single cropping

例句：

1. 1. The farmers are trying to improve their single cropping efficiency.
   农民们正试图提高他们的单一作物产量效率。
2. 2.This method can help us achieve higher single cropping yields.
   这种方法可以帮助我们实现更高的单一作物产量。
3. 3. In the past, people used to plant multiple crops in one field for single cropping.
   过去，人们会在同一个田地里种植多种作物进行单一作物生产。