All Science Fair Projects

Over 1000 FREE Science Fair Project Ideas!

Topics  > Biology > Botany

Effect of fertilizer on plant growthFeatured science projectScience project video

Abstract

This experiment was conducted to find out how the amount of fertilizer used will affect the growth of plants. The experiment was done using levels of fertilizer lower and higher than the recommendation by the manufacturer.

Hypothesis

Watering the plant with  too little  or too much fertilizer will slow down  plant growth.

Scientific Terms

Nutrients, fertilizer, osmosis, molecules

Background

Fertilizers

Plants need nutrients to grow and fertilizers are a good source  of nutrients that may be lacking in the soil. However too much of anything is not a good thing.

Plants absorb water from the soil into the roots through a process called osmosis. This process will require the salt content inside the roots to be higher than the salt content of the soil. As a result, the water molecules will migrate from the soil into the roots in order to balance the salt level in the soil and in the roots.

Using too much fertilizer will increase the salt content of the soil. If the salt content of the soil becomes higher than the salt content of the roots, the water molecules will migrate out of the root into the soil causing root burn. This will cause the plant to grow more slowly, become dehydrated and eventually die.

Too little fertilizer will cause the plants not being able to grow at the optimal speed due to the lack of nutrients in the soil.

Therefore using the correct amounts of fertilizer recommended by the manufacturer is the safest way for the plants to grow healthily.
 

See our all-time most popular science projects
Search science fair projects Browse science fair projects
popular science fair projects
Complexity level:
7
Project cost ($):
25
Time required:
1 day to prepare, 10 days for observation
Material availability:
1 day to prepare, 10 days for observation
Safety concerns:

Some fertilizers react to solvents - perform the experiment in a well ventilated place and add the fertilizer slowly.