Soil in oklahoma is considered the least productive.
question 4 options:
a. central
b. eastern
c. western
d. southwestern

D.  Southwestern Oklahoma

Explanation:

Soils in western Oklahoma are drier and tend to be  coarser  textured,  less  well  developed  and  contain  more  calcium,  phosphorus,  potassium  and  other  nutrients  than  do  soils  in  the  humid  eastern part of the state. Due to a higher precipitation, the southwest is the least productive soil because rains susbstracts these components.

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