The center of the North America continent from mid- Canada southwards are grasslands called parries. These areas are very flat, cold in winter, hot in summer too dry for trees. They are mow, used as the vast area for wheat and maize growing and for cattle rearing. Parries are suitable for using modern machines, fertilizer and technology. Extensive wheat farming is possible with the help of irrigation: canal irrigation or helicopter irrigation. So, wheat is produced in large amounts in Canada.