| 1 | Farmers usually alternate their crops. | |
| 2 | They rotated crops in the field every year. | |
| 3 | The rotation of crops keeps the soil healthy and fertile. | |
| 4 | After several years of crop rotation, the land became infertile and needed to be supplemented with organic matter. | |
| 5 | Alternate strips planted to crops each year serve as windbreaks for the fallow strip. |
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