Deep, well-drained soils are best, but sandy areas predominate. A good source of high-qualitywater, low in salt (< 1.2 g NaCl/liter) and active carbonates, is essential. Irrigation water is usuallyprovided by wells.The main area of production is the Souss-Massa Valley near Agadir (60% to 70% of totalproduction). This area, which has 1470 hr of light between October and March (Sir Jacob, 1986),produces the highest quality and yields, but plantings are also increasing close to the northerncoastal cities of Casablanca, Rabat, and Kenitra.