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The Effect of Fertilizer on Plant Height

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by

Fritz Robinett

on 18 June 2010

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Transcript of The Effect of Fertilizer on Plant Height

The Effect of Fertilizer on Plant Height Observing While visiting my Mom and Dad one day, I noticed that my Mom's plants are always vibrant and healthy whereas my plants always have yellow leaves and seem less healthy. I was sick and tired of buying plants only to have them wither and die a few weeks later. There were a whole host of things that could have negatively effected my plants like amount of sun, amount of water, soil composition, etc. Defining the Problem Forming the Question Because measuring "plant health" seemed a bit difficult to measure accurately, I altered my original question and posed the following:
"DOES FERTILIZER EFFECT THE HEIGHT A PLANT WILL GROW?" After talking with my mom, I realized that my sunlight, water and soil was very similar to hers, but she was giving her plants a fertilizer. If fertilizer is added to plants, then the fertilized plants will grow taller than the unfertilized plants because my moms plants have grown better with fertilizer. Carrying Out the Study To test my hypothesis, I selected 20 bean plants from the local Home Depot. All 20 plants appeared to be in good health and were about the same height.

On day 1, each plant was measured and their initial height was recorded. For 12 days each plant was given equal amounts of sunlight and water.
The control group of plants (GROUP 1) was not given any fertilizer.
In the experimental group of plants (GROUP 2) the recommended amount of fertilizer was added to the water each day according to the directions on the box.
For this experiment "Grow Fast" fertilizer was being tested. THE RESULTS The control group of plants (GROUP 1) grew an average of 7.2 cm during the experiment
The experimental group of plants (GROUP 2) grew an average of 7.9 cm during the experiment
One plant in GROUP 1 lost some leaves and appeared to be dying
Two plants in GROUP 2 had leaves turn yellow and fall off Reflecting on the Findings The reason the experimental group of plants grew taller MAY BE because of the "grow fast" fertilizer that was added.
These results show that fertilizer may have had an effect on the rate of plant growth because the experimental plants grew 0.7cm taller on average.
Although the experimental group of plants did grow taller than the control group, the amount of extra growth does not seem to be significant.

CONCLUSION In this experiment, a fertilizer's effect on the vertical growth of plants was tested. The experimenter hypothesized that fertilizer would make the plants grow taller. The results show that, on average, plants with fertilizer grew 0.7 cm taller over the course of 12 days. This small amount of height increase could be attributed to the fertilizer or may be caused by natural differences in the plants. Increasing the sample size would be one way to improve this experiment and minimize the bias caused by any one plant. Another improvement to this experiment might be using a greenhouse to better control the conditions. QUESTIONS FOR FURTHER RESEARCH Does the type of fertilizer effect plant growth?
Does the color of light effect plant growth?
Which factor is more important to plant growth, sunlight or water?
How much fertilizer is too much?
How does air temperature effect plant growth?
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