为了谋求解决种一茬春玉米效益较低的难题，昌黎县刘台在镇1992－1996年连续5年示范推广豌豆玉米连作栽培模式，豌豆平均单产276．7公斤，其中最高单产达448．及公斤，平均亩产值553．4元；接连玉米亩产稳保400公斤，产值520元。全年累计亩产值1073．4元，比种一茬春玉米亩产值 In order to seek to solve the problem of planting a crop with low benefit in spring maize, Changli County Liu Taiwan in the town of 1992-1996 for 5 consecutive years to demonstrate the practice of pea-corn continuous cropping patterns, peas average yield of 276.7 kilograms, of which the highest yield of 448. And kg, the average output value of 553.4 yuan per mu; successive acres of corn yield stable 400 kg, the output value of 520 yuan. The annual cumulative output value of 1073.4 yuan per mu, than a crop of spring corn mu output value