These irrigated lands are used to grow:1
* Corn
* Barley
* Millet
* Vegetables
* Rice (a primary focus of government efforts to increase production)1

Additionally, palm tree cultivation is a significant practice, particularly in oasis environments.12