Nations Top Barley Prod. In terms of value, wheat is the fourth leading U.S. field crop and our leading export crop.
Wheat has two distinct growing seasons.
There are several hundred varieties of wheat produced in the United States, all of which fall into one of six recognized classes. Where each class of wheat is grown depends largely upon rainfall, temperature, soil conditions and tradition. Generally speaking, wheat is more often grown in arid regions where soil quality is poor. Wheat classes are determined not only by the time of year they are planted and harvested, but also by their hardness, color and the shape of their kernels. Each class of wheat has its own similar family characteristics, especially as related to milling and baking or other food use.