... international food prices, and trade at regional and global levels. Globally, 69 percent of all cereal area is rainfed, including 40 percent of rice, 66 percent of wheat, 82 percent of maize ... importance in the evolving global food system. The paper starts with a critical synthesis of the literature on the prospects for increased rainfed crop production. The review of water management, ... beneficial in areas where the runoff must travel over a long distance before reaching the cultivated area. When the slope along which the runoff must travel is very long, the velocity of the flow...