More Agricultural Science Fair Project IdeasWhile agriculture is often not a formal division for science fairs, it certainly fits in many of the categories.
Botany... 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?
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. Zoology...
Surround each group of plants with a different color fabric. Be sure water can penetrate the fabrics. At set intervals, record all the insects you can find on each plants and any signs of insect damage on the plant. It is a good idea to check reference sources for common insect problems of the type of plants you are using. Medicine and Health (Nutrition)...
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. You can find reference standards for starch iodine patterns for Macintosh, Red Delicious, Empire, Spartan, and Gala apple varieties on the Internet. 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. Environmental Science...
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. You can find more science project ideas at...
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You can take it a step further by
Roots
on Restriction (Would that be grounded?) 
Can different colors and types of cloth
attract or repel insects from plants? Plant a number of groups of the same type
of plant near each other, but far enough apart to surround each set with
several feet of fabric. Or select several of the same kind of bush in one yard.
You want to use the same type of plant in the same place, so all of the plants
will have the same potential for insect damage.
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?
Is
there chemical contamination in your streams and creeks? One way to test for
such contamination is with a 
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.|
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