Thursday, 25 April 2013
5.1 describe how glasshouses and polythene tunnels can be used to increase the yield of certain crops
In glasshouses and polythene tunnels conditions can be controlled. This control means that all the limiting factors for plant growth can be set to the optimum conditions; this will result in more growth, so higher yield.
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how would humidity affect the rate of respiration?
ReplyDeletehow would this be controlled?
They burn fossil fuels, producing water vapour, which lowers rate of transpiration
DeleteIn glasshouses and polythene tunnels conditions can be controlled.
ReplyDeleteYou can control:
1. Temperature (artificial heaters / burning fossil fuels)
2. Carbon dioxide (burning fossil fuels)
3. Light (lamps - prolong days)
All of this increases the rate of photosynthesis.
More photosynthesis = More crops, so higher yield!
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adding yoghurt to crops increases the yield of the crop because the ph level of lactobacillus is the optimum ph for enzymes to work at.
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