1983年在伊川县开展了十万亩红薯低产变中产开发研究,经核实验收,实收面积93009亩,亩产(折粮)799斤,比前三年平均371斤增收428斤,增长115％。扣除总投资,纯收入659.68万元,比前三年平均收入净增424.11万元,增长180％。每斤成本由前三年平均0.052元下降为0.0328元,下降36.9％,承包区产量比非承包区增产50％以上。 (一)具体做法。按照红薯栽培技 In 1983, Yichuan County launched 100,000 mu of low-yielding sweet potato research and development of low-yielding mutton production. After verification and acceptance, the area received was 93,009 mu and 799 kg of mu (fold grain) per mu, an increase of 428 kg or 115% over the previous three years, . After deducting the total investment, the net income was 6.5968 million yuan, a net increase of 4.2411 million yuan over the previous three years, an increase of 180%. The cost per catty decreased from an average of 0.052 yuan in the previous three years to 0.0328 yuan, a decrease of 36.9%. The yield of contracted areas increased by more than 50% over non-contracted areas. (A) the specific approach. Follow sweet potato cultivation techniques