Purpose

This essay has a total of 1374 words and 9 pages.

purpose

ABSTRACT

The purpose of this experiment was to determine whether seedlings of the same kind will
sprout faster under different controlled temperatures. The three controlled temperatures
were 32°, 20° , and 5° degrees Celsius. The hypothesis will prove that the plant in the
normal temperature range will sprout faster than the plants in the higher or lower
temperatures.


The procedure that was followed to support my hypothesis was to observe six germinating
seeds in six separate pots. Two pots each were placed in three controlled temperature
conditions. The seeds were of the same type. The same size pot was used, along with the
same soil. A big hole was punched in each pot to allow for proper drainage. A measured
amount of soil was put in the pots, and then one seed was placed in each pot and covered
with soil. Each pot was saturated with water. An equal amount of sun, and water was
provided daily over a twenty-day period. Two pots were put under a heating source to
create a temperature higher than room temperature. These pots were labeled A and B. Two
other pots were placed at the current room temperature of my house during winter months.
These pots were labeled C and D. The last set of pots were labeled E and F and were placed
in a cooler environment. The pots were observed and the data was recorded daily.


The end result of this experiment was that the two plants that were placed under a heating
source produced sprouts faster than the plants with no heating source. This proved my
hypothesis to be false. The heating source provided a better growing environment than the
normal and lower temperatures.


BACKGROUND
Most gardeners know not to plant seedlings until after the last winter frost. Some
gardeners start planting early by starting their crop inside where the temperature doesn't
reach freezing. Is the best growing environment at room temperature? Would the seedling be
affected if the temperature is a little colder or warmer. I always thought that normal
temperatures produce normal healthy plants. A normal environment seems more stable and
therefore the plant is more likely to grow quicker. If the environment is normal then the
plant does not have the added stress of adapting to it's environment. I think it would be
helpful for gardeners to know which temperature a plant grows best in. A superior seedling
will produce a superior crop. Also, there will be less chance of the seedling dying and
having to start all over again from scratch.


The first factor in creating a good growing environment is to understand that germination
does not take place unless the seed is in an environment that has adequate water and
oxygen and also sunlight. Different kinds of plant germinate at different temperatures.
Some plants require more sunlight to germinate then others. During germination, water
diffuses though the seed coats into the embryo, which has been almost completely dry
during the period of dormancy. With the absorption of oxygen by the seed, energy is made
available for growth. From the time of germination until the plant is completely
independent of food stored in the seed, the plant is known as a seedling.


The second factor is to consider the dormancy of the seed. Seed Dormancy is when a seed
has fallen from the parent plant before they are able to germinate. Many seeds require a
so-called resting period after the have fallen from there parent plant. In some plants,
chemical changes take place during the resting period that make the seed ready for
germination. Still other seeds have extremely tough seed coats that must soften or decay
before water and oxygen can enter the seed to take part in the growth of the embryo, or
before the growing embryo is capable of bursting through the seed coat.

The last factor is to understand the plant's root system. The first root of the plant,
known as the radicle, elongates during germination of the seed and forms the primary root.
Roots that branch from the primary root are called secondary roots. In many plants the
primary root is known as a taproot because it is much larger than secondary roots and
penetrates deeper into the soil. Some plants having taproots cannot be transplanted
easily, for breaking the taproot may result in the loss of most of the root system and
cause the death of the plant.

Oregano herb seeds were used for this experiment. Oregano can grow in all temperatures,
including below zero. It has a soft embryo, and germinates easily. It has a very high
tolerance as long as it is not over watered. The germination period for the seeds is 7 to
21 days.



PURPOSE

The purpose of this experiment is to find out which soil temperature (32°, 20°, or 7°
degrees C.) will allow seeds to sprout fastest.


HYOTHESIS

My Hypothesis is that the plant with the normal soil temperature will sprout faster than
the plant with the higher or lower soil temperatures.


MATERIALS
Continues for 5 more pages >>




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