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Agriculture for Secondary Schools
3. Record all findings you have made in your portfolio.
4. Outline the lessons you have learnt from this activity.
5. Summarise your responses and present them in class.
Production of starchy root and tuber crops
Starchy root and tuber crops are crop plants that store edible starch materials in
underground stems, roots, rhizomes, corms and tubers. These crops include round
potatoes, sweet potatoes, underground and aerial yams, cassava, taro, cocoyams as
well as other edible aroids. Starchy root and tuber crops provide a large part of the
world’s food supply and are second in importance to cereals as worldwide source of
starch. These crops are also an important source of processed products for human
consumption and industrial use as well as for animal feeds especially non-ruminants.
Figures 1.83 to 1.89 show plants and roots/tubers of some starchy root and tuber
crops grown in various places of Tanzania.
Figure 1.83 (a): Round potato plants Figure 1.83 (b): Round potato tubers
Figure 1.84 (a): Sweet potato plants Figure 1.84 (b): White fleshed sweet potato
tubers
Student’s Book Form Three
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AGRICULTURE FORM 3 9.11.2022.indd 24
AGRICULTURE FORM 3 9.11.2022.indd 24 10/01/2025 12:31
