| 1 | Cover crops can suppress weeds before they sprout, while crop rotation keeps plants one step ahead of diseases. | |
| 2 | One study examined 11 soils in the US under a rotation of maize and soybeans. | |
| 3 | Preservation of soil and crop rotation keep farmland healthy, and chemical abstinence preserves the ecosystem. | |
| 4 | Her results show that reducing emissions is more complicated than just cutting back on nitrogen fertilizers and changing crop rotation cycles. | |
| 5 | The third system is also wheat-fallow, but it uses sweep tillage and a rod-weeder to control weeds. |
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