Technical data

Effect of the soil temperature on the germination and growth of higher plants

Article no: P4060100

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Principle

Genetically determined growth processes in plants are primarily triggered or inhibited by special phytohormones. However, external factors such as light, temperature, water, oxygen and air humidity play a decisive role in these processes. With
regard to temperature, there are ranges within which this environmental factor reaches the most favourable value for germination and growth of a plant (preferential or optimum range, preferendum). The effect of different temperatures on the growth of cress (pepper grass, Lepidium sativum) is analysed in this experiment.

Benefits

Precise measurement possible with 12 different temperatures
Allows to set up a wide temperature range
The ring-shaped measurement setup allows an even distribution of all temperature points
Experimental setup can also be used for animal experiments

Tasks

Investigate the effect of soil temperature on the germination of garden cress (Lepidium sativum)
Determine the most favourable value for the germination and growth of cress using a temperature organ.

Learning objectives

Plant germination
Temperature optimum/ maximum/ minimum
Soil temperature
Temperature preferendum

As the experiment lasts for several days, the use of a cold-heat circulator (cooling thermostat) is strongly recommended. A conventional circulator is not sufficient for the experiment.

Scope of delivery

Temperature organ	65983-93	1
Rubber hose, various diameters	39283-00	2
Lab thermometer,-10..+50C	38055-00	6
Petri dishes, glass, various diameters	64705-00	5
Circulation thermostat, temperature range -10°C ... RT	08495-93	1
Hose clamp for 8-12 mm diameter	41000-00	8
Rubber hose, various diameters	39290-00	1
Tubing connector, ID 6-10mm	47516-01	2