The study looked at how different ways of tilling the soil after harvesting crops affect the amount of leftover plant material, soil quality, weed control, and wheat yield. They found that the type of tillage used didn't really change the soil quality, but did affect how well weeds were controlled. One particular type of tillage, called one-way disking, was better at controlling weeds. The researchers also discovered that the tillage method had a bigger impact on wheat yield during dry years compared to wet years.