A machine that cuts cereal grain standing in the field.
Ridge tillage
System of planting crops on ridge tops in order to reduce farm production costs and promote greater soil conservation.
Subsistence agriculture
Agriculture by which the farmer provides food for himself and his family.
Spring wheat
Wheat planted in spring and harvested in late summer.
Pastoral nomadism
Form of subsistence agriculture that is based on the herding of domesticated animals.
Desertification
Degradation of land, especially in the semiarid regions, mainly because of human activity such as excessive crop planting, animal grazing and tree cutting.
Grain
Seed of a cereal grass.
Combine
A machine that reaps, threshes and cleans grain as it moves over the field.
Agriculture
Purposeful modification of Earth's surface through cultivation of crops and raising livestock for either consumption or economic gain.
