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Moreover, it was unknown which specific chemical fertilizers would be more conducive to plant growth in Brassica rapa in particular. Another possible reason for the unexpected results is differential application of the fertilizer. For this research, the same .07 grams of fertilizer was applied to each cell. Yet it is possible that some types of fertilizer, such as liquid fertilizer, require more or less than the .07 grams. Future research would take into account the different chemical compositions of fertilizers, making sure to control for those differences. Also, future research would take into account the fact that the same amount of liquid, pellet, or powder may not yield results. The commercial instructions for each of the fertilizers should be followed. Also, it would be helpful to monitor plant growth for more than 64 hours. Future research could also include plant varieties other than Brassica rapa in case this particular species exhibits unusual behavior when exposed to fertilizers.
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After all, fertilizers are designed to promote plant growth by providing more available nutrients. This unexpected result may be due to the incompatibility between the liquid fertilizer and the Brassica rapa, because the plants in all experimental and control groups received identical treatments in terms of water and light. Different types of fertilizers, and different chemical compositions of fertilizers, are still believed to have differential effects on plant growth.
References
"Fertilizing Your Organic Garden," (n.d.). Dummies.com. Retrieved online: http://www.dummies.com/how-to/content/fertilizing-your-organic-garden.html
Relf, D., McDaniel, A. & Donohue, S. (2009). Fertilizing the vegetable garden. Virginia Cooperative Extension. Retrieved online: http://pubs.ext.vt.edu/426/426-323/426-323.html
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