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An Investigation To Show The Varying Amounts Of Microbial Decay Caused By The Amounts Of Water Added to soil

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An Investigation To Show The Varying Amounts Of Microbial Decay Caused By The Amounts Of Water Added. Aim Our aim is to find the best type of soil for microbial decay. Apparatus * 15 pieces of raw cabbage 4cm2 (three in each pot), * Five plastic pots, * Five pots of different types of Soil/Compost, * Five labels, * Weighing scale, * Rulers * We will put all pots in the same place making the temperature the same for each pot (room temperature). This will make the test fair. Variable We have decided that we will have one variable this will be the variation in the amount of water we give the plant at the start of the test. We will have the following: * 1 tub of peat soil, * 1 tub of sandy soil, * 1 tub of sterilised soil, * 1 tub of soil from the environmental area, * 1 tub with no soil. It is important to keep all other possible variables constant and the same through out the whole of the experiment. So I will put all of the pots in the same place in the same tray. ...read more.


The rank of the soil types is as follows (most microbial decay first): 1. Environmental Area 2. Peat 3. Sandy 4. Sterilised 5. No Soil This shows that environmental area soil has the greatest amount of nitrogen as the more nitrogen the more microbial decay. The reason this is the case is because the nitrogen accelerates the process of microbial decay, by breaking down the matter leading to mineralisation. My prediction was also correct for the pot with the least microbial decay being the pot with no soil. This is because there are very few microbes to start off any decay other than the ones in the air. Which are very few. After a longer period of only exposure to the air the cabbage may begin to decay, but this will take very much longer than any other decay, because of the very few microbes. Evaluation I think my experiment went well, because I got some conclusive results, which are relevant to what I said in my prediction. And my results also are backed up by fact from my textbook and the Internet. But I could have improved my experiment by adding more soils into my experiment, which would have given me a better range of results. ...read more.


This is because the area is untouched by humans which has had the chance to build up layers of very fertile soil, which produces a lot of nitrogen. Nitrogen is a natural fertiliser. If combined with oxygen it will cause the plant to flourish. So I think I have proven this theory with my investigation. I could extend the work I have done already, by using a larger range of soil types and also look at where each soil type came from and look to see if there is a reflection in the amount of decay compared to where each soil type came from. This would give my investigation a larger range of results and provide additional evidence to prove the theory of the more nitrogen in the soil the more microbial decay. I could also try extending my investigation by measuring the amount of nitrogen using a soil sample, for each of the soil types and then comparing the results against each other to see if the results are relative to each other. This would give me a definite answer to see if the theory of more nitrogen equals more microbial decay is true. ...read more.

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