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Much of the less spectacular desert land in the southern USA and northern Mexico has been converted to agricultural use, supported by irrigation canals that draw water from the major rivers such as the Colorado River. The crop yields can be very high because of the warm growing conditions in these regions. The high-value market crops grown in these conditions include onions, peppers, tomatoes, alfalfa, citrus crops, grapes and nuts such as pecans and walnuts. Some examples are shown in the images below. However, the ecological impacts of this are raising concerns, for at least two reasons.
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This site is no longer maintained and has been left for archival purposes
Text and links may be out of date