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Soil coursework

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Introduction

Stephen Hunter 10I Soil coursework AIM - To compare the vegetation cover in two areas of Meadowhead field: trampled grass and untrampled grass. Also, we conducted 5 experiments to compare the physical factors they were: Sampling Water content of soil Organic content of soil pH Soil drainage METHOD - I will get a quadrat and place it on the ground in different positions. I will then count the number of squares that have vegetation and work out the total percentage cover by dividing the number of squares by 10 and multiplying the answer by 6.25. I will then take 2 samples 1 of trampled and 1 of untrampled soils and I will do the above experiments on each sample. I will drop the quadrats 10 times on trampled and 10 times on untrampled areas this will make the results more accurate because if I drop it once the place I drop it at may have a problem or be measured wrong. I will drop the quadrat randomly by throwing it this will make it a fair test rather than dropping the quadrats deliberately in an area with lots of vegetation. ...read more.

Middle

So if there is a lot of rain, untrampled soil will be able to drain the excess water more efficiently. Where as trampled soil will become waterlogged because the air particles in the soil fill up with water. The particles in the trampled soil will be more tightly Stephen Hunter 10I PREDICTION- packed together because pressure that has made them trampled has squashed the particles together. If the drainage is poor as it is in trampled soil then nutrients cannot get to the plants. This is another reason why I think that untrampled soil will have more vegetation. RESULTS- PERCENTAGE COVER QUADRAT NUMBER NO OF SQUARES WITH OVER 70% COVER TRAMPLED UNTRAMPLED 1 5 16 2 4 16 3 10 16 4 7 16 5 5 16 6 2 16 7 2 16 8 7 16 9 3 15 10 12 15 TOTAL 57 158 The average percentage cover for trampled is 57 / 10 x 6.25 = 35.625% = 36% (to nearest whole %) The average percentage cover for untrampled is 158 / 10 x 6.25= 98.75% =99% (to nearest whole %) Notice the percentage cover for untrampled is nearly 3 times percentage cover for trampled. ...read more.

Conclusion

I feel that I could have done with doing each experiment twice which I intended to do but there wasn't enough time. I think that because I rushed the experiments some of them were inaccurate however some were fine and proved the point. I think the method was fine I don't feel that any alterations of it were needed. These results are in general not very accurate, two out of the five are definitely not right the others I think are ok but again could be wrong. The organic content test was definitely wrong this could be because of inaccurate timing due to doing two experiments at once. The results for the water drainage test I think were incorrect I'm not sure what the problem was maybe the water wasn't passed through at the same time. If there was more time I think it would have been good to take two or three samples of each trampled and untrampled areas and do the tests on all samples this may have erased some of the mistakes in the final results. Overall I don't think the experiments and the whole investigation was very successful although some of the results were useful and correct. I think the problem areas have been identified and given another opportunity the experiments would be done better. ...read more.

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