【正确答案】 As figure l shown, large and medium-scale schemes account for 65% in 1995, while pump schemes 6%. Small-scale schemes are also called private schemes. The total area of these 7,246 schemes is about 1.21 million ha. The total area for wet season irrigation was about 5003724 ha in 1995. Royal development projects cover a total area equipped for irrigation of 79,039 ha. Self-defense village projects'' total equipped area for wet season irrigation is 16,377 ha. Dry season irrigation is practised on 18 percent of the equipped area. This figure shows the different crops grown on irrigated land in the 1994 dry season. A small part of the irrigated land is used as fish ponds and vegetables during the dry season, which account for 5% and 4% respectively. The main irrigated crop is paddy during the dry season, which amount forty-three percent while 16% and 12% for sugar cane and upland crops use.