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Determining the Effects of Nutrient Concentrations on Hydroponic Lettuce

CSEF · 2004 Plant Biology

Jason R. Regier · Wash (John S.) Elementary School, Fresno

Overview

Objectives/Goals My project was to determine the effects of different concentrations of fertilizer on hydroponically grown lettuce. Methods/Materials Three separate tanks were constructed of wood and lined with plastic. Each tank held the plant solution and a styrofoam panel, designed to float in the solution. Holes were drilled through the styrofoam panels to form "pockets" for each starter cup. Aerators were connected to each tank to supply oxygen. Artifical plant lights were hung overhead to substitute for sunlight. Results Tank 2 with 1/4 tablespoon of fertilizer per gallon of water had a 74% increase in total plant weight than the control tank with 1/8 tablespoon per gallon of fertilizer. Tank 3 with 3/8 tablespoon per fertilizer per gallon of water had a 14% decrease in total plant weight compared to the control tank. Conclusions/Discussion My conclusion is that more fertilizer does not always guarantee better plant growth. Additional factors need to be considered such as, pH levels, lighting, and water circulation.

Summary statement

To determine if different amounts of fertilizer would have a profound effect on the growth rate of hydroponic lettuce.

Help received

Father assisted with the construction of hydroponic tanks. Mother helped with display board and typing. Interviewed owner of Tower Garden Supplies in Fresno.

Competition history

  • CSEF 2004 Plant Biology · Entry J1622

Resources

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