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乳山县地处黄海之滨,历年无霜期平均208天,降雨量863毫米,大多集中在7—8月份。全境群山连绵,土地瘠薄,水源不足,是胶东典型的丘陵县。这里的群众很早以前就有栽种甘薯(地瓜)的习惯,在栽培技术上积累了丰富的经验。近年来在栽培技术上不断改进,逐步形成了一套新的栽培技术,获得连年丰收。1971年以前,亩产(鲜薯,下同)在2,000斤以下,1971年以后,产量逐年增长,1975年全县春夏甘薯32.4万亩,平均亩产4,629斤,1977年虽然遇到罕见的大旱,全县28.7万亩春夏甘薯平均亩产仍达到3,810斤。其中一个大队350亩春夏甘薯平均亩产达到6,625斤,并有2亩平均突破万斤大关。乳山县的丰产经验,在各地推广,也都收到良好的增产效果,现归纳为两点,介绍如下: 一、千方百计提高土壤通气性农谚:“甘薯用手能掏到,产量一定瞎不了”,说明了甘薯好气的生理特点。甘薯膨大是形成层激烈活动,
Rushan is located in the Yellow Sea coast, the average annual frost-free period of 208 days, 863 mm rainfall, mostly concentrated in the 7-8 months. Rolling hills throughout the land infertility, inadequate water supply, is a typical hilly county in Jiaodong. The people here have a long history of planting sweet potatoes (sweet potatoes) and have accumulated rich experience in cultivation techniques. In recent years, continuous improvement in cultivation techniques, and gradually formed a new set of cultivation techniques, access to successive harvest. Before 1971, the yield per mu (fresh potato, the same below) was below 2,000 jin. After 1971, the output had been increasing year by year. In 1975, the county’s spring and summer sweet potato was 324,000 mu with an average yield of 4,629 jin. In 1977, although it encountered rare Drought, the county 28.7 million mu of spring sweet potato average mu still reached 3,810 pounds. One of the brigade 350 acres of spring and summer sweet potato average yield reached 6,625 pounds, and 2 acres break the average kilogram mark. Rushan County’s high-yielding experience in all parts of the promotion, but also received a good yield-increasing effect, are summarized as two points, described as follows: First, do everything possible to improve soil ventilation Farming Proverbs: “sweet potato can dig to the hand, the output must not blind” , Shows the sweet potato physiological characteristics. Sweet potato enlargement is the formation of intense activities,