Techniques to increase plant production. AS 90451 Describe physical factors of the environment and techniques used to modify them for plant production. Contents . In the previous PPT we covered PLANT PROCESSES ENVIRONMENTAL FACTORS AND PLANT G ROWTH TECHNIQUES
Describe physical factors of the environment and techniques used to modify them for plant production
In the previous PPT we covered
For example, young capsicum plants require optimum day and night-time temperatures of 25°C and 18–23ºC respectively.
Warmer temperatures in a hothouse increases insect activity, thus increasing pollination (fruit set).
Increased air temperature in the glasshouse increases the rate of photosynthesis, which produces more carbohydrates and speeds up the ripening process.Tomato hothouse
Ventilation reduces the chances of plant diseases, as it increases air movement, and reduces temperature and humidity. This ensures that fungal spores do not settle on leaves.
Bit of a tradeoff – do you open the vents to decrease humidity and decrease the temp. Or keep them closed to increase temp but risk too much humidity?
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
Could be in the form of:
YouTube- How a hail cannon works
Crop quality and quantity are affected by physical factors in a glasshouse.This photo is of an orchid glasshouse that is being used modify physical factors.
Explain how increasing carbon dioxide levels increases crop yield.
In your explanation:
• describe, by giving figures, the carbon dioxide levels before and after enrichment
• explain how plant growth is improved, leading to increased crop yield.