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种植二季洋芋是防止退化,复壮种性,就地留种,提高产量的一项重要措施。近年来,我区发展较快,今年全区种植十三万多亩。用二季洋芋作种的大春洋芋产量,比从高寒山区——大山包换来的种薯一般增产10—30％,比本地退化的种薯可成倍增产。如昭通县永丰公社永丰五队,一九七四年二季米拉洋芋做种,种植的九十亩大春洋芋,平均亩产3504斤,比种植一般米拉洋芋52亩平均亩产2500斤增产40.1％。比种植本地河坝洋芋8
Planting two seasons potato is to prevent degradation, rejuvenation sex, in situ retention, increase production is an important measure. In recent years, our district has developed rapidly, and more than 130,000 mu have been planted throughout the region this year. The yield of spring plum grown with two-season potato is 10-30% more than that of the seed from the alpine mountainous area - the mountain, which can be multiplied more than the locally degraded seed. Such as Zhaotong County Yongfeng commune Yongfeng five teams, in the second quarter of 1974, Mira pull potato species, planted ninety acres of spring potato, the average yield of 3504 pounds, than the average yield of 52 acres of millet potato average yield 2500 Kind increase 40.1%. More than planting local river dam potato 8