Purpose :
To see the how different things help the plant grow
Description
I wanted to test whether oil, water, fertilizer, salt water, coke and Detergent helps or does not help the plant grow.
Hypothesis
I thought coke would help the plant grow the most because it has lots of sugar
I thought the oil would not help because I did an i-search on the oil spill in San Francisco. That oil spill did lots of bad things.

History of Plants
Over 3,000 million years ago, there was no oxygen on earth. Appeared the Blue-green algae which lived in the sea and can still be found in the water today. The air was made out of carbon dioxide only back then (no Oxygen).
Later after a few million years, some new plants starting breathing the Carbondioxide and released oxygen.

Discovery of PhotoSynthesis
In 1649, Jan Baptista Van Helmont did the first biological experiment in which the ingredients were measured accurately and applied on a willow tree (very similar to my experiment)
In 1772, Joseph Preistly, the British man who received the recognition of discovering oxygen, found that a piece from a mint plants could restore the air in a container with a burning candle
In 1796, Ingenhousz suggested that this process of photosynthesis causes carbon dioxide to split into carbon and oxygen. Then the oxygen is released as a gas.
In 1804 German scientist, Julius Mayer, showed that the energy of sunlight is captured in photosynthesis.
What is Photosynthesis?
Photosynthesis provides us with most of the oxygen we need in order to breathe. We, in turn, exhale the carbon dioxide needed by plants.
Photosynthesis is a process in which green plants use energy from the sun to transform water, carbon dioxide, and minerals into oxygen and organic compounds. It is one example of how people and plants are dependent on each other in sustaining life.

Procedure
I labeled the plants and kept them in separate containers.
In each plant I put the labeled thingy
E.g if it was labeled coke I put a little bit of coke in it.
I made sure I put the labeled thingy into the plant everyday, at pretty much the same time.
I did this for 2 weeks.
After 2 weeks, I left it out in the rain and sun to see what happens for another 4 weeks.

My Observation
In the first week the plant with coke and oil were doing pretty good
But at the very end -
The plant in which I poured only water did the best. It has grown the most and is doing well.
Oil did the 2nd best.
Fertilizer did OK – it will survive
The plants in which I put Coke, Detergent and Salt-water died. They have fungus on them now

Why was salt harmful?
Salt affects plant growth mainly through:
The sodium in salt is poisonous for the plant
With salt water the plants cannot drink much water, known as water stress and
They also miss out drinking some minerals particularly potassium that is needed for them.
Early signs of salt water damage
(a) darker leaves than the normal color of bluish-green,
(b) smaller leaves and
(c) stems with shorter spaces between leaf nodes.
Detergent / Oil / Fertilizer / Coke impact on plants
The impact of oil is inconclusive.
We probably put too much fertilizer and that burnt out the plant. But I think it may come back as it is still alive.
Plants don’t like coke
Detergent is released out in the environment so should not be harmful. But I am surprised that the plant died.
What would I do differently?
I would like to do this experiment in summer when there is more sunlight and then my experiment results might be different.
I would like to measure the oxygen that plants release – in specific conditions.
I would like to use different level of quantities. For example in 3 sets of plants, use 1 TBSP, 2 TBSP and 3 TBSP of Coke every day.
My Conclusions
Water is good for plants.
Coke, salt water and detergent water was quite harmful to plants
We should treat our environment with care.