Reduced tillage is a big one. There’s a massive misconception out there that the best thing you can do for your soil is go dig it up and turn it over. Soil is alive, and tilling disrupts microbial and fungal action that contribute to its health - by physical rupture of fungal colonies but also by exposing underground life to more sunlight and oxygen. As you kill the top several inches by physical disruption, it becomes dust much more easily washed away by wind and rain: erosion.

We do it to remove weeds before planting, and loosen soil to ease germination. Planting mixed crops or cooperative cover crops are good alternatives for weeds which are massively underused. And overall we may just need to accept some immediate productivity loss in order to ensure long term survival. Farmers are smart, but not smart enough. Too much emphasis on operating tools and fertilizers to optimize yield like land is a machine you can tune, and not enough focus on reducing the need for all this with a more subtle approach with increasing long term yield but perhaps lower yield next year. With farmers always one season away from bankruptcy, you can see why they make the wrong trade offs.

Soil depletion is at the bottom of a lot of civilization collapses in event history. The whole reason the Egyptians lasted as long as they did is that the annual Nile flooding replenished their soil with minerals brought down from higher ground by the flow of water. It wasn’t just the water itself.