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B8.Summary (Geranium (PS Limiting factor: Temperature
Frost -…
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B8.Summary
Geranium
PS Limiting factor: Temperature
- Frost - indicates below 0°C ,
react rates slower in low temp
PS Limiting factor: Light Intensity
- Short day length, low intensity in winter,
light provides energy for endo. react.
Plant Glucose Production
- Energy for cell functions; growth; reproduction
- Build smaller molecules into bigger ones
- Starch convert for storage; Cellulose; Amino acids
- Build up fats & oils store in seeds
Pure Water Failure
- Plants need CO2, H2O, Light for PS (sugars)
Temp is unlikely limiting factor at room temp (20 °C)
- Plants need molecules for amino acids, to proteins
to chlorophyll for PS
- Requires NO3-, Mg(2+) ions from soil
- Pure water does not allow protein, chlorophyll production
Hydroponics
Benefits
- Eliminates limiting factors
- More PS takes place
Bigger Benefits
- Rice, potatoes, tomatoes, peas, cucumbers
- Have biggest % increases in yield
- Economically sound
Illegible Benefits
- Wheat and cabbage
- Relatively small incr. in yield
- Not cost effective
Plant
System
FAQ
- Where plants make food - leaves; green stems
- Where plants take water - roots
- PS - Starch test
- Perform Iodine test
on plants left in light for 24 hrs,
and on plant left in dark 24 hrs;
starch vs. no starch
- Boil leaves in ethanol -
destroy cuticle, remove colour
- Rinse in hot water (soften)
- Add Iodine solution
- Leaf in light changes blu-black for starch presence
- Leaf in dark remains yellow-brown, no starch
(Starch prod from PS;
dark leaves used up Starch in respir.)
Palm Oil
Tropical Conditions
- Good for PS, plenty of light, water, warm Temp
- Allow rapid PS, few limit factors
- Promote rapid growth
- Oil comes from Glucose from PS
Oil Purpose
- Energy store for dev'ing plant embryo
- For germination, growth before it can PS
- Glucose also for respiration - energy, growth
- Build complex carbs (cellulose, starch etc.)
- Combine NO3- for amino acids, to proteins
Natural
vs. Artificial
- Natural
- Relatively cheap, easy
- No specialist equipment
- Natural growing cycle
- Possible pests, weeds
- Weather dependant
- Limiting factors
- Artificial
- Max growth
- No limit factors
- Easy pest, weed control
- Grow out of season
- Clean crops on harvest
- Non-weather dependant
- Work indoors; better work
- High set-up cost
- Expensive to run
- Technological liability
Oak
Seedlings
Light Intensity Test
- Hi-er intensity = faster PS, food production, growth
- Light isn't limiting, CO2, Temp is possibly limiting
- Constant limit for plants in lo-er intensity
- PS slower, grow less