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汉中市天台公社,地处秦岭深山,年无霜期200天左右。全社200多亩稻田。1970—1979年10年稻谷平均亩产仅323.6斤,最低年亩产仅一、二百斤。为尽快改变低产状况,近年来,该社先后引进常规品种10多个,因耐寒、抗病性差未推广。1979年,引进杂交粳稻黎明A×C 57试种1.1亩,当年气温正常,亩产1017斤。
Rooftop commune Hanzhong City, is located in the mountains Qinling, frost-free period of 200 days or so. The whole community 200 acres of rice fields. From 1970 to 1979, the average yield per mu of paddy in the past 10 years was only 323.6 kg, with the lowest annual yield of only one or two hundred jin. In order to change the status of low yield as soon as possible, in recent years, the agency has successively introduced more than 10 conventional varieties, which have not been widely promoted because of cold tolerance and poor disease resistance. In 1979, the introduction of hybrid rice dawn A × C 57 trial planting 1.1 acres, when the temperature was normal, 1017 kg per mu.