The problem was to test which nutrient was the most essential for the
plant in order for it to grow in a controled enviroment


Which nutrients are essential to make a plant grow in a controled enviroment?  


Nitrogen, a major nutrient, is most essential for a plant's growth. If
it is lacking, then the leaves will turn grayish, become shorter, and
the plant could possibly die.


3Tomato Plants
3 Pots
3 Liters water
1500 mg of Ammonium Nitrate
1500 mg of Potassium Chloride
1500 mg of Phosphate
Container of "Complete Fertilizer"



After the plants were potted in controlled environments they were then
all left outside and exposed to a changing variety of weather
conditions, including sun, shade and extreme cold. Although all plants
received a daily dosage of liquid nutrients, they began to die
rapidly, with leaves turning brown and stalks drooping.


The problem was to see which of the thirteen nutrients was the most
important for plant growth and what would happen when those nutrients
were lacking. The hypothesis was that Ammonium
Nitrate was the most important and that without it the plants could
possibly die. The experiment was conducted using the following
procedure. Tomato plants were given all of the nutrients, except that
each of tomatoes would be lacking 1 of the three major nutrients.
potassium, phosphorus, or nitrogen. The same
amount of each nutrient was given to each plant and all of the plants
received the same amount of light and heat. Unfortunately, the
hypothesis that Ammonium Nitrate was the most important nutrient was
proved false from the data collected. After two weeks of growth, the
plants that did the worst were the ones given the complete fertilizer.
The plants that were given no nutrients grew the tallest and best. But in
general, almost all of the plants decreased in size.
However, there could have been many sources of error that could have
altered the results. First of all, there was very little sunlight
because it winter. Light was found to be the most important
factor, so having very little light could have stoped even the plants
containing all the nutrients. Second, watering could have been a
problem. There was no way to detect if the watering was sufficient or
deficient, so the watering could have done them in. Third, the
measurements might not have been exact. The plants given the complete
fertilizer could have died because the solution given to them was too
concentrated and could have caused the plants' roots to have been
burned. This might have happened to the other plants to.