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Least Significant Difference Luke Hamann Introduction Organic chemicals which are produced by the plant in small amounts act as a plant growth regulator PGRs This plant growth regulators do exactly what the name says the regulate the growth of a plant They also regulate how the plant grows Plant growth regulators are one chemicals that develop in one area of the plant This chemical stimulates growth in the other parts of the plant The thing that is interesting is that the PGRs do not need much of the chemical to work Different PGRs are used for different species of plants for example a farmer might want his crops to grow a certain way so he would use a certain PGR to manipulate its growth In this experiment we examined the difference between two PGRs and water to see what there affects would be on a pea plant We used two separate plant growth regulators the first one we used was napthalenatic acid NAA and the second was Giberellic acid GA3 The purpose of this experiment was to see how these two plant growth regulators and water affected the length of the stalk of the plant Methods and Materials This experiment necessitated three 2 week old greenhouse pea plants one of which was the control plant the control plant only received water The three plants were measured in centimeters and these measurements were recorded Then we took cotton balls and placed drops of the two PGRs and one with water Each cotton ball was secured to the base of the plants stem This act was the first step in our physical experiment and its purpose is to see which chemical or water will affect the plant most drastically The plants were fastened with red and blue ties the red ones stood for the plant that would receive GA3 the blue ties represented the chemical NAA The plant with a red and a blue tie
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