People have been growing crops using methods employed over many generations. However, although these methods are valuable, increasing demand for food in our countries require adaptation of improved methods. This increase in demand is due to several factors, including an increase in the human population which means less water and less land for each person; the changing global weather patterns, resulting in irregular rainfall and more frequent droughts; and an increased rate of diseases such as HIV/AIDS, malaria, and TB, which make it more difficult for people to work hard, walk long distances to fetch water, or to cultivate land.

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