Contents 轮作换茬的作用 The role of crop rotation 连作 Continuous cropping 作物茬口与茬口特性 Chakou(previous crop with its stubble field) and the characteristics of chakou轮作换茬的作用 The role of crop rotation 连作 Continuous cropping 作物茬口与茬口特性 Chakou (previous crop with its stubble field) and the characteristics of Chakou Contents