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洋芋在低山区连续就地冬播留种,退化严重,所以高山洋芋下低山,有“头年收入多,二年走下坡,三年一亩没几箩”的说法。如我们1973年从高山引来的米拉种薯,连续就地冬播留种,第一年亩产5,295斤;第二年亩产陡降至1,765斤;第三年亩产仅1,440斤,相当于头年的27.2％。因此,低山区每年不得不花大量人力物力到高山调运种薯。这样做,种薯数量不可靠,所需品种和种薯质量也很难保证,使生产处于严重被动的局面。
Potato in the low mountainous areas continue to sow in winter seeding, degenerative serious, so alpine low mountains, “first-year income and more, two years to go downhill, three acre few”. For example, the mirage potato introduced from the mountain in 1973 continued to be sowed in winter for 5 months in a row, yielding 5,295 kg per mu in the first year; a steep drop to 1,765 kg in the second year; 1,440 kg per mu in the third year, Equivalent to 27.2% of the first year. As a result, low mountainous areas have to spend a great deal of manpower and material resources on the mountain to transport and transplant seed potatoes every year. In doing so, the number of seed potatoes is unreliable, the quality of the varieties and seed potatoes required are also hard to guarantee, and the production is in a serious passive situation.