绛县郝庄公社地处丘陵区,十年九旱,复播晚秋往往没有收成。1976年该公社的大吕大队用剪蔓扦插的方法,试栽了3亩麦茬红薯,平均亩产薯块1,450斤。1978年全社推广到3,000余亩,平均亩产1,500斤左右,比复播其它粮食作物增产35%以上。麦茬扦插的红薯耐旱、高产、成本低,苗壮、叶大、缓苗快。据公社农科站调查,当气温25—30℃时,栽后24小时即开始扎根,成活率90%以上,3天后平均每天生长1.2条幼根,每条幼根每天伸长1厘米左右。栽后20天开始结 Jiang County Jiangzhuang commune is located in the hilly area, nine drought ten years, compound late autumn often no harvest. 1976, the commune’s large Lv Brigade cut cuttings method cut, planted 3 acres of wheat stubble sweet potato, the average yield of 1,450 pounds of tuber. In 1978, the whole society was promoted to more than 3,000 mu, with an average yield of 1,500 kg per mu, an increase of more than 35% over that of other sowing crops. Cuttings of wheat stubble stubborn drought, high yield, low cost, strong seedlings, leaf large, Huanmiao fast. According to the investigation of the commune agricultural station, when the temperature is 25-30 ℃, it starts to take root 24 hours after transplanting, the survival rate is above 90%. After three days, 1.2 young roots grow 1.2 times a day. Twenty days after planting start knot