it is growing organic potatoes for export to germany in wadi el natrun, 120 kilometers from cairo.tex has 88 hectares of land, which it bought from the egyptian government. it is over 40 degrees celcius, which seems rather hot for a potato crop. but the sandy desert is also a good place to grow princess potatoes. and they can be harvested at a time of the year when there aren't any new potatoes in germany. there is one drawback, however -- the fields need to be irrigated, and water is a very valuable resource in egypt. >> the soil has to be damp and wet. so that's what we do. we water the soil, we rrigate the soil, and then we start to. >> meter by meter, the water is turning the sand into fertile soil. the ground water comes from a well 150 meters deep. this is not exactly environmentally sustainable agriculture. meanwhile, back in germany, the discount supermarkets won't stock christoph schÄfer's organic potatoes in the spring because they prefer the potatoes from egypt. >> when we have a dry summer, we only need to irrigate two times to get a good potato harvest. in egypt and ot