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By Brian Shmaefsky

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The availability of water was a major problem for early agriculture. Irrigation provided some protection against the unpredictability of the weather that brought rain during the growing seasons. It permitted people to divert floodwater away from crops and allowed them to get water to plants when rain was not available. Some of the water was also taken for domesticated animals to drink. 2 The Biological Energy Sources Era of agriculture relied on the work of humans and animals to do the farming.

The technique is also used for ornamental plants such as roses. Biotechnology in Crop Production number of new crop varieties. Scientists were hampered by the limitations of selective breeding until the development of recombinant DNA technology in 1972. Recombinant DNA technology gave the hope of being able to rapidly develop highly desirable crops. Using recombinant DNA technology scientists are able to insert DNA with desirable traits into the cells of another organism. As a result the organism is able to take on the new traits and pass them along to its offspring.

Irrigation provided some protection against the unpredictability of the weather that brought rain during the growing seasons. It permitted people to divert floodwater away from crops and allowed them to get water to plants when rain was not available. Some of the water was also taken for domesticated animals to drink. 2 The Biological Energy Sources Era of agriculture relied on the work of humans and animals to do the farming. This era began by using human power and ended with using animals to drive plows and light machinery, as shown in the top photograph.

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