Agricultural Ideas for Science Fair Projects (page 2)
Agriculture doesn't have its own category in science fairs, but it is a part of many of the "official" categories. 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.
How do different conditions affect the speed at which fruit and vegetables ripen?
Temperature, light, placement in sealed bags, exposure to other ripe fruit--all have different effects on different fruits. You'll need to look into ethylene gas.
How do different types of fertilizers affect plant growth?
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. Do the different fertilizers change how the plants grow? You could measure height, width, number of leaves, how fast the plants grow, number of flowers or yield.
What happens when you grow sweet potatoes next to other plants?
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.
How do different treatments change how fast seeds sprout?
You can find out how quickly seeds sprout under different temperatures, or after being soaked for different times or in different liquids. Or, see how one kind of treatment affects different types of seeds.
How close does a pesticide have to be to protect a plant?
Grow a number of groups of the same plant. Apply a Bt-based insecticide directly to the plant according to the directions on the package and at various distances from the plants. Compare the amount of insect damage to each group of plants. You might also look at how big or fast each group of plants grows.
What effect does seed size have on how well a crop like oats or wheat grows?
You can define success a number of ways: how many seeds sprout, how fast the plants grow, how tall the plants get.
Which way is up?
Many seeds and bulbs have a definite top and bottom. What happens if you plant them upside down or sideways? Will the seeds still grow; will it take longer for leaves to start showing up?
What happens if you change a seed’s direction once it starts to sprout? Many seeds like beans can be sprouted in moist cotton or paper towels. What happens if you turn the seed 90 or 180 degrees from right side up every few days after it sprouts?
You can take it a step further by using a record player turntable to simulate changing gravity’s pull on seeds. You’ll want to know more about the chemical auxin, which affects where roots and stems grow.
Roots on Restriction (Would that be grounded?)
Does the amount of room a plant has for roots make a difference in how big a plant will grow, regardless of how much fertilizer the plant is given? Plant seeds in a variety of different-sized containers using vermiculite or other soil-less material, so you will be able to give each plant a measured amount of fertilizer. Or plant a number of plants in the same size containers and vary the amount of fertilizer and see what happens. Be sure to use small enough containers so that root growth really will be constricted.
Medicine and Health (Nutrition)...
Are all apples equally sweet? As apples ripen, the starch in the fruit changes to sugar, making the fruit sweet. What kind of sweet differences are there between apple varieties or individual apples of the same type?
Starch levels in apples can be measured by dipping a portion of the apple into an iodine solution. The starch reacts with the iodine solution to produce a blue-black color in a pattern that is characteristic for each variety of apple. For example, Red Delicious apples lose starch in a fairly even ring, while Golden Delicious apples have an uneven pattern.
It is best to test fresh apples that have not been stored, so this experiment is best done in the fall. Another way to use this test is to track apple ripening from a single tree over the harvest season to pinpoint the best time to harvest that tree’s apples.
Is there chemical contamination in your streams and creeks? One way to test for such contamination is with a bioassay.
Of all the possible water-quality bioassay organisms, lettuce might be one of the last you would think of. Lettuce doesn't live in water, so why use it to test water quality? The reason is lettuce bioassays are inexpensive, easy to do, and the seeds are pretty sensitive to some types of contaminants in water, including heavy metals, pesticides and other organic toxins. Although any variety of lettuce may do, Lactuca sativa Buttercrunch is the standard variety recommended for bioassays by the U.S. Environmental Protection Agency, the Food and Drug Administration, and the Organization for Economic Cooperation and Development.
You might try taking a series of samples along one stream or compare streams near industry to water running though agricultural areas.
Directions for conducting experiments can be found at: Lettuce Bioassay.
How does soil pH affect the pH of water that touches the soil?
A pH meter can be found at almost any garden shop or nursery.
Gather different types of soil. Put some of each type in a cup and check out the pH. Then add water to the cups, and mix. Wait for the soil to settle and measure the pH of the water. Be sure you use water from the same source for each soil. Find out more about soil.
Does soil type change how well crops grow?
Fill boxes with different types of soils and plant the same crop in all the boxes. What happens to the plants? You could measure height, width, number of leaves, how fast the plants grow, number of flowers, or yield of seeds or fruits.
How are different soil types affected by water running over them?
Farmers in many parts of the country have to irrigate--to water their crops rather than rely only on the rain. But water running over soil can cause it to wear away, or erode. A simple experiment in soil erosion .
Medicine and Health (Nutrition)
Do different varieties of the same fruit have the same level of vitamin C?
What about different brands of orange juice? Or fresh juice compared to juice from frozen concentrate? Does the way a fruit is stored or how long it is stored change the level of vitamin C? Here's how to test for vitamin C content.
Are there different amounts of iron in different breakfast cereals?
The iron in ready-to-eat breakfast cereals is in the form called elemental, not in combination with any other chemical compound. Iron is sprayed on the outside of cereal flakes. You can separate the iron with a strong magnet.
Reprinted with the permission of the U.S. Department of Agriculture.