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Environmental Factors affecting plant growth

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E Rashmeen Jaggi Science Investigation - 10B 24th September 2009 An Investigation into Plant Growth Environmental Factors that Affect Plant Growth This unit we looked at different ways of improving plant growth and how do different environmental factors affect the growth of plant. The experiment was mostly to find out which factors would affect the growth of the plant and how. This report mainly focuses on how deficiency of phosphorus affects the growth of a radish plant and why. Research question How does the deficiency of phosphorus affect the plant growth as measured by number of leaves, surface area of leaves and root length? How much time will a plant take to grow or how healthy a plant will be if the plant does not obtain the required amount of phosphorus from the Sach solution? The independent variables of this experiment were complete sach solution and sach solution without phosphorus, which were measured using a measuring cylinder. The amount of complete sach solution and sach solution without phosphorus were balanced in the following ways: * 100% complete sach solution to 0% sach solution without phosphorus * 75% complete sach solution to 25% sach solution without phosphorus * 50% complete sach solution to 50% sach solution without phosphorus * 25% complete sach solution to 75% sach solution without phosphorus * 0% complete sach solution to 100% sach solution without phosphorus The dependant variables of this experiment were the number of leaves, the surface area of leaves and the root length of the plant. The number of leaves was measured by counting them and the surface area was measured by using a graph paper. All the data was collected in a table. The following were the control variables of the experiment: * The type of seed was a control variable. For every set of data, a red radish seed was used. In each tube, one seed of the plant type was planted. * The amount of light received by the plants was a control variable. ...read more.


The following observations discus the difference between the growths of plants of different treatments: * The plants growing in 0% of complete sach solution and 100% of sach solution without phosphorus developed very fast; good plant growth. The leaves were bright green and seemed very healthy and the plants themselves seemed very healthy. Also root and stem growth was very good. * The plants growing in 25% of complete sach solution and 75% of sach solution without phosphorus developed very well; amazing plant growth. The plants seemed very healthy and they had long stems and roots. The leaves were bright green and had large surface areas. * Not many seeds planted in 50% of complete sach solution and 50% of sach solution without phosphorus, germinated. Only three plants had germinated but had long stems and roots. The leaves were darker than leaves of the plants planted in 0% and 25% of complete sach solution. The leaves also contained a purple pigment. * Seeds planted in 75% of complete sach solution and 25% of sach solution without phosphorus, did not really germinate. Only two plants germinated and had relatively long stems and roots. The leaves were dark green and the stems of the plants were turning purple. Also, the tips of leaves were growing black. * Seeds planted in 100% of complete sach solution did not germinate very well either. Only two plants germinated and were very small plants. They were dying and hanging loose. The roots were very small and the stems were completely purple. The leaves were almost black in colour. Around eight out of twenty five seeds that were planted, did not germinate which is a good sing. Most of the plants were not very healthy; they had short stems and leaves and dark leaves. The plants took a while to grow which is probably due to the seed type because radish seeds take a while to germinate; they take long to grow. ...read more.


I chose to do root length because roots are normally affected by the deficiency of phosphorus. Deficiency of phosphorus might lead to short and underdeveloped roots, as mentioned earlier. Next time I could get much more steady and accurate results by labeling all the treatments differently, so that I do not get confused when mixing and poring the solutions into the tubes. Another change I would make, will be the changing the position where the experiment was kept. I would keep my experiment next to the windows because then not all of my plants will get enough sunlight which might lead to inaccurate results. Another change I would make is using different type of seeds. I would use different seeds in order to make it easier for me to different results for each day. Because most of the results for the different days are the same and I would like to avoid that so that the plant progress is clearer than before. Another change I would make is, by having more treatments. This time we had five treatments, next time I would like to have eight treatments so that we could identify the small variations in plants too. This way it will be easier for us to understand the affects of the deficiency of phosphorus better. Maybe, next time I could video my plants. This will helpful because then we don't have to take that many results and we will then be able to identify each change that the occurred in plant growth. It will also tell us that if the plant received enough light the entire time or not or if the plant was watered well not. Making a video could be very useful also to identify the stages at which the changes took place. For example, at what point the plant started to die or at which point the purple pigmentation in leaves began to appear. To conclude, I don't think that the method requires any changes and cold be redone by the changes made above. ...read more.

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