我省中部干旱区十八个县共种植洋芋二百多万亩,约占粮田总面积的12％,占全省洋芋总面积的50％左右。较之建国初期虽有很大发展,但单产波动很大,年与年、县与县、队与队之间产量悬殊。就全区说,单产还未超过历史最高水平。如定西地区一九七七年洋芋平均单产189斤(折主粮,下同),是近十二年单产最高一年,但还较单产最高的一九五六年低97斤。 Eighteen counties in the central arid region of our province planted more than 2 million mu of potato, accounting for about 12% of the total grain crop area, accounting for about 50% of the total area of ​​potato in the province. Compared with the early days of the founding of the PRC, although there has been a great development, the yield per unit area is very large. Years and years counties, counties and counties have poor yields. On the whole area, the yield has not exceeded the highest level in history yet. For example, the average yield of potato in 1977 in the Dingxi area was 189 kg (the same below), which was the highest yield in nearly 12 years but 97 kg lower than the highest yield in 1956.