WEEK 5 (20/05/15)

Plants keep growing and water doesn’t decreases too much, very similar to the last week. The plants start looking for light, especially parsley, so they move to the window. No changes for the non-fertilized soil part where nothing grows.

PLANT	AVERAGE GROWN
Flowers (fertilized soil)	5, 42 cm
Lentils (fertilized soil)	13, 07 cm
Lentils (normal soil)	0 cm
Prasley (mixed soil)	5, 57 cm

Oxygen this time increased back to 0, 47% which means an increase of 3% but the quantity of CO₂ maintains at 0,01% (10022 ppm). The temperature this time stayed at 28ºC.

The fact that oxygen quantity changes but we observe no changes on the CO₂ percentage makes us think we maybe did something wrong, probably when we were calculating the oxygen, CO2 and temperature, and we had to open the tank slightly.