Farming and farm machinery have continued to evolve. The threshing machine has given way to the combine, usually a self-propelled unit that either picks up windrowed grain or cuts and threshes it in one step. The grain binder has been replaced by the swather which cuts the grain and lays it on the ground in windrows, allowing it to dry before being harvested by a combine. Plows are not used nearly as extensively as before, due in large part to the popularity of minimum tillage to reduce soil erosion and conserve moisture. The disk harrow today is more often used after harvesting to cut up the grain stubble left in the field. Although seed drills are still used, the air seeder is becoming more popular with farmers. Today's farm machinery allows farmers to cultivate many more acres of land than the machines of yesterday.
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