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Investigation to find out if Variation of Water/Fertiliser Ratio Has Any Effect on the Growth of Grass Seeds

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Introduction

Investigation to find out if Variation of Water/Fertiliser Ratio Has Any Effect on the Growth of Grass Seeds In this investigation I will grow grass from seeds. I will use eight seeds in each container and grow them in compost. I will use liquid fertiliser and prepare it by pouring the needed amount into a measuring cylinder. I will use the same amount of liquid given to the seeds, but the strength of the fertiliser will be changed. I will do this to make it a fair test. During the experiment I will measure the plant growth during the experiment. I will take readings four times a week, then work out the mean, so there will be five results. I will measure the shoot growth with a 30cm ruler, and then change to a 1m ruler if the shoots exceed 30cm.The measurements will be accurate to 1mm. I will keep my plants on a windowsill in room temperature - 20 degrees. ...read more.

Middle

If the plants get too many minerals, above the recommended amount, then the plants may get harmed and as a result of osmosis water may pass out of their roots. The seeds with less fertiliser will grow more than the seeds with just water as, even though they wont get the required amount of minerals, they will get more than the seeds with just water, therefore, growing bigger. My Method for this experiment was: I collected my equipment together; making sure everything was equal. I punctured holes in the bottom of each container, for drainage, then filled the containers with equal amounts of compost. I put eight seeds on an equal level under the compost, then watered the seeds with just water firstly, as the fertiliser was too strong for just seeds and could only be used on shoots. I then labelled each container with the dosage of fertiliser, or water I would use on the shoot. When the seeds developed into shoots I began to use fertiliser. ...read more.

Conclusion

Each of my graphs has an upward growth curve, which means none of the plants stopped growing. My results coincide with my predictions, even though the half-strength fertiliser was much more effective than I thought it would be. The effect the double strength fertiliser had on the plant was that is stunted it growth, compared to the other plants. This was in accord to the instructions on the fertiliser, and how much was needed for the plant. Too much fertiliser, the instructions claimed would damage the plant, which it obviously did, as the plant with double-strength fertiliser grew the least. As with my experiment there were many limitations, such as missed lessons and an inability to control the exact amount of light and heat that got to the plants. I could improve this experiment by controlling the exact amount of light and heat getting to the plant, and I could make sure I ran the experiment with all the necessary time needed. These things would make my experiment fair, and therefore a better experiment, with more information being taken. ...read more.

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