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Factors affecting the germination of seeds (Tolerance limits (pH, Water…
Factors affecting the germination of seeds
Tolerance limits
pH
Water availability
Temperature
Nutrients
Sunlight
NaCl concentration
Possible questions
How does pH affect the germination of seeds?
Pros
Direct relevance to tolerance limits
Easy to test
Cons
May change pH during testing
What effect does temperature have on the germination of seeds?
Pros
Can control temperature
Direct relation to tolerance limits
Cons
Need to remove from environment to measure
How does the volume of water available affect seed growth?
Pros
Easily measurable
Cons
Some seeds may get more than others in each test
What effect does sunlight have on the growth of seeds?
Pros
Easy set up
Cons
Not directly related to question
Difficult to measure
How does the presence of nutrients affect seed growth?
Pros
Can give measurable amounts
Many nutrients to choose from
Cons
Other nutrients may be present
What effect does salt have on the growth of seeds?
Pros
Easy to measure
Relevant to tolerance limits
Cons
May crystallize, not affecting seeds
Measuring techniques
Length of roots
Every root
Pros
Good indication of seed health
Cons
Very time consuming
Not practical
Main root
Cons
Not true indication
Main root curling
Pros
Easily measurable
Quick and definitive
Can measure both for overall seed health and growth
Length of sprout
Pros
Observe seed health
Cons
Not true growth indication
Swelling of seed
Pros
Easily observable
Cons
Difficult to measure diameter
Can only measure initially
Germination time
Pros
Easily measurable
Cons
Need to check constantly
Variables
Seeds
Radish
Ideal for winter conditions
Bean
Longer germination rate
Flower
Available
Temperature
Hot
Incubate
Cold
Refrigerate
Nutrients
Seed tube
Constant
Soil
Unknown levels of nutrients
Cotton wool
Act as soil with constant nutrient values
Sunlight
High
Outside
None
Window-less room
Medium
Indoors, shaded
Germination techniques
Soil
Advantages
Accurate growth conditions
Disadvantages
Unknown amounts of nutrients
Cannot measure root system
Paper towel tubes
Advantages
Can measure root system
Controllable growth conditions
Disadvantages
Middle tube will keep moisture
Cotton wool
Advantages
Controllable conditions of growth
Disadvantages
Cannot accurately measure root system