'• With the new technology, the settlers modified their implements to meet their requirements. • In the mid-western prairie, simple ploughs were inellective as it was covered with a thick mat of grass with tough roots. • To break the sod and turn the soil over, a variety of new ploughs were devised. • By the early 20th century, the farmers in the Great Plains were using tractors and disk ploughs, clearing vast stretches for wheat cultivation.