Given the weight of modern-day farming equipment, some amount of soil compaction is expected. Fortunately, Mother Nature helps forgive our sins of compaction. When ice crystals form in the soil, they force some soil particles together and push others apart. As the ice melts, the flow of water carves new pathways into the soil. In certain clay soils, the wet-dry cycle also creates a similar expansion and contraction effect to reform the soil structure. By some estimates, frequent freeze-thaw and wet-dry cycles can reduce compaction by 45% to more than 70% (in the top foot of soil). When you don't have to pay for fuel, equipment or labor, this has to be the most economical way to till fields.