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Pour écouter ma présentation orale =} Appuyez ici

Pour écouter ma présentation orale =} Appuyez ici


Concernant la présentation orale.

La durée est un peu courte (4:00 mins au lieu de 5 mins!),

Quelques erreurs Ă  Ă©viter comme : "We haven't brainstorming" =} "We haven't done a brainstorming", the compost =} compost, the witness =} the control sample, "citrus fruits" =} citrus fruit, 3.88 three point eighty-eight =} three point eight eight (idem pour les autres chiffres) , "it's become =} "it becomes, "the compost is acid" =} acidic, "To conclude, that whether we put…."

"we come across…." =} "we came across…"… ou "we find =} found, ou "Emma's father give gave us…" car ce sont des actions au passĂ©, donc il faut utiliser le prĂ©tĂ©rit.

Attention Ă  la prononciation de certains mots comme "find", "conflicting", "point (8.09)", "neutralizes", "basic",

C'est assez bien présenté mais tu as trop insisté sur certains "détails" et ton texte est bien écrit.

Citrus fruit

Research the subject.

We did not brainstorm, since after some research on the internet, we agreed on the same subject: THE COMPOST.

Research of the problem.

Before finding our problem, we did fairly extensive research on compost. Emma's father is passionate about gardening in general, he sent us documents, which we divided and made summaries: see appendix 1 to 7. Then in our research we asked ourselves the following questions: Why do compost? And what should you put in the compost?

It must be generalizes because it reduces the weight of the household waste bin. It limits the amount of waste to be collected and transported, which pollutes enormously. Producing compost is a 100% natural and free fertilizer. Generalizing the compost will allow us to waste less to have a real awareness. In the end there are two major reasons for making compost, improving the quality of the soil and reducing pollution. In the compost, you have to put small portions of fruits and vegetables because they decompose faster, the lawn and the nettle manure can be put in also. On the other hand, you should not put plants likely to have diseases like fish and meat. Some people recommend citrus peelings and others say the opposite.
Problem: What is the impact of adding citrus to the compost?

Hypothesis 1

If citrus fruits generate more acidity than other acidic fruits (tomatoes, kiwis)., Then a compost containing citrus fruits should be more acidic than a compost containing tomatoes or kiwis.
Make a “mini compost” with a basic composition (vegetable peelings, tree leaves …) plus acidic fruits (tomatoes or kiwis). Make another "mini compost" with a basic composition (vegetable peelings, tree leaves …) plus citrus. And finally a last "mini composter" with a basic composition (vegetable peelings, tree leaves …).
Wait for the same decomposition time and then measure the pH using a pH meter

The pH of compost with kiwis is slightly more alkaline than the PH of compost with thick and thin citrus skins. So no, the hypothesis is false, citrus fruits do not acidify compost more than kiwis.

Hypothesis 2

If the thickness of the skin of a citrus fruit is thicker than the thickness of the skin of an acidic fruit (tomato or kiwi).
So the compost with the other acidic fruits (tomatoes, kiwis) must be faster (decompose faster) than a compost with larger citrus skins.
Make a "mini composter" with a basic composition (vegetable peelings, tree leaves …) and with thick citrus skins. Make a "mini compost" with a basic composition (vegetable peels, tree leaves …) and with fine citrus skins. Then make a "mini composter" with a basic composition (vegetable peelings, tree leaves …) with acid fruit skins. And finally a last "mini compost" with a basic composition (vegetable peelings, tree leaves …) only.
Compare the pH of the different "mini compost" using a pH meter.

Hypothesis is false because the mini compost made up of thick citrus skins decompose faster than the mini compost with citrus fruits with fine skins.
It is better to put citrus fruits with thick skins than citrus fruits with thin skins.

Hypothesis 3

If citrus fruits break down more slowly than all the other products put in the compost.
So a compost containing the other products will decompose faster than a compost with citrus fruits.
Make a "mini compost" with a basic composition (vegetable peels, tree leaves …) with citrus fruits. Make another "mini compost" with only a basic composition.

Compare the different decompositions at the same time.
At first, the citrus-containing compost has a lower CFU / mL concentration than the control compost (except for BEA agar), then the concentrations become greater than the concentrations of the control compost. The hypothesis that we have made is therefore false.

In general, we can therefore put citrus fruits or any other acidic fruit, since it does not change the decomposition of the compost.

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