Plant Growth

Affects of soil quality on plant growth

Will plants grow better in re-used soil or new soil?

If the same soil is used to re-grow plants, then each time a new plant is grown it will not grow as well as the last.

I believe that once the plant has completed a full life cycle than the soil it had grown in will have less nutrients than it started with. Therefore I believe re-using soil after a plant has died will effect the growth of the new plant.

Results:

Trial 1 -------------------------------------Seeds out of 20------------ Life span= day planted to death

----------Average Height--------------Seeds left over---------Average Life span(Days)-----


Group A--------10.6"------------------------------------0-------------------------------------20.8

Group B--------10.4"------------------------------------0-------------------------------------21.1



Trial 2

----------------Average Height--------------Seeds left over---------Average Life span(Days)------

Group A--------10.5"------------------------------------0-------------------------------------21.6


Group B--------10.2"------------------------------------0-------------------------------------19.8



Trial 3

----------------Average Height--------------Seeds left over---------Average Life span(Days)------

Group A--------10.7"------------------------------------0-------------------------------------20.8

Group B--------9.8"------------------------------------0-------------------------------------19.1



Trial 4
----------------Average Height--------------Seeds left over---------Average Life span(Days)------

Group A--------11.1"------------------------------------0-------------------------------------21.2


Group B--------8.7"------------------------------------0-------------------------------------18.3



Trial 5

----------------Average Height--------------Seeds left over---------Average Life span(Days)------

Group A--------10.5"------------------------------------0-------------------------------------21.2


Group B--------7.3"------------------------------------1-------------------------------------17.1



Trial 6

----------------Average Height--------------Seeds left over---------Average Life span(Days)------

Group A--------10.8"------------------------------------0-------------------------------------20.4


Group B--------6.4"------------------------------------3-------------------------------------15.8



Trial 7
----------------Average Height--------------Seeds left over---------Average Life span(Days)------

Group A--------11.3"------------------------------------0-------------------------------------19.7


Group B--------5.3"------------------------------------4-------------------------------------14.6


Trial 8
----------------Average Height--------------Seeds left over---------Average Life span(Days)------

Group A--------11.3"------------------------------------0-------------------------------------20.4


Group B--------3.6"------------------------------------7-------------------------------------12.6



Trial 9
----------------Average Height--------------Seeds left over---------Average Life span(Days)------


Group A--------11.3"------------------------------------0-------------------------------------19.6


Group B--------2.8"------------------------------------8-------------------------------------10.5



Trial 10

----------------Average Height--------------Seeds left over---------Average Life span(Days)------

Group A--------11.3"------------------------------------0-------------------------------------20.5


Group B--------2.1"------------------------------------11-------------------------------------10.3

Conclusion:

Based on the results of my experiment I can conclude that my hypothesis was correct, I believe that each time a new plant grows and dies it is using up more nutrients which will decrease how healthy the next plant grown is.