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试验证明,从北方调进的马铃薯良种当年产量较本地品种显著增产,但一经本地留种,多数品种就失去种用价值。甚至种下后,连原来下种的种薯也收不回来。寿宁县一九六○年从北方引进多子白(292—20)良种,当年产量较本地品种高的多,但不能留种。一九七八年向东北调“克新一号”“克新二号”良种50担,一九七九年又调950担,当年产量都比本地当家品种“德友一号”高一倍,一九八○年春季采用一季留种方法自留种薯春播时共栽培自留的种薯70多亩,全部发生抢窝现象,在穴中生仔薯不出土,造成生产上重大损失。
Tests showed that the output of potato varieties transferred from the north significantly increased compared with that of the native varieties, but most of the varieties lost the value of their use once they were planted locally. Even planted, even the original kind of seed under the kind of income does not come back. Shou-ning County in 1960 introduced from the north many white (292-20) varieties, when the yield is much higher than the local varieties, but can not stay species. In 1978, it transferred 50 new varieties of “Kexin No. 1” and “Kexin 2” to Northeast China and another 950 burners in 1979. The output of that year was double that of “Deyou” In the spring of 1980, a species of seedlings was planted in the spring of one year to retain 70 mu of cultivated and self-cultivated seedlings in spring. All of them were robbed of nest, and the raw earthen tubers were not unearthed in the cave, resulting in heavy losses in production.