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).The straw residue management differs between the fields(Table 1). Farmers burn the straw and leave the ash on thefields, leave the straw untreated on the fields, or bring it backto the fields as compost. Some of the farmers in the Viet-namese regions and in PH 2 remove part of the rice strawfrom the fields. It is used as animal fodder, for cooking or asorganic fertilizer for vegetable fields.The regions are characterized by an intensive use of pes-ticides and chemical NPK fertilizers with the exception ofPH 3 where no chemical fertilizers are used and six of the teninterviewed farmers seem not to apply pesticides (Table 2).