Here, we've put together a few basic ideas of agricultural science projects you can do. Use these ideas as a jumping-off place for coming up with your own project. You'll need to look into ethylene gas .
Fertilizers differ in their amounts of the nutrients nitrogen, phosphorus and potassium.
Get different fertilizers from a garden shop or nursery and apply them to groups of the same plant. You could measure height, width, number of leaves, how fast the plants grow, number of flowers or yield. Compare how fast the other plants grow at different distances from sweet potatoes. Remember to grow some control plants nowhere near the sweet potato. Check out the term allelopathy .