practiceInformation on agricultural practice was collected by inter-viewing farmers of the 70 LEGATO rice fields. The numberof rice crops per year range between one in the mountains(PH 3, VN 3) to three in the Mekong Delta (VN 4; Table 1).Most of the farmers in the other regions grow two rice cropsper year. A part of the farmers grow one alternative crop peryear on the fields (a variety of vegetables or water melon).The crop rotation is most widely practiced in PH 2 (6 of 10fields) and VN 2 (5 of 10 fields); in the other regions, croprotation is not practiced (VN 4) or only practiced by 1–3 ofthe 10 farmers (Table 1).