Increasing Plant Production. AS 91290 Demonstrate understanding of techniques used to modify physical factors of the environment for NZ plant production. Contents . THE BASICS Photosynthesis , respiration , transpiration , nutrient uptake , water uptake. Liebig’s Law of the Minimum
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Demonstrate understanding of techniques used to modify physical factors of the environment for NZ plant production
There are 6 key processes that happen inside a plant
Learn how to spell these!
Converting light energy to chemical energy
Using chemical energy to grow and function
Getting water from the roots to the leaves
Getting macro and micro nutrients into the plant
Getting water from the growing media into the roots
Light energy + chlorophyll
Water + Carbon Dioxide Glucose + Oxygen
H2O + CO2 C6H12O6 + O2
Is a chemical reaction occurring in the chloroplasts found inside plant cells
You do not need to learn the structure of chlorophyll
So why are plants green?
Chlorophyll does not absorb green light – instead it reflects green light and it bounces back off the plant into your eye and the plant (leaf) looks green.
So what colour light should plants be exposed to?
Oxygen + Glucose Water + Carbon Dioxide
O2 + C6H12O6 H2O + CO2
This energy is the useful output of respiration
The energy is released in respiration to ‘power’ other cell processes such as the formation of proteins and lipids
Summary diagram showing the relation- ship between photosynthesis and respiration
Carbon dioxide (CO2)is an essential component of photosynthesis (also called carbon assimilation). Photosynthesis is a chemical process that uses light energy to convert CO2 and water into sugars in green plants. These sugars are then used for growth within the plant, through respiration. The difference between the rate of photosynthesis and the rate of respiration is the basis for dry-matter accumulation (growth) in the plant.
The plant, through photosynthesis, fixes carbon dioxide and water in the form of sugars. The sugars are used in respiration to provide energy - breaking down again to carbon dioxide and water. Some sugars are synthesize into amino acids and finally proteins, the building blocks of living tissue.
The water level in the barrel represents plant growth.
By adding more light, Phosphorus, warmth etc there will be no further increase in growth.
What is the limiting factor?
Click here for explanation
shoot of a rose
Aphids sucking sap from cabbages
Mildew on growing tip
Plates 6b. Liquid CO2 tanks.
Liquid Carbon dioxide tank supplying a greenhouse.
Carbon dioxide generator for a large greenhouse (burns fossil fuels to generate CO2
Then give each a definition