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An Investigation into How Ultraviolet

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Introduction

An Investigation into How Ultraviolet Radiation Effects the Growth of Crop Seeds Introduction The ozone layer, also known as the ozonosphere, is found in the Earth's stratosphere. Above is a diagram explaining where the ozone layer is situated in the atmosphere Over 90% of the Earths ozone can be found here. That doesn't mean to say that ozone is only found in the atmosphere. It can be easily produced by any high voltage arc here on earth for example a spark plug and a Van de Graaff generator. The ozone layer was discovered by two French physicists, Charles Farby and Henri Buisson, in 1913. But it was a British meteorologist, G.M.B Dobson who explored its properties by using a spectrophotometer. Above is a diagram of the basic working of a spectrophotometer This instrument was used to measure stratospheric ozone from the ground. Between 1928 and 1958 a worldwide network of ozone monitoring stations was established by Dobson. They still continue to operate today. It was in 1985 that British scientists at the British Antarctic Survey discovered that a hole had appeared during the southern spring in the layer above Antarctica. This was completely unexpected so scientists began to research why the hole had appeared and what it was that had caused it to appear. ...read more.

Middle

Agricultural scientists have responded to these findings with a series of ground-breaking investigations on the effect of artificial and solar UV radiation upon plant growth and development. However most of these experiments have involved the use of UV lamps which usually emit radiation quite unlike the radiation present in the normal terrestrial solar spectrum. After conducting research on the internet I came across an experiment carried out by the United States Department of Agriculture, UVB Monitoring and Researching Program. In this experiment they sampled 16 rice cultivars from several different geographical regions. Each variety of rice was grown in greenhouses which had supplemental levels of UVB radiation. Alterations in biomass, morphology and maximum photosynthesis were determined. One third of all varieties that were tested showed a statistically significant decrease in total biomass as the UVB radiation was increased. For these responsive varieties the leaf area and the tiller number were also significantly reduced. In some varieties the photosynthetic capacity, as determined by the oxygen evolution, had also declined. In this investigation I shall be exploring how crop seeds are affected by UV radiation. I am going to subject two different crop seeds, radish and broad bean, to 20 minute sessions of UV radiation once a week. ...read more.

Conclusion

rough diagram of how I expect the inside of the box to look Above is a picture showing the UVB lamp I am going to use in my experiment Hypothesis I hypothesize that after prolonged exposure to the UVB radiation both sets of crop plants will be affected in the following ways; each plant will show a decrease in growth rate, height and leaf area. However I believe that only one plant will show a decrease in yield of crop. Radish Plant I believe that due to radishes being root vegetables the yield of crop from each plant will not be affected by the UVB radiation as they are not directly exposed to the potentially harmful rays. However I think that the height and growth rate of the plant as well as the leaf area will show an overall decrease due to them growing on the top of the soil and in direct exposure of the UVB lamp. Broad Bean Plant I think that compared to the radish plants the broad bean plants will be directly affected by the UVB radiation as they are not root vegetables and produce their fruit proud of the soil. I would imagine that the yield of crop and growth rate, height and leaf area of the plant will show an overall decrease. ?? ?? ?? ?? ...read more.

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