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近几年来,我县甘薯低产变中产的面积不断扩大,並出现一大批低产变中产、稳产的单位。据统计,1975—1982年乳山县春甘薯年平均栽培面积18.93万亩,平均亩产4506.6斤,其中1975、1978年两年平均亩产5072.9斤。为了逐步实现春甘薯中产栽培技术指标化,自1978年以来,重点以烟薯1号和丰收白两个有代表性的大田推广品种,分别在不同地力条件下,以大田挖根调查和试
In recent years, my county area of low-yield sweet potato continue to expand, and a large number of low-yield change in the middle class, stable production unit. According to statistics, the annual average cultivation area of Rushan spring sweet potato was 189,300 mu from 1975 to 1982, with an average yield of 4506.6 kg per mu, among which, the average mu yield was 5072.9 kg in 1975 and 1978 respectively. In order to gradually achieve mid-season sweet potato cultivation techniques index, since 1978, with emphasis on yam potato 1 and harvest two representative varieties of field promotion, respectively, under different soil conditions, field investigation and root digging root test