proper rotation of crops

例句：

1. 1. The farmer rotates the crops in the field to ensure a balanced growth cycle.
   农民在田间轮换作物，以确保生长周期的平衡。
2. 2. The seed catalog recommends proper rotation of seeds for optimal germination.
   种子目录推荐种子适当轮换以获得最佳发芽率。
3. 3. The gardener rotates the plants in the greenhouse to promote healthy growth.
   园丁在温室中轮换植物，以促进健康生长。