他连续5年在同一块地上轮流种植不同作物，研究人员称之为轮作。
He grew a different crop on the same field five years in a row, what researchers call crop rotation.
同样重要的是，开展对基础知识的低端技术研究，如庄稼轮作，在小型农场中发展动植物混养。
Equally crucial is lower-tech research into basics such as crop rotation and mixed farming of animals and plants on small farms.
我们的目的是探索为什么在熟地黄轮作中种植地黄后，芝麻的收成会急剧下降。
Our objective was to explore why Sesamum indicum yield declined severely when planted after Rehmannia glutinosa in crop rotation.
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