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.
今年的种植季期间同一地块上是否种植多种作物？如果是，请指出第一作物、第二作物分别是什么。
Are several crops cultivated during this year's cropping season on the same field? If yes, please indicate which is the first and which is the second crop.
轮作：在同一块土地上连续种植不同的作物以提高土壤肥力并帮助控制昆虫的生长和疾病的蔓延。
Crop rotation: the successive planting of different crops on the same land to improve soil fertility and help control insects and diseases.
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