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.

9 comments:

  1. how would humidity affect the rate of respiration?
    how would this be controlled?

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    Replies
    1. They burn fossil fuels, producing water vapour, which lowers rate of transpiration

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  2. In glasshouses and polythene tunnels conditions can be controlled.
    You 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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  3. This comment has been removed by the author.

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