By the end of 1990, the total area of fenced grassland had reached 183,000 hectares, while 161,000 hectares were under irrigation. Rats, pests and virulent plants have been kept under control over 1.187 million hectares of grassland.

• 到1990年底，全区草场围栏面积达18.；3万公顷，草场灌溉面积16