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Investigating the effects of fertilisers.

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Hannah Johnson Introduction: Fertilisers are chemicals that contain nutrients for growth. They can be solids or liquids. A solution is the most bought type of fertiliser but the pellet form is also popular. Farmers and gardeners use them because they replace lost nutrients from the soil by leading or chap removal and therefore improve the growth of the plants. There are many two different types of fertilisers. The first is natural fertilisers; the most common one is compost. The second type of fertiliser is the artificial type, this is man made and an example of this is Baby Bio. This is the type of fertiliser we will be using. Plan The investigation was conducted to find out the effects fertiliser had on the growth of plants. We will measure the plants weekly so we can compare how they have grown, for each pot there will be at least 5 measurements taken and have 15 seeds growing, in case they do not all grow and then, hopefully, we would have at least 10 seedlings to get our results from. All the seedlings that do grow will be measured then we will find the average (mean) ...read more.


Which would be 300% growth altogether, but I think that this growth would be too great and cause the plant to die and although 200% seems too much I believe that the plant would still grow because of the advertising about fertiliser and the reputation that fertiliser, generally, has of being effective. So I am going to say that my prediction for double strength fertiliser is between 200%-250% because there is a possibility that it may not affect the plants more than the full strength fertiliser. Fertiliser Strength Extra growth Growth altogether 1/4 25% 125% 1/2 50% 150% Full 100% 200% Double 150% 250% We used these apparatus: * Wheat seeds * Different strengths of fertiliser * Water * Disposable plastic cups * Ruler * Compost Safety is vital so it was important that after handling the fertiliser and compost we washed our hands and extremely important that the fertiliser did not come into contact with the eyes or mouth. Gathering Information The results were taken weekly so that we would have good results. The seedlings measured were the tallest ten in each pot. ...read more.


In an ideal situation all the seeds planted would have grown but unfortunately not all of them did. The results are reliable, in my opinion, there were ways we could have made them more so, but there wasn't enough time to conduct a very specific experiment. It would have been more accurate to take measurements more than once a week and more accurate if we had perhaps watered them twice a week instead of just one. Other ways we could have improved this experiment: * To conduct this experiment during the summer would create better results because of sunlight and warmth. * To measure, check and feed the plants more than once a week. * Testing different fertiliser may not have improved the accuracy of the results but it would have increased the range and have being easier to find out which created the greatest increase in growth. * If the experiment had been done in a natural environment for the seeds. It would have created better results to look at and have produced what would probably happen in a real life situation * If we had used more seeds we would have had larger results to compare. I find that the method we used was suitable. We could have watered them more often but that was not possible. ...read more.

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