轮作是应用于有机农业上的一种简单而有效的技术，能减少农药的使用和提高土壤肥力。
Crop rotation is a simple and effective technique used in organic agriculture to reduce the need for pesticides and improve soil fertility.
评估大地理区域内作物轮作水平是农业生产中必须解决的重要问题之一。
How to evaluate crop rotation level in large geographic area is one of the most important problems in agricultural production.
保护性农业是一种作物生产手段，它基于三个原则：永久性土被，最低土壤干扰，以及轮作或作物关联。
This is an approach to crop production that is based on three principles: permanent soil cover, minimum soil disturbance, and crop rotations or crop associations.
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