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The Effect of Gibberellic Acid and Fertilizer on Stem Elongation and Plant Development in the Brassica Rapa Plants growth rates can be altered using several factors Anything from temperature lighting water and nutrients can have an affect on any given plants development Green plants cannot ingest complex molecules but can utilize elements like nitrogen phosphorous potassium calcium magnesium and sulfur Nitrogen is the main requirement for plant development and can profoundly affect plant development Hershey 1990 Interestingly most household-potting soil is typically poor in nitrogen so soils may lack these components Fertilizers are composed mainly of nitrogen phosphorous and potassium These are considered the primary nutrients Fertilizers may very well contain secondary nutrients also mainly calcium magnesium and sulfur Hershey 1990 These nutrients are absorbed through the roots using photosynthesis water and carbon dioxide through a process called transpiration Hormones can also affect the growth of a plant Auxins cytokinins and gibberellins are the principle hormones that affect plant growth These hormones can either stimulate or inhibit the plants development In general auxins promote rooting directional growth as well as fruit and leaf retention Cytokinins encourage mitosis transpiration and general well being Lastly gibberellins can hasten germination create premature flowering and increase fruit pollination and growth They have also been known to modify flower sex expression aid flowers in protection from frost and inhibit root formation in cuttings Riley 1987 Wright 1993 Gibberellins were originally discovered in Japan around 1920 Investigators found the fungus Gibberella fujikoroi This fungus is often associated with a disease found in rice that makes the plants grow unusually tall and collapse Wright 1993 The discovery eventually lead to the isolation of Gibberellic acid GA-3 as well as several other gibberellins It is now known that gibberellic acid GA is found in hundreds of common plants like wild cucumbers cantaloupe beans and corn Wright 1993 Gibberellic acid can also be obtained commercially in synthetic forms In
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