湖北省小麦、洋芋与玉米套种面积有500多万亩,占玉米面积的80％。套种增加了熟制,但也增加了地力负担;群众历来用刨山土、烧火粪的方法向山林植被索取肥料。有些地方曾利用冬季预留行和夏季玉米的大行,间种冬、夏绿肥,但因品种、栽培技术不当, Hubei Province, wheat, potato and corn intercropping area of ​​more than 500 million mu, accounting for 80% of corn area. Intercropping increased the maturity, but also increased the burden on the ground; the masses have always used shanzhai soil, burning fire manure methods to obtain fertilizer from the forest vegetation. Some places have used the winter reserve line and the summer corn line, between winter and summer green manure, but due to breed, improper cultivation techniques,