永昌县东寨公社头坝大队地处沿山,海拔2100多米,无霜期120天,属二阴山旱灌区。这里多年形成的轮作制度是春小麦——夥禾(春小麦豌豆混作)——胡麻——休闲。四年一个周期。近年来,永昌县农技站在休闲地上种绿肥,将轮歇制改为粮草轮作制(春麦——伙禾——胡麻——绿肥),获得了成功。播种方式有两种。 Yongchang County, Dongzha commune head dam brigade is located along the mountains, more than 2100 meters above sea level, frost-free period of 120 days, belonging to two Yinshan dry irrigated area. The rotation system formed for many years here is spring wheat - Wo Wo (spring wheat pea mixed) - flax - leisure. A cycle of four years. In recent years, Yongchang County Agricultural Technology Station in the recreation of green manure, the rotation system into a crop rotation system (Chunma - Wo Wo - flax - green manure), and achieved success. There are two ways of sowing.